65results about How to "Improve transformation activity" patented technology

The invention relates to a catalyst for alkylation of benzene and methanol, and preparation and application thereof. The catalyst employs H-type MCM-56 zeolite and gamma- or eta-Al2O3 as a composite carrier to load one or more selected from the group containing molybdenum, nickel, magnesium, lanthanum, boron or oxides thereof. The carrier comprises, calculated by a total weight of the carrier being 100%, 50-80% of the H-type MCM-56 zeolite and 20-50% of the Al2O3; and the loaded molybdenum, nickel, magnesium, lanthanum, boron or oxides thereof account for 3-20 wt% of the carrier. The catalyst has high conversion activity on benzene and methanol, high xylene selection, benzene conversion rate reaching more than 50%, and selectivity on toluene and xylene higher than 90%, so that the catalyst fully utilizes the resources of benzene and methanol, as well as reduces production costs on toluene and xylene.

The invention provides a two-section type catalyst for diesel vehicle exhaust treatment. The catalyst comprises a catalyst A at a gas inlet end and a catalyst B at a gas outlet end, wherein the catalyst A has the general formula: CeO2-X / molecular sieve, and X is selected from CuO, Fe2O3 or MnO2; the catalyst B has the general formula: M@CeO2 / molecular sieve, and M is selected from Rh, Pt or Pd. Compared with the prior art, the two-section type catalyst for diesel vehicle exhaust treatment has a high elimination effect and selectivity for nitric oxides in a relative wide temperature range, can eliminate particulate matter in a certain degree and also has the function of eliminating escaping ammonia. The catalyst B at the gas outlet end also has the functions of a DOC catalyst. Experimental results indicate that the two-section type catalyst has the nitric oxide conversion activity higher than 80%, good stability and excellent N2 selectivity at the high temperature of 150-550 DEG C and at the high space velocity of 240,000 h<-1>, and can eliminate carbon particles in exhaust at about 450 DEG C.

The mercaptol converting catalyst has gamma-Al2O3 as carrier and active components including VIII element(s) in carried amount of 0.5-50.0 wt%, transition metal element(s) in carried amount of 0.1-10.0 wt%, alkali or alkali earth element(s) in carried amount of 0.1-10.0 wt%, and RE element(s) in carried amount of 0.1-10.0 wt%. The preparation process includes the pre-treatment of carrier comprising presoaking in alkali solution and surface oxidation treatment; soaking the gamma-Al2O3 carrier in the solution of the inorganic salts of the active component for one or several times to carry the required active components; and finally drying. The mercaptol converting catalyst has high strength, high mercaptol converting activity and long service life, and is especially suitable for conversion of mercaptol in liquefied gas.

The present invention provides a supported bifunctional catalyst which comprises a molecular sieve carrier, a component A and a component B which are supported on the molecular sieve carrier, and thechemical composition general formula of the catalyst is A-B / Beta, wherein the component A comprises a transition metal element which is a hydrogenation active center, the component B comprises an alkali metal element or an alkaline earth metal, and the molecular sieve carrier comprises a Beta molecular sieve. The invention also provides a preparation method and application of the supported bifunctional catalyst. The supported bifunctional catalyst can be used for preparing 2, 5-furandimethanol diethyl ether (BEMF) through one-step hydrogenation etherification of 5-hydroxymethylfurfural (HMF) catalyzed by the fixed bed, and has high hydrogenation activity and acid catalysis performance, and the HMF conversion rate and the target product yield can reach 99% or above and 75% or above respectively.

The invention relates to a C9<+> aromatic hydrocarbon lightening catalyst, comprising a high-temperature-resistant inorganic oxide carrier and the following components accounted by taking the dry basis carrier as benchmark: 0.01-10.0 weight percent of hydrogenation metal, 0.01-1.0 weight percent of IVA-group metal and 0.1-5.0 weight percent of halogen; wherein, the hydrogenation metal is selected from iron, cobalt, nickel and iridium. The catalyst is used for lightening C9<+> heavy aromatic hydrocarbon. The catalyst has high lightening transformation ratio, high aromatic hydrocarbon yield and less carbon deposition; and the catalyst can effectively lower final boiling point and gum level of the heavy aromatic hydrocarbon.

The invention provides a technology method and a device for preparing ammonium diuranate. The technology is used for preparing ADU (ammonium diuranate) with high conversion activity from UO2F2 solution which is prepared by hydrolyzing UF6 and serves as a raw material by performing an ADU precipitation reaction of the UO2F2 solution and ammonia in a reactor. In the technological process, ADU slurry which is formed after prior batch of precipitation is completed is used as detained ADU slurry; and the detained ADU slurry is added into the UO2F2 solution to start to carry out next precipitation batch. The ADU prepared by adopting the technical scheme of the invention has high conversion activity and can be used for preparing UO2 powder with high sintering activity. The invention also designsa device for the ADU precipitation technology. By the device, the ADU preparation technology can be ensured to be carried out safely. Meanwhile, the technology method has the advantages that the technology method has short process and little equipment and automatic control operation is convenient to realize, etc.

The invention discloses a metal-supported hierarchical-pore ZSM-5 molecular sieve. The metal-supported hierarchical-pore ZSM-5 molecular sieve contains mesopores; the average pore diameter of the mesopores is 2-20 nm, and the pore volume of the mesopores is 0.2-0.6 mL / g; and a metal element in the metal-supported hierarchical-pore ZSM-5 molecular sieve is at least one selected from Sn, Mg and Zn,the loading amount of the metal element is 0.1 wt%-10wt%, and a metal loading amount is calculated according to the loading amount of the metal element. The invention also relates to a preparation method of the ZSM-5 molecular sieve and application of the ZSM-5 molecular sieve as a catalyst in catalyzing an etherification reaction of 2,5-furandimethanol and ethanol on a fixed-bed reactor.

This application discloses a hierarchical pore ZSM-5 molecular sieve, a preparation method thereof and application of the hierarchical pore ZSM-5 molecular sieve to the method that the hierarchical pore ZSM-5 molecular sieve serves as a catalyst to catalyze 2,5-furandimethanol and monohydric alcohol etherification for preparing 2,5-furandimethanol dimethyl ether. The pore diameter of mesopores inthe hierarchical pore ZSM-5 molecular sieve is 2-6 nm, and the pore volume of the mesopores is 0.4-0.6 mL / g. The invention further relates to the preparation method of the hierarchical pore ZSM-5 molecular sieve and the application of the hierarchical pore ZSM-5 molecular sieve serving as the catalyst in a 2,5-furandimethanol and monohydric alcohol etherification reaction.

The invention relates to the technical field of carbon material preparation, and particularly discloses a eutectic solvent, carbon quantum dots, a preparation method and application. The eutectic solvent is prepared from a phenolic compound and hydrophobic amino acid in a molar ratio of 1: 0.2-5. The preparation method of the carbon quantum dots comprises the following steps: roasting the eutecticsolvent at 250-600 DEG C, and drying to obtain the carbon quantum dots. The carbon quantum dots provided by the invention contain a hydrophobic group and have good affinity with a lignin model compound, so that the dispersity of the prepared carbon quantum dots is improved, the sufficient contact between the carbon quantum dots and lignin is promoted, and the conversion rate of the carbon quantumdots and lignin is improved; the carbon quantum dots are also modified with hydroxyl and amino functional groups with stable structures, so that the selectivity of lignin degradation reaction is improved, the yield of a target phenol product is further improved, efficient degradation of lignin can be realized under normal-pressure and low-temperature natural light conditions, and the carbon quantum dots have a wide application prospect.

The invention relates to a high-stability modified Y-type molecular sieve and a preparation method thereof, wherein the modified Y-type molecular sieve contains 5-12 wt% of RE2O3 and 0.1-0.7 wt% of Na2O, and has the total pore volume of 0.33-0.39 mL / g, the pore volume of the secondary pores with the pore size of 2-100 nm accounts for 10-25% of the total pore volume, the unit cell constant is 2.440-2.455 nm, the non-framework aluminum content is not more than 20% of the total aluminum content, the lattice collapse temperature is not below 1050 DEG C, and the pyridine adsorption infrared methoddetermination results show that a ratio of the amount of B acid to the amount of L acid is not less than 2.50. The preparation method comprises: ion exchange, modification treatment at a certain temperature under water vapor conditions, and reaction with silicon tetrachloride. According to the present invention, the modified Y-type molecular sieve has advantages of high heavy oil conversion activity, low coke selectivity, high diesel yield, high liquefied gas yield, high light-oil yield and high total liquid recovery.

The invention discloses application of carbonyl reductase (RasADH) derived from Ralstonia sp. DSM 6428 and RasADH mutants as biocatalysts for catalyzing 5-(alpha-haloacetyl)-8-substituted oxygen radical-(1H)-quinolin-2-ketone to synthesize Indacaterol chiral intermediates. Being used for reducing the substrate, namely the 5-(alpha-haloacetyl)-8-substituted oxygen radical-(1H)-quinolin-2-ketone, the RasADH is relatively low in enzyme activity, so that addition of a large amount of thallus or protein during transformation is required. By adopting a protein engineering means, seven mutants of theRasADH, namely RasADH E189A, RasADH Q191A, RasADH R202F, RasADH F205A, RasADH Q191A / F205A, RasADH Q191A / R202F / F205A and RasADH E189A / Q191A / R202F / F205A, can be obtained; and the seven RasADH mutants have significantly improved enzyme activity on the substrate. Therefore, highly efficient transformation can be realized during transformation of the substrate; and moreover, when product configurationis R, stereo-selectivity is higher than 99%.

The invention discloses a preparation method for a KL molecular sieve catalyst. The KL molecular sieve catalyst is prepared by the following steps: adding potassium hydroxide, sodium hydroxide and sodium aluminate into deionized water in sequence, and performing stirring at room temperature to form a clear solution A; adding a silica gel dropwise into the solution A, and performing stirring to form a uniform emulsion B, wherein the molar ratio of K2O to Na2O to Al2O3 to SiO2 to H2O is 5.4:5.7:1:x:500, and the value of x is 1-60; and allowing the obtained emulsion B to stand for 20-36 h, movingthe obtained solution into a stainless steel hydrothermal kettle containing a polytetrafluoroethylene lining, and performing crystallization in a drying oven at the temperature of 120-200 DEG C for 12-36 h. According to the method provided by the invention, the prepared catalyst has high conversion activity of fructose, and greatly improves the yield of 5-hydroxymethylfurfural.

The invention relates to a super-stable Y-type molecular sieve containing phosphorus and rare earth, wherein the Y-type molecular sieve contains 4-11 wt% of rare earth, 0.05-10 wt% of phosphorus and 0.1-0.7 wt% of sodium oxide, and has the pore volume of 0.33-0.39 mL / g, the pore volume of the pores with the pore size of 2-100 nm accounts for 15-30% of the total pore volume, the unit cell constantis 2.440-2.455 nm, the non-framework aluminum accounts for less than 20% of the total aluminum, the lattice collapse temperature is more than 1050 DEG C, and a ratio of the amount of B acid to the amount of L acid is not less than 2.50. The preparation method comprises: preparing a rare earth-containing Y-type molecular sieve having a conventional unit cell size, calcining for 4.5-7 h at a temperature of 350-480 DEG C under 30-90% by volume of steam atmosphere, carrying out phosphorus modification treatment, and carrying out a contact reaction with silicon tetrachloride gas. According to the present invention, the Y-type molecular sieve has advantages of good hydrothermal stability, high heavy oil conversion activity, low coke selectivity, high heavy oil conversion diesel yield, high liquefied gas yield and high total liquid recovery.

The invention discloses a preparation method of a hierarchical pore molecular sieve, and the method comprises the following steps of: treating a to-be-treated molecular sieve in a solution containingalkali and a surfactant, and performing roasting to obtain an alkali-treated molecular sieve; carrying out ammonium exchange on the molecular sieve subjected to alkali treatment, and performing roasting to obtain an acidic molecular sieve subjected to alkali treatment; and putting the acidic molecular sieve subjected to alkali treatment into an acid-containing solution for treatment, and conducting roasting to obtain the hierarchical pore molecular sieve. According to the preparation method of the hierarchical pore molecular sieve, a commercial microporous molecular sieve is taken as a treatment object, and the hierarchical pore molecular sieve is prepared by adopting a simple acid-base post-treatment method. The hierarchical pore molecular sieve is used as a catalyst, and can efficientlycatalyze the etherification reaction of furan compounds to obtain high yield of furan ether compounds.

The invention discloses an alkane hydroisomerization catalyst and a preparation method and application thereof. The catalyst consists of 5 to 60 percent of modified B-Beta zeolite, 20 to 70 percent of macroporous inorganic refractory oxide, 0 to 30 percent of microporous alumina and 0.05 to 1 percent of group VIII metal Pt or Pd as a hydrogenation component or 0.1 to 10 percent of group VIII metal Ni as a hydrogenation component; and the properties of the modified B-Beta zeolite are as follows: the molar ratio of SiO2 to B2O3 is 20 to 150, the secondary pore volume which is greater than 2nm accounts for more than 40 percent of the total pore volume, the specific surface is 500m2 / g to 750m2 / g, the infrared acidity is 0.05mmol / g to 0.50mmol / g, and the content of Na2O is less than 0.2 percent by weight. Compared with the prior art, the catalyst has the advantage of good comprehensive properties in terms of activity, crackability, isomerization degree and the like.

The invention discloses a soybean powder immersion liquid medium suitable for the growth and transformation of soybean isoflavone transformed strains. The medium comprises 0.5-2.5 wt% of lactose, 0.1-0.5 wt% of ammonium sulfate, 0.6-0.9 wt% of K2HPO4 and KH2PO4, 0.002-0.005 wt% of MnSO4, and the balance being soybean powder immersion base liquid; the ratio of the K2HPO4 to KH2PO4 is 1:4-2:1; and the mass concentration of the soybean powder immersion base liquid is 2%. According to the invention, cheap soybean vegetable proteins are used to replace expensive animal proteins such as cow brain, cow heart, cow liver and the like, thus greatly reducing the medium cost without influencing the transformation rate of the strains.

The invention relates to a lithium-sulfur battery. The lithium-sulfur battery comprises a cathode, an anode, a lithium-sulfur battery diaphragm and an electrolyte, the electrolyte is located between the cathode and the anode, and the lithium-sulfur battery diaphragm is arranged between the cathode and the anode and located in the electrolyte, wherein the lithium-sulfur battery diaphragm comprisesa base diaphragm and a functional layer, the functional layer is arranged on the surface of the base diaphragm, the functional layer comprises a carbon nano tube structure framework and multiple MoP2nano-particles, the MoP2 nano-particles are arranged on the surface of the carbon nano tube structure framework, micropores of the carbon nano tube structure framework are filled with the MoP2 nano-particles, and the carbon nano tube structure framework is used for supporting the MoP2 nano-particles, and when the lithium-sulfur battery diaphragm is applied to the lithium-sulfur battery, the functional layer directly faces the cathode of the lithium-sulfur battery.

The invention discloses a method for preparing tetrahydrofuran dimethanol dialkyl ether from 5-hydroxymethylfurfural in one step. The method comprises the following steps: introducing a raw material containing 5-hydroxymethylfurfural into a reaction zone, firstly contacting with a catalyst bed layer containing a catalyst I in a hydrogen-containing atmosphere, and then contacting with a catalyst bed layer containing a catalyst II to prepare 2,5-tetrahydrofuran dimethanol dialkyl ether, wherein the catalyst I is selected from at least one of catalysts for preparing 2, 5-tetrahydrofuran dimethanol from 5-hydroxymethylfurfural, and the catalyst II is selected from at least one of catalysts for preparing 2, 5-tetrahydrofuran dimethanol dialkyl ether from 2, 5-tetrahydrofuran dimethanol. The catalytic process can be used for continuously and efficiently obtaining the tetrahydrofuran dimethyl carbinol dialkyl ether product, has the advantages of simplicity in operation, high product yield, stable catalyst performance and the like, and has a good application prospect.

The invention belongs to the technical field of catalytic materials, and relates to a silicon-aluminum material, preparation thereof and a low-green-coke high-activity heavy oil conversion catalytic cracking catalyst. The anhydrous weight chemical expression of the silicon-aluminum material is (0-1) Na2O. (15-50) Al2O3. (85-50) SiO2, the most probable pore size is 10-100 nm, the specific surface area is 150-600 m < 2 > / g, the pore volume is 0.5-1.5 ml / g, and the pore volume of pores with the pore diameter of more than 10nm accounts for 70-98% of the total pore volume. The preparation method comprises the steps of adding an alkaline silicon source into an acidic aluminum source, contacting with alkali, and washing. The low-green-coke high-activity heavy oil conversion catalytic cracking catalyst contains the silicon-aluminum material and an in-situ crystallization Y-type molecular sieve. The catalytic cracking catalyst has good coke selectivity.

An ultra-stable Y-type molecular sieve containing phosphorus and rare earth and a preparation method thereof. The Y-type molecular sieve contains 4 to 11 wt% rare earth, 0.05 to 10 wt% phosphorus, 0.1 to 0.7 wt% sodium oxide, and has a pore volume of 0.33 to 0.39 mL / g, the volume of 2-100nm pores accounts for 15-30% of the total pore volume, the unit cell constant is 2.440-2.455nm, non-framework aluminum accounts for less than 20% of the total aluminum, the lattice collapse temperature is greater than 1050°C, and the B acid content The ratio to the amount of L acid is not less than 2.50. The preparation method includes: preparing a Y-type molecular sieve with a conventional unit cell size containing rare earth, roasting it for 4.5-7 hours in an atmosphere of 350-480°C and 30-90 volume % water vapor, phosphorus modification treatment and mixing with silicon tetrachloride gas. Contact reaction steps. The Y-type molecular sieve has good hydrothermal stability, high heavy oil cracking activity, good coke selectivity, and high yields of heavy oil converted into gasoline, liquefied gas and total liquid.

The invention discloses a rare earth modified ethylbenzene dealkylation catalyst and a preparation method thereof. The rare earth modified ethylbenzene dealkylation catalyst is prepared from a rare earth modified molecular sieve, metal oxide and the balance of adhesive, wherein the rare earth modified molecular sieve is prepared from an EUO molecular sieve, a ZSM-5 molecular sieve and one or any combination of oxides of lanthanum, cerium, neodymium, europium, samarium and praseodymium. The preparation process of the catalyst is characterized by loading rare earth metal oxide onto the molecularsieve through ion exchange and then preparing the rare earth modified molecular sieve into the catalyst; the catalyst shows higher ethylbenzene conversion activity and higher selectivity to xylene inthe isomerization reaction of ethylbenzene dealkylation xylene; meanwhile, the loss rate of the xylene is significantly reduced.

The invention discloses an efficient genetic transformation method for agrobacterium-mediated sugarcane calluses, and belongs to the field of tissue culture. According to the invention, by enhancing the Agrobacterium tumefaciens Vir gene induction activation level and the bacterial liquid dip dyeing strength of sugarcane calluses, the occurrence frequency of transgenic events is greatly improved; an antioxidant is added into subsequent co-culture, screening and differential culture media to inhibit callus browning caused by agrobacterium-enhanced dip dyeing, so that the survival rate and the differentiation capacity of the dip-dyed calluses are obviously improved; a double-marker screening system with a green fluorescent protein marker EGFP gene and a herbicide glufosinate-ammonium resistance marker Bar gene at the same time is adopted, positive transgenic calluses are visually and nondestructively screened by using an EGFP marker, positive transgenic differentiated seedlings are screened by using Bar marker resistance, the accuracy of transgenic event screening is remarkably improved, and the screening efficiency is improved. And finally, the efficient genetic transformation of the agrobacterium tumefaciens mediated sugarcane callus is realized.

The present invention relates to a high-temperature sintering type sulfur-containing iron-based catalyst and a preparation method thereof. A purpose of the present invention is to mainly solve the problems of low CO conversion rate and low low-carbon olefin selectivity in the low-carbon olefin preparation reaction with synthesis gas, and poor strength and poor thermal stability of the catalyst under the use condition in the prior art. The catalyst comprises, by weight, a) 5-50 parts of iron or an oxide thereof; b) 1-15 parts of ruthenium or an oxide thereof; c) 10-30 parts of calcium or an oxide thereof; d) 10-30 parts of at least one element selected from vanadium and chromium, or an oxide thereof; e) 10-75 parts of aluminum or an oxide thereof; and f) added trace amount calcium sulfate, wherein the catalyst contains 20-200 ppm sulfur based on the total weight of the iron-based catalyst. With the technical scheme, the problems in the prior art are well solved. The catalyst of the present invention can be used for the low-carbon olefin preparation with synthesis gas in industrial production.

The invention relates to a method for preparing bis-(5-formylfurfuryl)ether from 5-hydroxymethyl furfural. The method comprises the step of dehydrating 5-hydroxymethylfurfural in the presence of a catalyst to obtain bis-(5-formylfurfuryl)ether, wherein the catalyst is metal trifluoromethanesulfonate. The 5-hydroxymethylfurfural used in the method can be conveniently obtained from biomass. The usedmetal trifluoromethanesulfonate catalyst has strong water resistance, can well maintain catalytic activity, and realizes high yield. The catalyst is easy to recover and can be repeatedly used, and the catalytic activity is not reduced. The method disclosed by the invention has the advantages of high conversion activity, high yield and excellent stability, reaction products are simple to separate,and the high-purity bis-(5-formylfurfuryl)ether can be obtained. Meanwhile, the prepared bis-(5-formylfurfuryl)ether can be used as a raw material for preparing polyamide materials.

The invention discloses a high-stability modified Y-type molecular sieve for high production of isomerized C4 and a preparation method of the high-stability modified Y-type molecular sieve. The CaO content of the modified Y-type molecular sieve is 0.3-4 wt%, the RE2O3 content is 2 to 7 wt%; the content of Na2O is 0.1 to 0.5 wt%; the total pore volume is 0.33 mL / g to 0.39 mL / g; the pore volume of the secondary pores of 2-100nm accounts for 10-25% of the total pore volume; the lattice constant is 2.440-2.455 nm, the content of non-framework aluminum accounts for not more than 20% of the total aluminum content, the lattice collapse temperature is not lower than 1050 DEG C, and the ratio of the amount of acid B to the amount of acid L measured by a pyridine adsorption infrared method at 200 DEG C is not lower than 2.30. The preparation method comprises the steps of ion exchange, modification treatment under certain temperature and water vapor conditions and reaction with silicon tetrachloride. The modified Y-type molecular sieve has higher heavy oil conversion activity, lower coke selectivity, higher gasoline yield and isomeric C4 yield, and higher isomeric hydrocarbon content in gasoline.

The invention relates to a C9+ aromatic hydrocarbon lightening catalyst, comprising a high-temperature-resistant inorganic oxide carrier and the following components accounted by taking the dry basis carrier as benchmark: 0.01-10.0 weight percent of hydrogenation metal, 0.01-1.0 weight percent of IVA-group metal and 0.1-5.0 weight percent of halogen; wherein, the hydrogenation metal is selectedfrom iron, cobalt, nickel and iridium. The catalyst is used for lightening C9+ heavy aromatic hydrocarbon. The catalyst has high lightening transformation ratio, high aromatic hydrocarbon yield andless carbon deposition; and the catalyst can effectively lower final boiling point and gum level of the heavy aromatic hydrocarbon.

The invention discloses a bifunctional catalyst. The bifunctional catalyst comprises a carrier and metal elements with hydrogenation activity, wherein the carrier is a hierarchical pore ZSM-5 molecular sieve carrier, and the hierarchical pore ZSM-5 molecular sieve contains a mesoporous structure. The bifunctional catalyst takes a hierarchical pore ZSM-5 molecular sieve as a carrier and is loaded with the metal component with hydrogenation activity. The catalyst has high activity and selectivity and good stability, and has a good application prospect in the field of catalysts.

The invention discloses a preparation method of bis-(5-formyl furfuryl)ether, which comprises the following steps: reacting a material containing 5-hydroxymethylfurfural in the presence of a catalystto prepare bis-(5-formyl furfuryl)ether; wherein the catalyst is a hierarchical pore ZSM-5 molecular sieve. The bis-(5-formyl furfuryl)ether is used as a raw material for preparing a polyamide material and has a wide application prospect.

The invention relates to a lithium-sulfur battery. The lithium-sulfur battery comprises a cathode, an anode, a lithium-sulfur battery diaphragm and an electrolyte, the electrolyte is located between the cathode and the anode, and the lithium-sulfur battery diaphragm is arranged between the cathode and the anode and located in the electrolyte, wherein the lithium-sulfur battery diaphragm comprisesa base diaphragm and a functional layer, the functional layer is arranged on the surface of the base diaphragm, the functional layer comprises multiple carbon nano tubes and multiple MoP2 nano-particles which are uniformly mixed, and when the lithium-sulfur battery diaphragm is applied to the lithium-sulfur battery, the functional layer directly faces the cathode of the lithium-sulfur battery.