92results about How to "Low conversion temperature" patented technology

The invention provides a magnetic bead process nucleic acid extraction and transformation kit, and a using method thereof. The kit includes a lysate, a protease K, a magnetic bead solution, a transforamtion reagent, a nucleic acid protection agent, a binding solution, a washing solution I, a washing solution II and an eluent. The using method of the kit includes the following steps: (1) lysis; (2)transformation; (3) layering; (4) binding; (5) primary washing; (6) secondary washing; (7) drying; and 8) elution. The kit and the using method thereby can complete the transformation while achievingautomatic extraction of nucleic acid from a sample. The sample is lysed, releases the nucleic acid, and then begins to transform, the nucleic acid is separated from proteins by the binding solution after the transformation is completed, the methylated nucleic acid is purified by a magnetic bead process, and a pre-denaturation step in subsequent qPCR detection of the sample is used to replace a previously omitted sulfo group removal step, so a purification process in the original nucleic acid extraction step is omitted in the entire extraction and transformation process.

The invention discloses a method for preparing titanium carbide micro powder. Titanium powder and sucrose with the mass ratio of 1 to 1.6:1 are mixed, milled with balls, dried, then carbonized in boiling oil, dried, removed with oil and ignited, and then an auto-igniting reaction happens and titanium carbide is produced. The method mainly utilizes the sucrose to cover titanium powder particles, then carbonization is carried out to generate carbon which is used for covering the titanium powder particles; the contact area between carbon and titanium is fairly large and a carbon layer is remained between the titanium powder particles and particles, therefore, during the auto-igniting reaction, the carbonized titanium powder is not easy to agglomerate and the technique process is simple and easy to be controlled.

The invention discloses Ce:YAG glass ceramic as well as a preparation method and an application thereof. The Ce:YAG glass ceramic is prepared by active ingredients SiO2, B2O3, PbO, ZnO and Ce: YAG fluorescent powder, and on the basis of the SiO2, B2O3, PbO and ZnO, the content of each active ingredient is as follows (by molar fraction or mass fraction): 2 to 20 percent of SiO2, 10 to 35 percent of B2O3, 20 to 50 percent of PbO, 5 to 15 percent of ZnO and 2 to 10 percent of Ce:YAG fluorescent powder. According to the prepared Ce: YAG glass ceramic, the Ce: YAG microcrystal particles are uniformly distributed in the glass, so that the Ce:YAG glass ceramic has advantages of high transparency, low cost, excellent optical performance and the like. The invention also provides an application of the Ce:YAG glass ceramic in preparing a white-light LED (light emitting diode) device. By adopting the Ce:YAG glass ceramic, the sealing structure of the white-light LED device can be optimized, the process is simplified, and the lighting effect is improved.

The present invention discloses a silicon carbide aerogel, which is prepared from polycarbosilane containing Si-H bond, divinylbenzene, a Pt catalyst and an organic solvent by a polymer precursor conversion ceramic preparation method and aerogel preparation method. The silicon carbide aerogel has a specific surface area of 50-400 m<2> / g, a porosity of 70-90% and density of 0.1-0.2 g / mL; the mass ratio of polycarbosilane to divinylbenzene is 1:08-1.2; and the Pt catalyst accounts for 0.1-0.5% of the total weight of polycarbosilane and divinylbenzene. The method utilizes polymer precursor conversion ceramic preparation method for preparation of SiC aerogel, and the conversion temperature is as low as 800 DEG C. The obtained SiC aerogel has low oxygen content, high purity, good quality, and controllable porosity and density; and the process is simple and controllable.

The invention relates to a preparation method and applications of a monolithic catalyst used for catalyzing and purifying ammonia-containing waste gas. The monolithic catalyst consists of two parts, namely a honeycomb-shaped metal wiremesh carrier and a catalytic active component, wherein the honeycomb-shaped metal wiremesh carrier material is a FeCrAl stainless steel wiremesh; and the catalytic active component consists of a metal active component and an inorganic oxide carrier; the metal active component is one or more of Ag, Cu, Fe and Mn; and the inorganic oxide carrier is one or more of Al2O3, TiO2, SiO2, ZrO2 and CeO2. The monolithic catalyst has a three-dimensional permeating structure and properties such as higher heat transfer coefficient and mass transfer coefficient and lower pressure drop, is suitable for the installations of various reactors and can be directly applied in the industrial field. For example, the Ag / Al2O3 honeycomb-shaped metal wiremesh catalyst can be used for completely converting NH3 at 220 DEG C and have higher selectivity to N2 (>80%); and the catalyst has high stability and wide operating temperature window and is insensitive to the change of space velocity.

The present invention relates to a preparation method of a monolithic BEA molecular sieve catalyst for direct N2O catalysis decomposition. According to the monolithic BEA molecular sieve catalyst, cordierite is adopted as a carrier, a Fe and Co metal ion modified BEA molecular sieve is adopted as an active component, and a silica sol and an alumina sol are adopted to load the modified BEA molecular sieve on the cordierite to prepare the monolithic catalyst, wherein a ratio of the silica sol to the alumina sol is adjusted and the silica sol, the alumina sol and the modified molecular sieve are subjected to the optimal activity matching during the preparation process so as to prepare the high activity monolithic catalyst. Research results show that under reaction conditions of an airspeed of 4000 hour<-1> and a ratio of He to N2O of 65:35, the monolithic catalyst formed by matching the Co-BEA and 5% silica sol has the optimal activity, and the monolithic catalyst formed by matching the Fe-BEA and 5% alumina sol has the inferior activity. The monolithic BEA molecular sieve catalyst prepared by the preparation method has good catalytic activity and thermal stability, wherein a N2O conversion rate is 100% at a temperature of 500 DEG C.

The invention relates to a Pd / MIL-53(Al) catalyst, preparation and application thereof. The preparation method includes: letting terephthalic acid, aluminum nitrate and deionized water in a mass ratio of 1:5:20-30 react, conducting natural cooling to room temperature, and carrying out filtering and drying to obtain MIL-53(Al); and performing roasting to obtain a high specific surface area carrier, adding palladium nitrate, and conducting equivalent-volume impregnation to obtain a mixed solution, carrying out drying, and introducing Ar / H2 (0.1-0.2L / min) to conduct reduction activation so as to obtain the Pd / MIL-53(Al) catalyst. The loading capacity of palladium is 1-8wt%; the structural formula of MIL-53(Al) is [Al(OH)(O2C-C6H4-CO2)]. The catalyst is suitable for catalytic elimination of CO in catalytic cracking catalyst regeneration device discharged flue gas and motor vehicle exhaust, and has the advantages of large specific surface area, uniform distribution of active components, high catalytic activity, high thermal stability, easy synthesis, reduction of CO catalytic conversion temperature, and low consumption of precious metals.

The invention relates to a preparation method for a cerium-zirconium-palladium nanopowder catalyst. The preparation method comprises the following steps: dissolving a cerium source and a zirconium source in absolute ethanol, and adding P123 template agent to obtain sol; adding palladium nitrate; keeping constant temperature of 35DEG C and constant relative humidity of 40 percent, and performing evaporation induction to form gel; drying at the temperature of 100DEG C; calcining at the temperature of 400DEG C for 4 hours at the temperature rise rate of 1DEG C per minute; and ensuring that the atomic mole ration of cerium to zirconium is 8:2, the palladium loading quantity is 0.1 to 5 weight percent, and a ratio of the cerium source and the zirconium source to the absolute ethanol to the P123 is 10mmol:20ml:1g. The catalyst is suitable for catalytic elimination of CO in flue gas discharged by a catalytic cracking catalyst regeneration device and Co in tail gas of motor vehicles and has the advantages of large specific surface area, uniform distribution of noble metal active ingredients, high catalytic activity and thermal stability, and simple synthesis method; the temperature for complete catalytic conversion of CO can be greatly reduced; the consumption of noble metals is reduced; and the cost of the catalyst is reduced.

The invention discloses a three-way catalyst for purifying and treating lean-burn engine tail gas and a preparation method thereof. The catalyst comprises the oxides of zirconium, cerium and copper. The mol ratio of the three oxides is 0-20:0-2.5:1, wherein, the sum of the mole numbers of the oxides of the cerium and the zirconium is more than 80% of the mole number of the oxide of the copper. Water soluble zircon salt, cerium salt, copper salt and lanthanum salt form water solution composition. After citric acid is added and hartshorn is dropwise added, the solid is parched and roasted, and the catalyst is gained. The catalyst obviously reduces the conversion temperature of NO, HC and CO and has a three-way catalytic and purifying effect. The catalyst can completely desorb the CO in simulated lean-burn engine tail gas at a temperature above 200 DEG C and completely desorb NO, HC and CO at a temperature below 300-350 DEG C, can be used in an exhaust system of a lean-burn engine to eliminate the environmental pollutions of NO, HC and CO.

The invention provides a catalyst for catalytic combustion of VOCs and a preparation method and application thereof, and belongs to the field of catalyst preparation. The invention particularly provides a core-shell type catalyst which is formed by covering, with a SiO2 shell, a catalyst taking a sulfuric acid modified TiO2-CeO2 composite oxide as a carrier and loaded with noble metal ruthenium oxide and / or transition metal vanadium oxide as active components. The CeO2 has good oxygen mobility and can significantly enhance the oxidation-reduction performance of the catalyst, so that the catalyst has efficient VOC catalytic oxidation activity; the carrier is soaked in sulfuric acid; the surface acidity is enhanced to inhibit adsorption of acidic impurity components such as SO2, HCl and H2S,the active components RuO2 and V2O5 also have sulfur resistance, so that the sulfur poisoning resistance of the catalyst is remarkably improved, the silicon shell can inhibit contact between chlorideand the active components, and inactivation of the active components of the catalyst due to chlorine poisoning is avoided; or honeycomb ceramic can be used as a matrix to prepare a coated type catalyst.

The invention discloses a method for preparing porous nanometer graphite and belongs to the field of research on nanometer carbon materials. The method comprises the following main steps: preparing a water-soluble carbon source as a raw material, an auxiliary agent and iron salts according to an appropriate ratio into a solution and heating; evaporating, concentrating and reacting the solution to obtain carbon-containing precursor powder, reacting the precursor for 0.5-5 hours at 600-1300 DEG C under a certain atmosphere to obtain a reaction product, and washing the reaction product with acid to obtain porous nanometer graphite. The method is simple in operation and low in cost and is conductive to industrial production; the obtained product is high in degree of graphitization, has a porous structure and can be widely applied in such fields as lithium ion cells, field emission materials and super capacitors.

The invention provides a method for preparing high carbon hydrocarbon through photocatalytic activation of biomethane. The method comprises the steps that a biomethane CO2 removing system, an air pump, a preheater and multiple stages of parallel photocatalytic activation reactors are included, and unconverted methane mixture gas is used circularly and repeatedly; hydrogen generated in a photocatalytic activation reaction is permeated through a palladium hydrogen permeation membrane separator and recycled through a hydrogen vacuum pump, methane, ethane, ethylene, propane and butane are impermeable, high carbon hydrocarbon is recycled through a condensation cooler and a gas separator, uncondensed gas and methane are merged and return to a reaction system. According to the method, the hydrogen byproduct can be recycled, due to the fact that a multi-stage parallel photocatalytic activation inducing reaction is adopted, the staying time of membrane is prolonged, the conversion rate of membrane is increased, generation of ethane, ethylene, propane and butane in the reaction system is promoted, the alkanes serve as a reaction auxiliary of membrane and an initiator of optical free radical chains to be used circularly and repeatedly, therefore, the temperature of the reaction for converting membrane into high carbon hydrocarbon is significantly lowered, energy resources are saved, and the production cost of high carbon hydrocarbon is reduced.

A process for preparing the high-purity powder of nano-class alumina fibres includes dissolving HV-1 catalyst in distilled water, adding inorganic acid while slight heating for dissolving, immersing metal aluminium in it for 1-30 min in order to activate it, flushing with distilled water, blowing compressed air onto its surface for several hr to generate nano-class alumina fibres, collecting the fibres, and calcining at 500 deg.C for 0.5-5 hr to evaporate catalyst.

The invention discloses intermediate infrared optical glass for fine molding and molding. The intermediate infrared optical glass comprises the following components by molar ratio: 40-80% of GeS2, 5-40% of Ga2S3, 1-15% of La2S3 and 1-20% of Sb2S3. The intermediate infrared optical glass disclosed by the invention has a wide infrared transmission range, good glass-forming ability, simple preparation process, high refractive index, high mechanical strength and low glass transition temperature, and does not contain any ingredients adverse to the environment and the mold, such as lead, arsenic, fluorine, chromium and the like.

The invention provides a low temperature glass phosphor, comprising a low temperature glass material and a fluorescent powder, wherein the low temperature glass material is composed of silica (SiO2), alumina (Al2O3) and sodium oxide (Na2O) of a soda glass system, or is composed of phosphoric pentoxide (P2O5), tin oxide (SnO) and barium oxide (BaO) of a phosphatic glass system. The invention further provides a method for preparing the low temperature glass phosphor, comprising: a penetrated low temperature sintering step, a water quenching forming step, a grinding step, a mixing pre-burning step, a mixing grinding step and a hot pressing forming step. The low temperature glass phosphor can reduces glass conversion temperature, glass softening temperature and glass initial crystallization temperature, and can form optical glass according with a grade requirement for a white light LED module.

The present invention belongs to a gas-phase reaction catalyst and its preparation technique. In particular, it relates to a catalyst Fe2O3 for CO oxidation reaction and its preparation method. The matter phase of said catalyst is alpha-Fe2O3, its microstructure is nano line which contains 10-20 nano mesopore and whose outer diameter is 40-60 nano. Besides, said invention also provides the concrete steps of its preparation technique.

An amorphous copolyester is synthesized by diacid monomer and glycol monomer. The amorphous copolyester comprises a structure that is shown in Formula (1), wherein, the diacid monomer comprises TPA and the glycol monomer comprises EG. In addition, the glycol monomer also comprises 1, 3 / 1, 4-CHDM. When the adding amount of the 1, 3 / 1, 4-CHDM is 20-100molar percent of the glycol monomer, the amorphous copolyester is then obtained.

The invention relates to a method for preparing aromatic hydrocarbons by methane-plasma-activated oxygen-free aromatization. The method comprises a multistage-series plasma activation reactor, an aromatization reactor, a palladium hydrogen permeation membrane separator, a condensation cooler, a heat recovery device and a gas-liquid separator. Unconverted methane in the reaction system is recycled; hydrogen permeated by the palladium hydrogen permeation membrane separator is recovered through a hydrogen vacuum pump; the unpermeated ethane, acetylene, propane, butane and aromatic hydrocarbons pass through the condenser and gas-liquid separator to recover the liquid aromatic hydrocarbons; and uncondensed ethane, acetylene, propane, butane and methane are merged and return to the reaction system. The method can recover the coproduct hydrogen; the plasma is adopted to activate and induce the reaction, thereby enhancing the methane conversion rate and promoting the generation of small-molecular paraffin hydrocarbons in the reaction system; and the paraffin hydrocarbons can be recycled as a methane reaction aid and a free radical chain initiator, thereby greatly enhancing the methane aromatization selectivity and yield, reducing the carbon deposit and lowering the production cost of aromatic hydrocarbons.

The invention discloses a preparation method for a one-step synthetic multilayer nanometer box-shaped CuO-CeO2 catalyst for CO preferential oxidation reaction in hydrogen-rich gas. The catalyst is composed of a plurality of layers of homocentric-square-shaped nanometer box structures which are composed of nanometer CuO and CeO2, triblock copolymer serves as a template, cupric nitrate and cerium nitrate serve as raw materials, and a simple one-step method is adopted to synthesize the catalyst. The multiple layers of cavity structures of the prepared catalyst expose more CuO contact interfaces and CeO2 contact interfaces, and therefore more active sites are provided for the CO preferential oxidation reaction. The catalyst with the special features has good performance that CO complete conversion is achieved at the low temperature, and wide temperature windows with CO being completely converted exist.

The invention relates to variable-scale CeO2 and CuO composite mesoporous spheres with high specific surface area and a preparation method of the composite mesoporous spheres. The composite mesoporousspheres have low-temperature and high-efficiency catalytic oxidation activity on CO. The preparation method of the CeO2 / CuO composite mesoporous spheres comprise steps as follows: (1) firstly, variable-scale CeO2 mesoporous spheres are obtained by adopting Ce(NO3)3 as a Ce source in a C2H6O2 solution and regulating the water content; (2) the CeO2 / CuO composite mesoporous spheres are obtained fromCu(NO3)2 as a Cu source, Na2CO3 as a pH regulator and the variable-scale CeO2 mesoporous spheres as carriers with a precipitation-deposition-calcination method. The method has the advantages of beingsimple in process, easy to operate, low in cost and the like; the mesoporous spheres are very suitable for industrial large-scale production and preparation. The obtained CeO2 and CuO composite mesoporous spheres have the advantages that the scale can be effectively regulated in the range of 30-150 nm, and the specific surface area is 100-200 m<2> / g, have the characteristics of being low in complete conversion temperature for catalytic oxidation of CO, high in efficiency, long in service life and the like, and have significant application value in catalytic oxidation of CO, purification of automobile exhaust gas and industrial exhaust gas and the like in the future.

The invention relates to a ZSM-5 zeolite catalyst for preparing propylene from methanol (MTP), a preparation method and a regeneration method thereof. In the preparation method, commercially available ZSM-5 zeolite powder is utilized as a base material, wherein, the framework Si-Al mol ratio is more than 300, and the crystal size is 200-800nm; and aluminum sol is adopted for modification at a certain temperature so as to adjust the property of solid acid of ZSM-5 zeolite to adapt to MTP catalytic reaction. By means of the methods, the catalyst has the advantages of greatly improved stability,greatly improved single-pass life up to over 1000 hours, greatly improved renewability and excellent property on the premise of keeping high propylene selectivity of the ZSM-5 zeolite with high Si-Almol ratio, wherein, the catalyst can be regenerated for more than 7 times; and industrial crude methanol with mass concentration of 90% is utilized as a reacting raw material.

The invention relates to the technical field of carbon dioxide emission reduction and carbon dioxide conversion, in particular to a preparation method of remote explosionproof high-power plasma catalyzed carbon dioxide. The preparation method comprises the following steps of: with carbon dioxide and coal as raw materials, preparing a great deal of combustible carbon monoxide gas at a low price in the industry under the synergic action of high-power plasma, an activating agent and a catalyst; and combusting the carbon monoxide to generate the carbon dioxide which can be gathered and recycled. The preparation method disclosed by the invention has the advantages of remarkably reducing the carbon dioxide conversion temperature, improving the carbon dioxide convertion rate, being energy-saving and environment-friendly, saving fire coal by 10-85 percent, realizing near zero emission of the carbon dioxide, being low in equipment investment and being capable of greatly converting and recycling the carbon dioxide resources and is especially suitable for gathering, recovering and applying the carbon dioxide in a large scale in major coal consuming industries, effectively lightening the energy crisis and reducing the carbon dioxide greenhouse effect.

The invention discloses a normal / low-temperature chemical conversion solution for 35CrMnSi steel and a preparing method thereof. The conversion solution consists of the following components in percents by weight: 10-30% of nitric acid, 5-15% of phosphoric acid, 15-25% of zinc oxide, 1-5% of iron powder, 5-10% of a compound accelerant and the balance of water, wherein the compound accelerant is prepared from citric acid and chlorate. The preparing method comprises the following steps: (1), dissolving the zinc oxide in the nitric acid and the phosphoric acid; (2), then, adding the compound accelerant, and after fully dissolving, adding the water; and (3), adding the iron powder into a solution obtained in step (2), taking out the iron powder after curing, and regulating the pH value to 2.0 to 3.0. The normal / low-temperature chemical conversion solution for 35CrMnSi steel does not contain toxic components, the use method is simple and is easy to operate, energy consumption and production cost are low, one layer of even and dense conversion film consisting of 2-5mum flaky zinc phosphate crystals can be formed on the surface of a base body, and the corrosion resistance is great.

The invention discloses a method and a device for preparing aromatic hydrocarbons from syngas. The preparation method comprises the following steps: a first reaction zone is filled with a catalyst, and the syngas is converted into olefin-based hydrocarbons at a high temperature; and a second reaction zone is filled with another catalyst, benzene / toluene is introduced, and the olefins undergo alkylation reaction at a low temperature in the presence of a large amount of hydrogen and CO2 to make the olefins highly selectively converted into the aromatic hydrocarbons. The preparation method has the characteristics of high conversion rate of the raw material, high yield of the aromatic hydrocarbons, low olefin content and easy separation of outlet gas, low cost, and easiness in amplification. The invention also provides the device for realizing the preparation method.

A process for preparing cerium lanthanum oxide nanoparticles used to treat VOCs features the azeotropic distillation of metallic nitrate, high-molecular surface modifier and n-butanol. It has high catalytic performance.

The invention provides a preparation method and application of a Pd / modified bauxite catalyst. The preparation method comprises the following steps: carrying out hydrothermal treatment on natural bauxite at the temperature of 130-170 DEG C for 48-72 h, then drying at the temperature of 80-110 DEG C for 4 h, and roasting for 2-4 h at the temperature of 550-650 DEG C to obtain a modified bauxite carrier; at room temperature, dipping the modified bauxite carrier in H2PdCl4 solution (0.03 g / ml) with volumetric method, drying with an infrared lamp, and roasting for 2-6 h at the temperature of 450 DEG C to obtain the Pd / modified bauxite catalyst with different Pd loadings. According to the invention, the Pd / modified bauxite catalyst is used as the catalyst of a CO oxidation reaction, so that the invention has creativity. The preparation process is simple without discharging of waste water, and the catalyst can be synthesized in a great lot. The catalyst is applied in the CO oxidation reaction with low load capacity and high catalytic activity. The preparation method can greatly reduce production cost. The invention has a good application prospect.

The invention relates to the technical field of regeneration of deactivated catalysts, in particular to a regeneration method of a deactivated COS hydrolytic agent. The regeneration method of the inactivated COS hydrolytic agent comprises the following steps: under the atmosphere of reducing gas, carrying out primary heating and heat preservation on the inactivated COS hydrolytic agent to obtain afirst regenerated COS hydrolytic agent; and maintaining the atmosphere of the reducing gas, carrying out secondary heating on the first regenerated COS hydrolytic agent, introducing carbon dioxide gas containing saturated steam into the atmosphere of the reducing gas, and carrying out heat preservation at a secondary heating temperature to obtain the regenerated COS hydrolytic agent. The regeneration method of the inactivated COS hydrolytic agent provided by the invention is a green regeneration method which does not need to be washed by a solution, does not add an active component additive and can effectively save the regeneration period.

The invention discloses a double metal cobalt-based catalyst, which comprises an active oxide kernel and a porous inert oxide shell layer, wherein the component of the active oxide kernel is one of a main active component Co3O4 and an auxiliary active component Cu oxide or Fe oxide; the porous inert oxide shell layer comprises a component SiO2-NxOy, wherein NxOy is one of ZrO2 or CeO2; and the weight percent of the main active component Co3O4 is 10-40wt%; the weigh percent of the auxiliary active component sis 1-5wt%, the weight percent of the NxOy is 1-3wt% and the balance is SiO2. The double metal cobalt-based catalyst has the advantages that the high-temperature stability and the hydrothermal stability of active metal oxide nanoparticles are improved, the activity of the catalyst is improved and the service life of the catalyst is prolonged.

The invention provides a method for improving weather resistance of decorative base paper titanium dioxide, and belongs to the technical field of decorative base paper titanium dioxide. The control is performed through salt treatment and calcination. The method comprises the following steps of A, using bleached slurry as raw materials; adding titanium dioxide sol into the raw materials; controlling the addition to meet the requirement that the proportion of TiO2 in the titanium dioxide sol to TiO2 in metatitanic acid is 2 to 6 percent; performing water washing; diluting the slurry subjected to water washing into 300 to 400g / L TiO2 slurry; B, adding potassium and phosphorus solution with the K2O / P2O5 ratio being 1.3 to 4.0 into the diluted slurry; performing stirring; adding aluminum-containing compound solution according to the Al2O3 to TiO2 proportion being 0.3 to 0.9 percent; performing stirring; C, performing pressurized filtering on the slurry material treated by the step B until the filter cake solid content is 45 to 55 percent; C, roasting the filter cake in the step C for 8 to 10h at the roasting temperature of 200 to 950 DEG C. Through the control on the salt treatment and roasting processes, the primary product weather resistance of the decorative base paper titanium dioxide is improved; the weather resistance of the decorative base paper titanium dioxide is further improved.