101 results about "Combinatorial catalysis" patented technology

The invention belongs to the technical field of catalysis, and particularly discloses a monolithic catalyst for catalyzing combustion of volatile organic compounds and a preparation method of the catalyst. According to the catalyst, cordierite honeycomb ceramic serves as a carrier, and the carrier is coated with a coating containing a metal active component and an auxiliary, wherein the catalyst active component is selected from any one or a combination of noble metals of Pt and Pd, and the catalyst auxiliary is selected from one or a combination of metal oxides such as aluminum oxide, titanium oxide, chromic oxide, cobaltous oxide and manganese oxide. The preparation method of the catalyst is simple, and the catalyst has the advantages that the coating is not prone to disengagement, the initiation temperature is low, the activity is good, the high-temperature-resistant property is good, and the noble metal content is low; the catalyst can be widely used for purification treatment of organic waste gas.

The invention relates to a composite catalyst capable of eliminating four main pollutants in diesel engine tail gas simultaneously and a method for purifying the diesel engine tail gas. The composite catalyst consists of an oxidation catalyst and a reduction catalyst, wherein the active components of the oxidation catalyst are selected from perovskite or similar perovskite composite oxides, and the reduction catalyst is an HZSM-5 molecular sieve modified by a transition metal oxide. The composite catalyst is filled into two catalyst bed layers in a constant temperature section of a reactor so that the diesel engine tail gas passes through the reduction catalyst bed layer and the oxidation catalyst bed layer and is warmed up to perform reaction, thus the aim of eliminating the pollutants of carbon particles, hydrocarbons, carbon monoxide, nitrogen oxide and the like simultaneously can be achieved. Because of the high efficiency oxidizing property and high efficiency reducing property, the used composite catalyst can purify the diesel engine tail gas under a comparatively mild condition.

The oxidation of carbon monoxide (CO) and hydrocarbons (HC) in an oxygen-containing gas stream, such as the exhaust stream from a diesel engine, or other lean-burn engine, may be catalyzed using a combination of mixed oxide particles of cerium, zirconium and copper, and discrete particles of an alumina-supported platinum group metal catalyst. The catalyzed oxidation of CO and HC by this combination of oxidation catalyst particles is effective at temperatures below 300° C.

Combinations of catalyst and compound are described that are suitable for use in a thermally regenerative fuel cell. Such combinations offer greater than 99% selectivity and accordingly they cycle through a reversible dehydrogenation process with substantially no loss due to byproduct formation. Combinations of secondary benzylic alcohols and Pd/SiO₂ catalysts offer levels of by-products that are undetectable by NMR and GC analysis. With such TRFC, thermal energy can be converted into electric energy in a moving vehicle without the requirement of storage of H₂, and its safety issues. Instead, a catalytic amount of H₂ is cycled through the system and used to generate electric energy.

The invention discloses a method for preparing a straight-chain carbonyl compound by catalyzing unsaturated hydrocarbon through a polydentate phosphine ligand modified palladium combined catalyst. The straight-chain carbonyl compound comprises carboxylic acid, carboxylic ester and amide. The combined catalyst is composed of a divalent or zero-valent palladium compound, a polydentate phosphine ligand and an acidic auxiliary agent. Under the action of the combined catalyst, unsaturated hydrocarbon, carbon monoxide and a nucleophilic reagent are used as raw materials for carbonylation reaction to successfully prepare the straight-chain carbonyl compound. The nucleophilic reagent comprises water, alcohol, organic primary amine or inorganic ammonia. The catalyst provided by the invention has the advantages of high catalytic activity, good straight-chain carbonyl compound selectivity, good stability and recyclability. The method is a one-pot homogeneous synthesis process, the synthesis process is simple, reaction conditions are mild, a new technology is provided for synthesis of important chemical straight-chain carbonyl compounds, and the method has good application and popularization prospects.

The invention discloses a method for producing spermidine by using cheap substrates and engineering bacteria, and belongs to the technical field of bioengineering. The method is characterized in thatrecombinant cells or a combination of recombinant cells expressing gamma-glutamyl kinase, glutamate-5-semialdehyde dehydrogenase, aspartokinase, aspartate-beta-semialdehyde dehydrogenase, amine dehydrogenase, L-2,4-diaminobutanoate decarboxylase, carboxyspermidine dehydrogenase, carboxyspermidine decarboxylase, glucose dehydrogenase, and polyphosphate kinase 2-I are constructed; and aspartic acidand arginine are catalyzed to synthesize the spermidine by utilizing the recombinant cells or the combination of the recombinant cells. According to the method, selected oxidoreductase can efficientlyuse NAD (NADH) as coenzyme, and the product feedback inhibition is avoided in a reaction process; and the method has a good industrial application prospect.

The invention relates to a method for preparing 1, 6-hexamethylenediamine by ammoniating hexamethyleneimine. The catalyst in the method comprises an active component, an auxiliary agent and a carrier, the active component is one or a combination of transition metals Ni, Fe, Ru and Re, the auxiliary agent is one or a combination of elements W, B, Ir, Pt, Os, Co, Cu, Rh and Mo, and the carrier is one or a combination of Al2O3, activated carbon, a molecular sieve, SiO2 and Al2O3-SiO2 which are subjected to ammoniation treatment. The weight of the active component in the catalyst accounts for 1-45% of the weight of the catalyst, and the weight of the auxiliary agent accounts for 0.05-15% of the weight of the catalyst. The catalyst is used for preparing 1, 6-hexamethylenediamine by ammoniating hexamethyleneimine in a hydrogen atmosphere, has the advantages of high activity, high target product yield, good stability, good economical efficiency and the like, and has a wide application prospect.

The invention provides a continuous preparation method of 2,3,3,3-tetrafluoropropene, comprising the following steps: carrying out liquid-phase catalytic telomerization reaction on ethylene and carbon tetrachloride serving as initial raw materials in the presence of a composite catalyst to obtain a reaction product; performing two-stage membrane separation and purification on the reaction product, and then sequentially performing a primary high-temperature cracking reaction, a gas-phase chlorination reaction, a secondary high-temperature cracking reaction, a primary gas-phase catalytic fluorination reaction and a secondary gas-phase catalytic fluorination reaction to obtain a reaction product; condensing and rectifying the secondary gas-phase catalytic fluorination reaction product to obtain the 2,3,3,3-tetrafluoropropene product.

The invention relates to a combined catalyst and a method for producing white oil, wherein the combined catalyst comprises a first catalyst and a second catalyst, the first catalyst contains a ten-membered ring molecular sieve M1, the second catalyst contains a twelve-membered ring molecular sieve M2, the first catalyst and the second catalyst are respectively filled in different reactors, and theten-membered ring molecular sieve M1 and/or the twelve-membered ring molecular sieve M2 has the following characteristics that a molar ratio of silicon oxide to aluminum oxide is 120-300, the catalyst contains a mesoporous structure, a closed hysteresis loop appears at a low-temperature nitrogen adsorption-desorption curve P/P0 of 0.4-0.99, and the initial position of the closed hysteresis loop is P/P0 of 0.4-0.7. According to the invention, with the application of the method to produce white oil, the good aromatic hydrocarbon saturation effect can be obtained.

The invention relates to a combined catalyst and a method for producing biological aviation kerosene, wherein the combined catalyst comprises a first catalyst and a second catalyst, the first catalystcontains a twelve-membered ring molecular sieve M1, the second catalyst contains a twelve-membered ring molecular sieve M2, the first catalyst and the second catalyst are respectively filled in different reactors, and the twelve-membered ring molecular sieve M1 and/or the twelve-membered ring molecular sieve M2 has the following characteristics that a molar ratio of silicon oxide to aluminum oxide is 120-300, the catalyst contains a mesoporous structure, a closed hysteresis loop appears at a low-temperature nitrogen adsorption-desorption curve P/P0 of 0.4-0.99, and the initial position of theclosed hysteresis loop is P/P0 of 0.4-0.7. According to the invention, with the application of the method to produce biological aviation kerosene, the good pour point depressing effect can be obtained, and the yield is high.

The invention discloses a method for preparing 5-hydroxymethylfurfural by catalyzing cellulose formate with a dimethyl sulfoxide-water cosolvent system. The method comprises the following steps: firstly, adding alpha-cellulose into a formic acid solution for oil-bath heating, and carrying out centrifugal filtration to obtain a reaction filtrate; carrying out rotary evaporation and concentration onthe reaction filtrate, pouring the filtrate into an ethanol solution, and carrying out centrifugal filtration to obtain a white precipitate; pouring the white precipitate into an ethanol solution, carrying out centrifuging and filtering, repeating the operation for three times, and implementing freeze-drying to obtain cellulose formate; finally, performing microwave catalytic conversion in a dimethyl sulfoxide water cosolvent system by taking alpha-cellulose or cellulose formate as a substrate, and hydrochloric acid and aluminum chloride as catalysts to obtain the 5-hydroxymethylfurfural. Cellulose is treated with formic acid for acidolysis and formylation to obtain cellulose formate, and aluminum chloride hydrochloride is used as a combined catalyst to directly and efficiently catalyze cellulose formate in a dimethyl sulfoxide water cosolvent system to prepare 5-hydroxymethylfurfural.

A reactor for conducting catalytic chemical reactions has been developed. T he reactor has a well having an open end and a closed end. The reactor also has a sleeve having a top end and a bottom end. The bottom end of the sleeve is inserted within the open end of the well. A fluid permeable structure is attached to the sleeve spanning the cross-section thereby defining a chamber between the closed end of the well and the fluid permeable structure. The reactor also has a reactor insert having a fluid permeable end and a top end containing a first and a second fluid conduit. The fluid permeable end of the reactor is inserted within the open end of the sleeve. The first fluid conduit is in fluid communication with the chamber, and the second fluid conduit is in fluid communication with the fluid permeable end of the reactor insert.

The invention discloses a method for preparing tetrahydrofurfuryl alcohol and pentanediol through furyl alcohol hydrogenation. According to the method, furfuryl alcohol is taken as a substrate, isopropanol is taken as a solvent, a metal supported carbon-based catalyst and calcium oxide are taken as a combined catalyst, hydrogenation reaction is carried out at 150-180 DEG C in a hydrogen environment of 1-4MPa under a stirring condition, and tetrahydrofurfuryl alcohol, 1, 2-pentanediol and 1, 5-pentanediol are prepared. The method disclosed by the invention realizes high-value conversion of furfuryl alcohol, is simple and convenient in production process and low in operation difficulty, and has a certain popularization and application prospect.

Catalyst support materials, catalysts, methods of making such and uses thereof are described. Methods of making catalyst support material include combining anatase titania slurry with i) a low molecular weight form of silica; and ii) a source of Mo to form a TiO₂—MoO₃—SiO₂ mixture. Catalyst support material include from about 86% to about 94% weight anatase titanium dioxide; from about 0.1% to about 10% weight MoO₃; and from about 0.1% to about 10% weight SiO₂. Low molecular weight forms of silica include forms of silica having a volume weighted median size of less than 4 nm and average molecular weight of less than 44,000, either individually or in a combination of two or more thereof. Catalyst include such catalyst support material with from about 0.1 to about 3% weight of V₂O₅ and optionally from about 0.01% to about 2.5% weight P.

The invention discloses a preparation method of 3,3',4,4'-tetraaminobiphenyl The method comprises the following steps: in the presence of a first catalyst and a second catalyst, carrying out an amino substitution reaction on dichlorobiphenyl diamine and an ammoniation reagent to obtain a crude 3,3',4,4'-tetraaminobiphenyl product; and carrying out post-treatment on the crude 3,3',4,4'-tetraaminobiphenyl product to obtain a purified 3,3',4,4'-tetraaminobiphenyl product, wherein the first catalyst is a mixture of specified amino acid and cuprous salt, and the second catalyst is a phase transfer catalyst. Specific amino acid and the phase transfer catalyst are innovatively introduced to assist a small amount of cuprous salt in forming a new combined catalyst, so the smooth proceeding of the amino substitution reaction can be efficiently promoted, and reaction yield and product purity are improved. The usage of cuprous salt in the catalyst is obviously reduced, so the post-treatment pressure of high-concentration heavy metal salt wastewater is effectively reduced. Reaction temperature and reaction pressure are milder, so energy consumption is reduced, the safety of a process flow is improved, and the method is more suitable for industrial production.

The invention relates to a combined catalyst and a method for producing high-quality naphtha, wherein the combined catalyst comprises a first catalyst and a second catalyst, the first catalyst contains a twelve-membered ring molecular sieve M1, the second catalyst contains a twelve-membered ring molecular sieve M2, the first catalyst and the second catalyst respectively and independently contain active metal components Pt and Cu, the second catalyst further contains or does not contain a ten-membered ring molecular sieve M3, and at least one of the molecular sieves has the following characteristics that a molar ratio of silicon oxide to aluminum oxide is 120-300, the catalyst contains a mesoporous structure, a closed hysteresis loop appears at a low-temperature nitrogen adsorption-desorption curve P/P0 of 0.4-0.99, and the initial position of the closed hysteresis loop is P/P0 of 0.4-0.7. According to the invention, with the application of the method to produce high-quality naphtha, the yield is high, and the aromatic hydrocarbon content is low.

A method for removing sulfate iron-containing compounds from a low- to moderate-temperature metal sulfide leach circuit (1) is disclosed. A reactor (6) within a chloride leach circuit (5) and which is preferably maintained at a temperature between 20 and 150 degrees Celsius may be provided with a catalyst (4) comprising a material selected from the group consisting of: colloidal hematite, colloidal goethite, particulate containing FeOOH, particulate containing α-FeOOH, particulate containing γ-FeOOH, particulate containing Fe₂O₃, particulate containing α-Fe₂O₃, particulate containing γ-Fe₂O₃, particulate containing Fe₃O₄, particulate containing Fe(OH)SO₄, and a combination thereof. The catalyst (4) may also be used with heap leach and/or dump leach circuits (22), without limitation. Methods for using and generating the catalyst (4) are also disclosed. In some embodiments, the catalyst (4) may be used as an anti-frothing agent (e.g., for zinc leaching, without limitation).