49results about How to "High initial activity" patented technology

The invention discloses an imaging model in small animal living bodies with echinococcus granulosus and a construction method thereof. The construction method comprises the steps of: feeding CF-1 male mice; carrying out in vitro culture and drug treatment on protoscolex; carrying out in vitro fluorescence imaging and fluorescence gradient analysis; pretreating mice with depilatory paste for experimental animals, injecting the abdominal cavity of each mouse with chloral hydrate anesthetic, implanting three groups of stained scoleces under Glisson capsules by injection, dividing the mice into three groups according to different groups of injected protoscolex; in a control group, injecting the livers of mice with protoscolex on which drug treatment is not carried out, collecting images every 12 hours after injection, carrying out fluorescence intensity analysis on the ROIs region, putting into a polyethylene cage after imaging, and carrying out in vitro fluorescence gradient detection in the positive control group. The construction method constructs a mouse model with echinococcus granulosus which can express luciferase, provides a platform for drug sensitive tests in living bodies with echinococcosis, and can monitor the growth and transfer of hydatid in the living model dynamically in a long term.

The invention relates to a catalyst for preparing styrene through ethylbenzene dehydrogenation and a preparation method of the catalyst and mainly aims to solve the problems of lower initial activity and longer induction period of the catalyst in the prior art. The technical problems are better solved through the technical scheme that the catalyst and the preparation method thereof are adopted, wherein the catalyst is prepared by adding cerium sources including ammonium ceric nitrate and cerous oxalate as raw materials into a ferrum-potassium-cerium-molybdenum or tungsten catalyst system according to the required proportion. The catalyst can be used for the industrial production of styrene prepared through ethylbenzene dehydrogenation.

The invention relates to an activation method for ethylbenzene dehydrogenation catalyst, which mainly aims at solving the problems of insufficient activation of the catalyst, long induction period, low initial activity, high initial temperature of the reaction and short service life in the prior art. The invention better solves the problems by the technical scheme that dehydrogenation catalyst is activated for more than 48 hours at the reaction temperature of higher than 600 DEG C, with more than 1.5:1 of weight ratio between water and phenylethane and under the pressure of 70-150kPaA. The method has the advantages of promoting the full formation of an active center, short induction period of the catalyst and high initial activity, which can be used for preparing styrene with ethylbenzene dehydrogenation in industrial production.

The invention discloses a preparation method and application of a ball-type activated clay for removing alkene in aromatic hydrocarbons. Compared with common particle white clay, the ball-type activated clay provided by the invention has characteristics of high mechanical strength, high initial alkene removal activity and long running life. Under the reaction temperature of 150-230 DEG C, the ball-type activated clay has initial alkene removal activity no nor than 5.0 mg Br/100g, bromine index reduced to under 20 Br/100g and service life of 1-3 years, and has good industrial application prospects.

The invention relates to a work starting method for slurry bed Fisher-Tropsch synthesis, which is characterized in that a proper amount of a reduced ft synthesis catalyst and a reaction solvent are weighted and placed in a slurry bed reactor, after airtight and gas displacement, the hydrogen mixed gas containing water vapor or organic matter steam containing oxygen is introduced and a stirring device is switched on, the volume concentration of water vapor or oxygen-containing organic matter steam is 1-5%, the volume space velocity of the gas mixture is 500-2000h<-1>, the temperature is heated to 250-350 DEG C, the pressure is controlled at 2.5-3.5 MPa, the temperature and the pressure can be reduced after 1-3 hours to reach the Fisher-Tropsch synthesis reaction condition, and the synthesis gas is switched for Fisher-Tropsch synthesis reaction. The work starting method is used for keeping the high activity during the stable period of a cobalt-based Fischer-Tropasch synthetic catalyst, and reducing the initial activity of the catalyst.

The invention relates to vinyl polymerization catalyst and a preparing method thereof. A dialkyl magnesium compound, an aluminum alkyl compound, an alcohol compound and an organic epoxy compound reach with one another through the catalyst to obtain a magnesium compound solution, then titanium compound reacts with the magnesium compound solution, the obtained solution reacts with alph-olefin, solid particles containing prepolymer are obtained, the solid particles react with linear-chain halogenated alkane, and the final catalyst is obtained. Compared with the prior art, the catalyst is high in polymerization activity, stable in reaction, sensitive in hydrogen regulation and high in stacking density, the obtained polymer grains are narrowly distributed, and the number of fine powder is small.

The invention relates to a method for preparing styrene employing ethylbenzene dehydrogenation, and mainly solves the problems of low initial activity and long induction period of a catalyst in the prior art. The method adopts the technical scheme as follows: a cerium source adopts ceric ammonium nitrate and cerous oxalate as raw materials and then the raw materials are added to the catalyst according to the required ratio in an iron-potassium-cerium-molybdenum or tungsten catalyst system, and meanwhile, the catalyst obtained from a cerium active component by adopting a mode of leading to the catalyst employing a sub-step method is applied to preparation of styrene employing ethylbenzene dehydrogenation, so that the problem is well solved, and the method can be applied to industrial production of styrene preparation employing ethylbenzene dehydrogenation.

The invention relates to a method for start-up and operation of a Fischer-Tropsch reactor comprising the steps of: (a) providing a reactor with a fixed bed of reduced Fischer-Tropsch catalyst that comprises cobalt as catalytically active metal; (b) supplying a gaseous feed stream comprising carbon monoxide and hydrogen to the reactor, wherein the gaseous feed stream initially comprises a nitrogen-containing compound other than molecular nitrogen in an initial concentration in the range of from 0.1 to 50 ppmv based on the volume of the gaseous feed stream; (c) converting carbon monoxide and hydrogen supplied with the gaseous feed stream to the reactor into hydrocarbons at an initial reaction temperature, wherein the initial reaction temperature is set at a value of at least 200° C. and hydrocarbons are produced at a first yield; (d) maintaining the initial reaction temperature at the set value and maintaining the first yield by decreasing the concentration of the nitrogen-containing compound in the gaseous feed stream supplied to the reactor; (e) optionally increasing the reaction temperature after the concentration of the nitrogen-containing compound in the gaseous feed stream has decreased to a value below 100 ppbv.

The invention relates to an iron-based catalyst, a preparation method and application thereof, and mainly solves the technical problem that the initial activity is not high enough when alkyl aromatic hydrocarbon is dehydrogenated to generate alkenyl aromatic hydrocarbon in the prior art. According to the technical scheme, the iron-based catalyst comprises iron, potassium, rare earth metal R and other metal additive components, and satisfies the following formulas that (Fe/R) XRF=3.5-11 and (Fe/R)EDS/(Fe/R)XRF = 0.7-1.1, wherein (Fe/R)XRF is the weight ratio of the iron component to the rare earth metal component in the catalyst represented by an X-ray fluorescence spectrum in terms of elements, and (Fe/R)EDS is the weight ratio of the iron component to the rare earth metal component in the surface of the catalyst, which is characterized by an X-ray energy spectrum instrument, in terms of elements. According to the technical scheme, the technical problem is better solved, and the iron-based catalyst can be used for industrial production of alkenyl arene generated by dehydrogenation of alkyl arene.

The invention discloses a method for stably catalyzing methane cracking hydrogen production by using carbon black enhanced activated carbon and application. According to the method, 8-16-mesh coconut shell activated carbon is adopted as a carrier to load carbon black, two carbon catalysts are combined through a series of preparation processes, and a reaction is performed at 850-1000 DEG C under normal pressure. According to the method, the conversion rate of a single activated carbon catalyst for catalyzing methane cracking hydrogen production is effectively improved, so that the activated carbon catalyst has a higher initial conversion rate and shows an inactivation delaying effect, and the method is a method for effectively improving the catalytic activity of cheap activated carbon. The method has important application value for industrial application of catalyzing methane cracking hydrogen production by the carbon catalyst and increasing the methane cracking conversion rate.

The present invention relates to catalysts, methods of making catalysts, and methods of using catalysts, where the catalysts include: at least one of a transition metal and a transition metal oxide supported by yttria-stabilized zirconia (YSZ), where the transition metal is promoted by at least one of an alkali metal and an alkaline-earth metal.