33 results about "In situ infrared spectroscopy" patented technology

The invention relates to an ionic liquid system electrochemical process in-situ research device. According to the device, an in-situ photo-electrochemical tank is adopted as a core. Under the control and adjustment of a multifunctional automatic adjusting rack, devices such as a flow injection analyzer, an in-situ infrared spectrometer, a Raman spectrometer, a metallurgical microscope, a multi-channel electrochemical workstation, a quartz crystal microbalance, and the like can be applied in combination. Detection liquid is placed in the in-situ photo-electrochemical tank, and a reaction process is subjected to real-time monitoring by using a computer control system. With the device provided by the invention, on a basis of conventional electrochemical tests, morphology, structure, composition, concentration change characterizations upon electrode surface / interface sediment, electrolyte, decomposition products, gas product, and the like can be realized, and powerful support can be provided for ionic liquid electrochemical process researches. The device has the characteristics of compact structure, high operation automation degree, precise detection, reasonable design, and the like.

The invention relates to an in-situ infrared spectrum cell which comprises a closed cell body, wherein an infrared injecting port and an infrared ejecting port are oppositely formed in the cell body and are used for enabling infrared light to be transmitted in and penetrate through the cell body; a lighting port and a sample setting port are oppositely formed in the cell body further; the lighting port is used for enabling the light to be transmitted into the cell body and irradiated to a sample to be detected; a packaging structural body which is used for sealing the sample setting port is further arranged at the sample setting port. The packaging structural body further comprises a heating element and a temperature measuring element, wherein the heating element is used for directly heating the sample to be detected, and the temperature measuring element is used for collecting the temperature of the sample to be detected.

A high-pressure in-situ infrared spectroscopy apparatus for monitoring a supercritical system on line comprises a high-pressure reaction kettle, a controller, an infrared spectrometer and a computer, a sample intake valve and a three-way gas-liquid valve of the high-pressure reaction kettle communicate with a high-pressure injection pump, the high-pressure reaction kettle communicates with a metering pump through the sample intake valve and the three-way gas-liquid valve, communicates with a nitrogen cylinder and a vacuum pump through an exhaust valve and a three-way nitrogen valve and communicates with a pressure sensor through a pipeline, a temperature-measuring thermocouple which is connected with the temperature indicator of the controller through a wire is arranged on the high-pressure reaction kettle, a heater and a temperature-controlling thermocouple which are connected with the temperature controller of the controller through wires are arranged on the high-pressure reaction kettle, the pressure sensor is connected with the pressure indicator of the controller through a wire, and the infrared spectrometer is connected with the computer through a wire. The high-pressure in-situ infrared spectroscopy apparatus also comprises an electromagnetic agitator, an emission bin and an optical fiber, the electromagnetic agitator is arranged under the high-pressure reaction kettle and connected with the speed regulator of the controller, the emission bin is arranged on the infrared spectrometer, and the optical fiber is connected with the emission bin and an infrared sensor inserted into the high-pressure reaction kettle.

The invention provides a selective hydrogenation method of alkyne and alkadiene in a C4 hydrocarbon material flow. The method provided by the invention comprises the following steps of: adding the C4 hydrocarbon material flow containing alkyne and / or alkadiene and hydrogen gas into a hydrogenation reactor which is filled with a load type palladium catalyst; carrying out the selective hydrogenation on the alkyne and / or alkadiene in the C4 hydrocarbon material flow to form olefin when an inlet temperature is in a range of 10-80 DEG C, a mol ratio of the hydrogen gas to the sum of the alkyne and the alkadiene is 1-10 and a reaction pressure is in a range of 0.1-4 Mpa, and removing the olefin, wherein the load type palladium catalyst comprises a carrier, palladium and selective modified components; testing the load type palladium catalyst by utilizing a carbon monoxide adsorption in-situ infrared spectroscopy at the temperature of 40 DEG C to obtain an area ratio of a bridge type absorption peak at the 1930-1990cm<-1> to a bridge type absorption peak at the 1870-1930cm<-1> in an obtained infrared spectrogram is less than 0.2, more preferably less than 0.15. The method provided by the invention has a high selectivity to the selective hydrogenation of the alkyne and the alkadiene in the C4 hydrocarbon material flow and can be operated for a long period.

The invention provides a selective hydrogenation method of alkyne and dialkene in an alkene stream. The method comprises the steps that: an alkene stream containing alkyne and / or dialkene, and hydrogen are delivered into a hydrogenation reactor provided with a supported palladium catalyst; alkyne and / or dialkene in the alkene stream are hydrogenated into alkene under conditions of: a temperature in of 10 to 80 DEG C, a molar ratio of hydrogen to a total amount of alkyne and dialkene of 1 to 10, and a reaction pressure of 0.1 to 4 Mpa, such that alkyne and / or dialkene in the alkene stream are removed. The supported palladium catalyst comprises a carrier, palladium and optional modifying components. With a carbon monoxide adsorption in situ infrared spectroscopy method, the catalyst is tested under a temperature of 40 DEG C. In an obtained infrared spectrogram, an area ratio of an overhead absorption peak at a location of 1983 to 1990cm-1 to that at the location of 1870 to 1930cm-1 is lower than 0.2, and preferably 0.15. The method provides a high selectivity in the selective hydrogenation of alkyne and dialkene. The method can operate for a long period.

The invention relates to an in-situ dual infrared spectrum pool, which comprises a pool body, wherein a cover is respectively arranged on two ports of the pool body; each cover and the port are sealed by a seal ring; an infrared window is arranged on each cover; the lateral wall of the pool body is provided with two holes; a heating tape is coiled on the outer wall of the pool body; a cooling water system is respectively arranged on outer walls of two ends of the pool body; a sample bracket is fixed in the pool body; two sample cells are arranged on the sample bracket; and a thermocouple passes through the wall of the pool body and is in contact with the sample bracket. The in-situ dual infrared spectrum pool disclosed by the invention is suitable for monitoring adsorption of gases at high temperature and different pressures on the surface of a solid material, or reaction or phase change of the solid material per se.

The invention discloses a supported palladium catalyst with characteristic of specific infrared absorption, comprising a carrier, palladium and optional modifying component. For finding a noble metal catalyst with good catalytic performance accurately and effectively, the carbon monoxide adsorption in-situ infrared spectroscopy is used for testing the catalyst at the temperature of 40 DEG C, in the obtained infrared spectrum, the ratio of the area of a bridge type absorption peak at the value of 1930-1990 cm<-1> to the area of a bridge type absorption peak at the value of 1870-1930 cm<-1> is less than 0.2, and more preferably 0.15. In addition, preferably, the ratio of the peak height of an absorption peak at the value of 1870-1930 Cm<-1> in the in-situ infrared spectrogram obtained by testing the catalyst when being purged with nitrogen gas for 0 min to the peak height of an absorption peak at the value of 1800-1900 cm<-1> in the in-situ infrared spectrogram obtained by testing the catalyst when being purged with nitrogen gas for 15 min is less than 5, and more preferably 2. The catalyst has excellent reaction selectivity and activity, and the preparation method of the catalyst is easy to operate and saves energy.

The invention relates to an in-situ infrared spectrum pool for researching a gas-solid interface or a liquid-solid interface. The in-situ infrared spectrum pool comprises a pool body, wherein a gas or liquid inlet / outlet is formed at the upper end of the pool body; a thermoelectric coupler is inserted into the pool body from the upper end of the pool body; an opening is formed at the lower end of the pool body, and the pool body is connected with a base; an infrared crystal is arranged at a joint of the inner part of the base and the pool body; a sealing ring is arranged between the pool body and the infrared crystal; and a light inlet and a light outlet are formed on the base. By adoption of the in-situ infrared spectrum pool, the absorption, desorption and reaction of molecules of gas or liquid on the surface of a solid material can be researched in situ.

The invention discloses a high pressure in-situ infrared sample cell and an application thereof in a CO2-organic liquid system. The sample cell comprises a stainless steel shell. A through hole is arranged in the shell. Two ends of the through hole are encapsulated by infrared windows. The shell is provided with a sample inlet and a sample outlet, and the sample inlet and the sample outlet are communicated with the through hole. The high pressure in-situ infrared sample cell can be used to research the interaction rules of molecules in a CO2-organic liquid system under a high pressure state. Compared with a molecular dynamic simulation method, the molecular interaction rules of the CO2-organic liquid system under the influence of high pressure can be more vividly represented by the high pressure in-situ infrared spectroscopy. The provided high pressure in-situ infrared sample cell can be used to measure the in-situ infrared spectroscopy of a liquid system, a gas system, and a gas-liquid system under a high pressure condition; the highest pressure can reach 10 MPa, the operation is simple and convenient, the measured data is reliable, and the sample cell can be used to research themicroscopic interaction mechanism of components in a gas system, a liquid system, or a gas-liquid system.

The invention relates to a device and a method for non-equilibrium catalytic reaction of ethylamine. The device comprises a reactor, a static mixer, a controller, an in-situ infrared spectrometer, anethanol vaporizing chamber, an ammonia vaporization chamber, a first heat exchanger, a second heat exchanger, an automatic valve I, an automatic valve II and an automatic valve III. According to the method, online monitoring control is used for regulating and controlling a non-equilibrium reaction and an equilibrium reaction. After the device and the method are adopted, the proportion of ethylamine reaction products is adjusted, so that the market demand is met; the product circulation is reduced or eliminated, the energy consumption is reduced, and the by-products are reduced.

The invention relates to a moving compound type chemical reaction course measuring system which is a chemical reaction measurer. It can relate the solid-state reactant, the adsorbing molecular shape and the product, expand the qualitative or quantitative analysis of the stationary state product to the qualitative or quantitative analysis of the dynamic state product, can provide the structure change information of the molecule and be used in dynamic measuring to reaction principle research. It arranges a gas changer and a transformation infrared spectrometer and adopts home position infrared spectrum example pool; it also arranges at least one of the chromatogram or mass analyzer; the sample input end of the gas changer is connected with the sample; the exhaust pipe of the gas changer is connected with the gas inlet port of the home position infrared spectrum example pool; the reaction product port of the home position infrared spectrum example pool is connected with the chromatogram or mass analyzer.

The invention provides an in-situ infrared spectrum reaction device in a free radical shower atmosphere. The in-situ infrared spectrum reaction device comprises a shell, a nozzle electrode, an observing window, two infrared optical path windows, a reaction tank main body, a polar plate and a first cable; a closed cavity is formed in the shell; one end of the nozzle electrode extends into the closed cavity from the top of the upper shell, the other end of the nozzle electrode is located outside the upper shell, electrode gas is introduced, and the nozzle electrode is connected with a high-voltage power supply; both the observing window and the two infrared optical path windows are arranged on the upper shell; the reaction tank main body is arranged in the closed cavity, a first groove is formed in the top of the reaction tank main body, a gap is formed between the reaction tank main body and the inner wall of the lower shell so as to form a gas channel surrounding the periphery of the reaction tank; the polar plate is arranged in the first groove and is located below one end of the nozzle electrode; one end of the first cable extends into the lower shell and is connected with the polar plate, and the other end of the first cable is grounded, wherein the lower shell is provided with two air pipe connectors which are respectively connected with an air inlet pipe and an air outletpipe. According to the in-situ infrared spectrum reaction device in the invention, the problem that the existing infrared spectrum detection technology is difficult to meet catalytic reaction characterization that active particles participates in is solved.

A method for analyzing conformation and crystal-form of polymer in supercritical environment at home position includes setting said polymer in home position Fourier transform infrared spectrum with high pressure infrared pool, injecting supercritical fluid into said pool to carry out home position measurement of infrared spectrogram for polymer, measuring out conformation and crystal-form variation in acting to each other procedure of polymer with supercritical carbon dioxide by carrying out analysis on infrared spectrogram.

The invention provides a double-channel in-situ infrared reaction tank, which comprises a tank body, which a sample groove is formed in the bottom end of the tank body, a sample table is clamped in the sample groove, a clamping groove used for fixing a sample is formed in the top surface of the sample table, and a through hole allowing infrared light to penetrate through is formed in the bottom part of the clamping groove; a first window, a second window and a third window are formed in the side wall of the tank body; a first window sheet and a second window sheet which can transmit infrared light are respectively arranged in the first window and the second window; a third window sheet which can transmit sunlight is arranged in the third window; a gas input pipeline and a gas output pipeline which are communicated with the interior of the pool body are arranged on the pool body; and a reference electrode and a counter electrode are arranged at the top end of the pool body. According tothe double-channel in-situ infrared reaction tank, the first window and the second window are arranged to realize the external reflection channel, and the through holes are formed to realize the internal reflection channel, so that internal reflection and external reflection double-channel light paths are formed, and the in-situ infrared spectrum characterization of liquid-phase species and interface species of the photocatalytic reaction is realized.

The invention provides a novel goethite / water interface amino acid microstructure and adsorption action mechanism research method. According to the method, an in-situ infrared spectroscopy ATR flow cell technology and a DFT theoretical calculation means are combined to be used, the influences of amino acid molecular structures, pH value, ion strength and other factors on the micro-interface process can be illuminated, and the adsorption kinetics process of the molecular level is disclosed. According to the infrared spectroscopy ATR flow cell technology, the adsorption processes of amino acids can be monitored in situ, and interface information is subjected to on-line enrichment. According to the DFT theoretical calculation, the infrared frequency values of amino acid forms before and after adsorption can be simulated, the peak identification is performed, and the micro-interface structure is further determined. The method disclosed by the invention can provide direct experimental evidence and theoretical basis for determining the micro-interface structure and an adsorption action mechanism of the goethite / water interface amino acids.

The invention discloses an in-situ infrared spectrum sample tabletting device and an application thereof. The in-situ infrared spectrum sample tabletting device comprises a pedestal, a sleeve, a pad,a cover plate and a pressure head; the top of the pedestal is in a boss structure, the top of the sleeve is opened, the bottom is in a groove structure, the bottom of the groove structure is in a hollow structure, the groove of the sleeve is arranged at a boss of the pedestal, the pad and the bare surface of a boss of the pedestal are superposed, the cover plate is placed at the top of the sleeve,a center of the cover plate is in the hollow structure, a filtering medium is arranged in the hollow structure, the hollow structure faces to a port at the top of the sleeve, an air inlet pipe is arranged at an upper part of the sleeve, the air inlet pipe horizontally passes through one sidewall of the sleeve, and the air inlet pipe in the sleeve is introduced into a sample bin along a tangent direction of a circle cross section of the sample bin. The device is used during a sample tabletting process, uniform and complete sample compressed tablets can be obtained, and the in-situ infrared spectrum sample tabletting device is convenient for increasing work efficiency and result accuracy.

The invention discloses a method for studying a coal spontaneous combustion mechanism based on ultrasonic extraction, and belongs to the technical field of coal spontaneous combustion research methods. The method comprises the following steps that a coal sample is pretreated; the coal sample is subjected to ultrasonic extraction; an extract obtained through the extraction is subjected to the detection of an infrared spectrum, a paramagnetic resonance spectrum and a fluorescence spectrum, and the original coal sample and a coal residue obtained through the extraction are subjected to TG / DSC-FIRE-GC / MS combination, in-situ infrared spectrum analysis and free radical dynamic in-situ analysis; Gaussian 09 is used for establishing active molecule structure models of the extract, original coal sample and coal residue, and transition state characteristics of an reactive oxidation reaction process are studied through the analysis of structural characteristics, charge distribution, reaction activity positions, vibrational characteristics of reaction positions, orbits and the like of the molecular structure models. The method for studying the coal spontaneous combustion based on the ultrasonic extraction has important scientific and practical significance for revealing the coal spontaneous combustion mechanism, developing novel coal spontaneous combustion inhibitors and guiding agents, and guiding on-site fire fighting work.

The invention discloses a sample stretching device for in-situ infrared spectroscopic analysis. The sample stretching device comprises a shell, a cavity is arranged in the shell, and a sample placingmodule and an extrusion module are also arranged on the shell; a first through hole penetrating the shell is formed in the shell; the sample placing module is used for mounting and fixing a to-be-tested sample in the shell, and the sample directly faces the first through hole of the shell after being mounted and fixed; and the extrusion module is used for extruding the sample mounted and fixed onthe sample placement module. The device provided by the invention can achieve bidirectional stretching simulation of a sample film and in-situ infrared measurement at the same time, does not need to repeatedly take down a sample from extrusion equipment and then install the sample, simplifies the detection process of obtaining spectral data, and improves the working efficiency of sample detection.The device is simple in structure and easy to implement.

The invention discloses an in-situ infrared spectrum sample tablet pressing device and its application. The in-situ infrared spectrum tablet pressing device includes a base, a sleeve, a gasket, a cover plate and an indenter; the top of the base is a boss structure, and the sleeve The top is open, the bottom is a groove structure, the bottom of the groove structure is hollow, the groove of the sleeve is installed on the boss of the base, the gasket coincides with the exposed surface of the boss of the base, the cover plate is placed on the top of the sleeve, and the cover plate The center is a hollow structure, the hollow structure is equipped with a filter medium, and the hollow structure is facing the opening of the top of the sleeve; the upper part of the sleeve is provided with an air inlet pipe, and the air inlet pipe runs through one side of the sleeve horizontally, and the air inlet pipe inside the sleeve is along the sample chamber. The tangential direction of the circular cross-section enters the sample chamber. The device is applied in the sample pressing process, and can obtain uniform and complete sample pressing, which is convenient for improving work efficiency and result accuracy.

The invention belongs to the field of lithium battery testing, and in particular relates to a method for quickly optimizing the formula of a lithium ion battery electrolyte, comprising the following steps: step 1: preparing a lithium ion battery electrolyte according to an existing formula; step 2: assembling a simple battery; Step 3: Carry out the charge-discharge cycle test of the simple battery, and at the same time maintain a certain number of cycle intervals for infrared spectrum testing to observe the consumption speed of various additives in the electrolyte and the change in battery capacity. The present invention provides a method of inferring the consumption rate of various additives and quickly optimizing the formula of the electrolyte by observing the in-situ infrared spectrum changes of the electrolyte during the cycle without making a finished battery and without long-term circulation. method.

The invention provides a selective hydrogenation method of alkyne and alkadiene in a C4 hydrocarbon material flow. The method provided by the invention comprises the following steps of: adding the C4 hydrocarbon material flow containing alkyne and / or alkadiene and hydrogen gas into a hydrogenation reactor which is filled with a load type palladium catalyst; carrying out the selective hydrogenation on the alkyne and / or alkadiene in the C4 hydrocarbon material flow to form olefin when an inlet temperature is in a range of 10-80 DEG C, a mol ratio of the hydrogen gas to the sum of the alkyne and the alkadiene is 1-10 and a reaction pressure is in a range of 0.1-4 Mpa, and removing the olefin, wherein the load type palladium catalyst comprises a carrier, palladium and selective modified components; testing the load type palladium catalyst by utilizing a carbon monoxide adsorption in-situ infrared spectroscopy at the temperature of 40 DEG C to obtain an area ratio of a bridge type absorption peak at the 1930-1990cm<-1> to a bridge type absorption peak at the 1870-1930cm<-1> in an obtained infrared spectrogram is less than 0.2, more preferably less than 0.15. The method provided by the invention has a high selectivity to the selective hydrogenation of the alkyne and the alkadiene in the C4 hydrocarbon material flow and can be operated for a long period.

The invention discloses an in-situ infrared ATR test method of a thermal color phase change thin film material. An in-situ sample table comprises a base, a cooling box, a rapid temperature changing module, a sample table body and a heat preservation upper cover, the base is provided with a heat insulation concave part, the cooling box is arranged in the concave part, a cooling water pipe is arranged on one side of the cooling box, and the rapid temperature changing module is tightly arranged over the cooling box; and the sample table is arranged above the rapid temperature changing module in a manner of sealing the concave part, the sample table is provided with a sample groove for placing a sample, and a heat preservation upper cover is arranged at the top of the sample table. According to the testing method provided by the invention, a new function of in-situ infrared spectrum characterization of the whole phase change process of the thermal hue phase change thin film material under different temperature conditions is realized; and the method has the advantages of simple operation, no need of sample preparation and pretreatment, maintenance of the integrity of the sample morphology, avoidance of the influence of a film substrate, and good data reproducibility.

The invention discloses a high pressure in-situ infrared sample cell and an application thereof in a CO2-organic liquid system. The sample cell comprises a stainless steel shell. A through hole is arranged in the shell. Two ends of the through hole are encapsulated by infrared windows. The shell is provided with a sample inlet and a sample outlet, and the sample inlet and the sample outlet are communicated with the through hole. The high pressure in-situ infrared sample cell can be used to research the interaction rules of molecules in a CO2-organic liquid system under a high pressure state. Compared with a molecular dynamic simulation method, the molecular interaction rules of the CO2-organic liquid system under the influence of high pressure can be more vividly represented by the high pressure in-situ infrared spectroscopy. The provided high pressure in-situ infrared sample cell can be used to measure the in-situ infrared spectroscopy of a liquid system, a gas system, and a gas-liquid system under a high pressure condition; the highest pressure can reach 10 MPa, the operation is simple and convenient, the measured data is reliable, and the sample cell can be used to research themicroscopic interaction mechanism of components in a gas system, a liquid system, or a gas-liquid system.

A high-pressure in-situ infrared spectroscopy apparatus for monitoring a supercritical system on line comprises a high-pressure reaction kettle, a controller, an infrared spectrometer and a computer, a sample intake valve and a three-way gas-liquid valve of the high-pressure reaction kettle communicate with a high-pressure injection pump, the high-pressure reaction kettle communicates with a metering pump through the sample intake valve and the three-way gas-liquid valve, communicates with a nitrogen cylinder and a vacuum pump through an exhaust valve and a three-way nitrogen valve and communicates with a pressure sensor through a pipeline, a temperature-measuring thermocouple which is connected with the temperature indicator of the controller through a wire is arranged on the high-pressure reaction kettle, a heater and a temperature-controlling thermocouple which are connected with the temperature controller of the controller through wires are arranged on the high-pressure reaction kettle, the pressure sensor is connected with the pressure indicator of the controller through a wire, and the infrared spectrometer is connected with the computer through a wire. The high-pressure in-situ infrared spectroscopy apparatus also comprises an electromagnetic agitator, an emission bin and an optical fiber, the electromagnetic agitator is arranged under the high-pressure reaction kettle and connected with the speed regulator of the controller, the emission bin is arranged on the infrared spectrometer, and the optical fiber is connected with the emission bin and an infrared sensor inserted into the high-pressure reaction kettle.

An in situ infrared spectrum pool for studying a gas-liquid-solid three-phase boundary comprises a pool body with openings at two ends. A top cover is arranged at the upper end of the pool body, a base is arranged at the lower end of the pool body, a sealing ring is arranged between the top cover and an upper end port of the pool body, and a sealing ring is arranged between the base and the pool body. The in situ infrared spectrum pool is characterized in that the top cover is provided with a gas inlet pipe and a gas outlet pipe communicated with the pool body, the base is hollow and provided with infrared crystal, a hollow sealing gasket is arranged between the infrared crystal and the base, a thermocouple penetrates through the top cover to extend into the pool body, and a heating belt surrounds an outer wall of the pool body. The in situ infrared spectrum pool can enable users to study adsorption, desorption and reaction which occur on the gas-liquid-solid three-phase boundary.

The invention relates to an in-situ infrared spectrum cell which comprises a closed cell body, wherein an infrared injecting port and an infrared ejecting port are oppositely formed in the cell body and are used for enabling infrared light to be transmitted in and penetrate through the cell body; a lighting port and a sample setting port are oppositely formed in the cell body further; the lighting port is used for enabling the light to be transmitted into the cell body and irradiated to a sample to be detected; a packaging structural body which is used for sealing the sample setting port is further arranged at the sample setting port. The packaging structural body further comprises a heating element and a temperature measuring element, wherein the heating element is used for directly heating the sample to be detected, and the temperature measuring element is used for collecting the temperature of the sample to be detected.

The invention discloses a sample stretching device for in-situ infrared spectrum analysis, which comprises a casing, a cavity is arranged inside the casing, and a sample placement module and an extrusion module are also arranged on the casing; the casing The body is provided with a first through hole through the housing; the sample placement module is used to install and fix the sample to be tested inside the housing, and the sample is installed and fixed to face the housing. a first through hole; the extruding module is used to extrude the sample installed and fixed on the sample placing module. The device of the present invention can realize the biaxial stretching simulation of the sample film and the in-situ infrared measurement at the same time, without repeatedly removing and reinstalling the sample from the extrusion equipment, simplifying the detection process of obtaining spectral data, and improving the work of sample detection efficiency. The device of the invention has simple structure and is easy to realize.

The invention provides a selective hydrogenation method of alkyne in a C4 hydrocarbon stream. The selective hydrogenation method comprises the steps of introducing the C4 hydrocarbon stream containing alkyne together with hydrogen into a hydrocarbon reactor with a supported palladium catalyst, carrying out selective hydrocarbon on alkyne in the C4 hydrocarbon stream at the inlet temperature of 10-80 DEG C in a molar ratio of hydrogen to alkyne of 1-10 at the reaction pressure of 0.1-4MPa so as to form olefin / alkadiene, then removing alkyne, wherein the supported palladium catalyst comprises a carrier, palladium and a selectable modified component. In the invention, a carbon monoxide absorption in situ infrared spectroscopy is used so as to test olefin / alkadiene at the temperature of 40 DEG C, and in the obtained infrared spectrogram, the area ratio of bridge type absorption peak at the part of 1930-1990cm<-1> to bridge type absorption peak at the part of 1870-1930cm<-1> is less than 0.2, more preferably 0.15. The method has high selectivity on the selective hydrogenation of alkyne in the C4 hydrocarbon stream and can operate for a long period.