18results about How to "Long catalyst life" patented technology

The invention discloses a methane reforming catalyst capable of improving hydrothermal resistance as well as a preparation method and application of the methane reforming catalyst, and belongs to the technical field of catalyst preparation. According to the catalyst, a modified HAP-Ce composite carrier is prepared through coprecipitation, hydrothermal treatment and calcination, metal precursor salt serves as a modification component, Ni is impregnated and loaded, calcination is conducted, and then water vapor / nitrogen high-temperature hydrothermal treatment and hydrogen reduction are conducted to obtain the target catalyst. According to the catalyst, a heterogeneous metal oxide composite interface is constructed in situ, stable pinning of Ce species is achieved, and the Ni anchoring effect is enhanced, so that Ce migration and Ni sintering under the hydrothermal condition are inhibited, and high reaction activity, excellent carbon deposition resistance and good hydrothermal stability are shown; the preparation method has the advantages of controllable conditions and simple steps, and is easy for large-scale production and application.

The present invention relates to a flue gas uniform distribution conversion system for acid production, which is composed of an air inlet pipe, an air outlet, a connecting pipe, a primary distribution plate, a shell, a secondary distribution plate, a catalyst layer and a tertiary distribution pipe. The gas uniform distribution conversion system for flue gas acid production of the present invention adopts a primary distribution plate, a secondary distribution plate and a tertiary distribution pipe, and its gas uniform distribution effect can be improved by 60%, the system resistance increase is less than 450Pa, and the cost increase is less than 2%. The SO2 flue gas is evenly distributed with small resistance, which can ensure the balanced reaction temperature of the catalyst layer, the temperature controllability of SO2 conversion to SO3 is strong, the catalyst activity is high, the catalytic life is long, the conversion efficiency is high, the energy consumption is low, and the operating cost is low. The gas uniform distribution conversion system of the present invention has a novel structural design, simple production and manufacturing, and is very suitable for acid production supporting the smelting system.

The invention relates to a catalyst for preparing aldehyde and / or ketone through direct catalytic dehydrogenation of alcohol, and a preparation method and application thereof. The catalyst comprises a compound Me / HAP and an amorphous HAP coating layer, wherein the compound Me / HAP is formed by loading active metal Me on hydroxyapatite HAP, and the active metal Me is coated with the amorphous HAP coating layer. The catalyst Me (at) HAP can be directly used for a reaction for preparing aldehyde and / or ketone through direct catalytic dehydrogenation of alcohol, and the catalyst can also be formed in situ at the temperature of 180-350 DEG C by using the compound Me / HAP in the reaction for preparing aldehyde and / or ketone through direct catalytic dehydrogenation of alcohol, so that preparation of aldehyde and / or ketone through direct catalytic dehydrogenation of alcohol is realized. The amorphous HAP coating layer on the active metal Me not only can avoid aggregation and growth of metal particles in the reaction process, but also can stabilize the overall structure of the catalyst, so that the catalyst disclosed by the invention has excellent stability, high alcohol conversion rate, high aldehyde ketone selectivity and long catalytic life in the direct catalytic dehydrogenation reaction; good industrial application prospects are realized.

This invention relates to the field of methane catalytic cracking for hydrogen production, and particularly to a glucose-modified activated carbon composite material, its preparation method, and its application. In this invention, activated carbon and glucose are used as the main raw materials, and a glucose-modified activated carbon catalyst is prepared through an impregnation-carbonization process. During carbonization, glucose gradually melts, dehydrates, and cracks to form carbonaceous intermediates. Simultaneously, gases such as H2O, CO, and CO2 are released. These gases activate the pore structure of the activated carbon, promoting the development of micropores and mesopores. Furthermore, the intermediates interact with the activated carbon surface, increasing the content of oxygen-containing functional groups, especially C=O-related functional groups. The resulting fluffy carbon black after glucose carbonization further enhances the initial activity during the methane catalytic cracking reaction and extends the catalytic life.

The present invention discloses a preparation method and application of an OP bidentate imine vanadium complex, and belongs to the technical field of olefin polymerization catalysts. The vanadium complex provided by the present invention is used as a main catalyst, and under the activation of a small amount of a co-catalyst, can catalyze the homopolymerization of ethylene, and has the advantages of high catalytic activity, good thermal stability, long service life, and applicability to a variety of solvent systems; it catalyzes the copolymerization of ethylene and α-olefins, and can obtain a polymer product with a high comonomer content with ultra-high activity catalysis; at the same time, the metal complex can also catalyze the copolymerization of ethylene and a hydroxyl-containing polar monomer to obtain a functionalized polyolefin product.

[Task] To provide a platinum-loaded alumina catalyst with an improved catalyst life. [Solution] A platinum-loaded alumina catalyst includes an alumina carrier, and platinum loaded on the alumina carrier, wherein the alumina carrier includes a γ-alumina carrier having a surface area of 200 m2 / g or more, a pore volume of 0.50 m2 / g or more, an average pore diameter in a range of 60 to 150 Å, with pores having a pore diameter in a range of ± 30 Å from the average pore diameter occupying 60 % or more of a total pore volume, platinum particles are loaded on γ-alumina carrier in a range of 0.1 to 1.5 % by weight calculated as elemental platinum (Pt), and 70 % or more of the platinum particles have a size of 8 to 15 Å by direct observation using a transmission electron microscope.

The present application provides a metallocene compound, and a preparation method and application thereof. The metallocene compound of the present application includes a structure as shown in Formula a, where Ar is selected from a substituted or unsubstituted C6-C30 aryl; Cp' is selected from a substituted or unsubstituted cyclopentadienyl, indenyl, or fluorenyl; X is at least one of halogen, substituted or unsubstituted C1-C30 alkyl, alkoxy, substituted or unsubstituted C2-C30 dialkylamino, alkenyl, or substituted or unsubstituted C6-C30 aryl; and M is a transition metal element. The metallocene compound is suitable for catalyzing a C6-C30 long straight chain α-olefin raw material and also a mixed long branched chain non-terminal olefin raw material, and may obtain a polymerization product with a target molecular weight according to demand.

The present invention provides a composite oxide solid base catalyst and a preparation method thereof and application thereof in the preparation of biodiesel. The composite oxide solid base catalyst uses halloysite as a carrier, nano nickel oxide and nano lanthanum oxide as active components, the mass ratio of the carrier to the active component is 1: (0.5-1), and the mass ratio of the nano nickel oxide to the nano lanthanum oxide in the active component is 1: (0.1-0.5). Nickel nitrate hexahydrate and lanthanum nitrate hexahydrate are ultrasonically dispersed in water, and added to a mixture of purified halloysite powder and water, stirred at 50-70°C for 6-12h, centrifuged and dried after stirring, and the obtained product is calcined and activated to obtain a composite oxide solid base catalyst. The composite oxide solid base catalyst of the present invention has good catalytic activity and high reaction yield when used in the preparation of biodiesel, and is easy to recover and reuse. It can still maintain strong catalytic activity after repeated use and has a long catalytic life.

The invention relates to an activated alumina ball, a preparation method and application of the activated alumina ball in sewage treatment, and relates to the technical field of alumina balls. The activated aluminum oxide ball comprises a ceramic matrix, an activated aluminum oxide layer and a hydrophobic layer which are sequentially arranged from inside to outside, the preparation process comprises the steps of ceramic matrix preparation, intermediate product preparation, vapor deposition of the hydrophobic layer and post-treatment. The silicon dioxide hydrophobic layer is additionally arranged on the outer layer of the prepared activated aluminum oxide ball, direct contact between a water phase and a chemical medium and active components is isolated, the structural protection stability is enhanced, and the prepared activated aluminum oxide ball has a good industrial application prospect in the field of sewage treatment.

The invention provides a synthesis method and application of an H-shaped slice high-silicon mordenite molecular sieve, and belongs to the technical field of molecular sieve synthesis and application. The preparation method comprises the following steps: mixing tetraethylammonium hydroxide and long-chain pyrrolidinium salt as template agents with an alkali source, an aluminum source and a seed crystal to form silicon-aluminum sol, aging the silicon-aluminum sol, carrying out a crystallization synthesis reaction, and carrying out ammonium ion exchange, drying and roasting to obtain the H-type high-silicon slice mordenite molecular sieve (MOR). According to the synthesized H-shaped sheet high-silicon mordenite molecular sieve, the Al element is enriched in an eight-membered ring of an MOR zeolite molecular sieve skeleton structure, acid sites which are subjected to side reactions in HMOR can be effectively shielded, and the H-shaped sheet high-silicon mordenite molecular sieve has good catalytic activity and product selectivity when being applied to a reaction for synthesizing methyl acetate through carbonylation.

The present application discloses a method for improving the conversion rate of tert-dodecyl mercaptan by using a catalyst, and relates to the field of catalytic technology. The method comprises the following steps: S1: loading a spherical solid acid catalyst into a reactor, uniformly mixing hydrogen sulfide and carbon dodecene in a molar ratio of 4 to 10:1, obtaining a mixed solution containing microbubbles, and then transferring the mixed solution into a reactor, wherein the internal pressure of the reactor is set to 1 to 8 MPa, and the reaction temperature is set to 50 to 220°C, so as to react and obtain a synthetic gas liquid after the reaction; S2: passing the synthetic gas liquid through a separation device, and hydrogen sulfide through a circulation device, and entering the next round of reaction, forming a hydrogen sulfide gas phase circulation, and tert-dodecyl mercaptan is collected in a product tank. The method adopted in the present application continues to operate for a long time, and carbon dodecene still maintains a good conversion rate, thereby improving the yield of tert-dodecyl mercaptan.

The invention discloses a preparation method of a nanoscale CHNU-1 molecular sieve with controllable morphology orientation, which is characterized in that a compound containing at least one element of heteroatoms B, Ga, Fe, P, Sn and Ti is used as a heteroatom source, at least one of fumed silica, silica gel, amorphous silicon oxide, tetraethyl orthosilicate, silica sol, a silicon-based molecular sieve and silicate is used as a silicon source, and the nanoscale CHNU-1 molecular sieve with controllable morphology orientation is prepared through a hydrothermal method. The preparation method comprises the following steps: uniformly mixing a heteroatom source, a silicon source and deionized water, adding a template agent and a crystallization auxiliary agent, crystallizing in a reaction kettle, and roasting a crystallized sample in an air atmosphere to obtain a target product. The method can directly prepare the hydrogen-type molecular sieve through controllable growth under the working conditions that alkali metal ions such as Na < + > are not introduced, the process is simple, the synthesis efficiency is high, and the obtained sample can be directly used as a catalyst and has great application potential.

The invention discloses a modified platinum-based catalyst for CO normal-temperature catalytic oxidation and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the modified platinum-based catalyst comprises the following steps: modifying an aluminum-based carrier by using a manganese metal compound solution to obtain a manganese modified aluminum-based carrier; loading platinum on the manganese modified aluminum-based carrier to obtain a platinum-loaded manganese modified aluminum-based carrier; and carrying out water vapor auxiliary treatment on the platinum-loaded manganese modified aluminum-based carrier to obtain the modified platinum-based catalyst for CO normal-temperature catalytic oxidation, the manganese metal compound solution comprises a manganese source and a urea solution. The catalyst is simple in preparation process and can be industrially produced in batches. The catalyst can be used for CO catalytic oxidation at normal temperature, the catalytic life is as long as 190 hours, a solution is provided for CO removal at normal temperature, and possibility is provided for wide application of gas masks.

The present invention belongs to the field of energy and environmental catalysis, and specifically relates to a high-performance aluminum-nickel-lanthanum catalyst for the methanation of carbon dioxide and a preparation method thereof. The present invention firstly utilizes a high-speed and high-pressure gas atomization process to prepare an aluminum-nickel-lanthanum alloy powder, and then selectively removes some Al atoms therein to prepare a high-thermal-conductivity spherical catalyst particle powder having micron-nano through-hole structure characteristics, which has excellent carbon dioxide methanation catalytic performance and catalytic life under mild reaction conditions of normal pressure and 220°C. The raw materials used for preparing the catalyst provided by the present invention are low-cost and easy to obtain, the preparation method is simple and efficient, and is suitable for large-scale process production operations, and has broad industrial application prospects and significant application value.

The invention relates to an electro-catalytic composite electrode and a preparation method and application thereof, and the electro-catalytic composite electrode comprises a main electrode, a magnet located on one side of the main electrode, and magnetic composite metal oxide particles located on the other side of the main electrode. The magnetic composite metal oxide particles are adsorbed on the surface of the main electrode through the magnetic action of the magnet; the chemical formula of the magnetic composite metal oxide particles is FeaCobMcO4, and M is Cr, Mn, Ni or Cu. The electrocatalytic composite electrode has good electrocatalytic activity and stability and long catalytic life, the preparation process is simple, the cost is low, and the electrocatalytic composite electrode has wide market application prospects when applied to electrocatalytic nitrate reduction synthesis ammonia reaction.

The invention discloses a catalyst for co-production of dimethyl carbonate and monomethyl malonate as well as a preparation method and application of the catalyst. The catalyst comprises rhodium nanoparticles and a grafted ionic liquid coupling agent. When the catalyst is used for a coupling reaction of preparing dimethyl carbonate by decarbonylation of dimethyl oxalate and preparing monomethyl malonate by carbonylation of methyl glycolate, the modified rhodium nanoparticles can be uniformly dispersed in a liquid-phase reaction raw material, so that quasi-homogeneous catalysis is realized, CO generated by decarbonylation can be supplied to carbonylation reaction, the atom utilization rate is increased, and the cost is reduced. And the CO generated in situ can reduce the activation energy required by the carbonylation reaction, so that the reaction temperature is lower, the selectivity is higher, and the catalytic life of the decarbonylation reaction is prolonged.

The invention provides a diimine catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst synthesis. The diimine catalyst has a structural formula as shown in a formula (I), wherein M is Ni or Pd; x is Br or Cl; r is selected from R2 and represents a connection site; r1 is selected from any one of a C6-C30 aryl group and a C1-C8 saturated or unsaturated alkyl group; r2 is selected from any one of a substituted or unsubstituted alkyl group with 1 to 12 carbon atoms, a substituted or unsubstituted naphthenic oxygen group with 2 to 12 carbon atoms, and a substituted or unsubstituted aryl group with 6 to 30 carbon atoms; and when the substituted or unsubstituted groups have substituent groups, the substituent groups are selected from one or more of halogen and C1-C12 alkyl groups. The diimine catalyst provided by the invention has good catalytic activity and stability by inhibiting ligand rotation.

The invention provides a synthesis method and application of an H-type high-silicon-wafer-shaped MOR zeolite molecular sieve, and belongs to the technical field of synthesis and application of molecular sieves. The method comprises the following steps: adding an aluminum source into a mixed solution containing an alkali source, tetraethylammonium hydroxide, long-chain bipiperidine onium salt and water to form slurry, adding a silicon source and a small-grain MOR zeolite molecular sieve seed crystal into the slurry, uniformly mixing to obtain silicon-aluminum sol, aging the silicon-aluminum sol, carrying out a crystallization synthesis reaction, carrying out ammonium ion exchange on the obtained crystallization product, and drying to obtain the small-grain MOR zeolite molecular sieve. And filtering, washing, drying and roasting to obtain the H-type high-silicon-wafer-shaped MOR zeolite molecular sieve. According to the molecular sieve synthesized by the invention, the Al element is enriched in an eight-membered ring of an MOR zeolite molecular sieve skeleton structure, the quantity of B acid in the eight-membered ring is increased, and the molecular sieve has a small-grain morphology feature structure, can effectively shield acid sites in side reaction in HMOR, is applied to a reaction for synthesizing methyl acetate by carbonylation of dimethyl ether, and has a good application prospect. The catalyst has the advantages of high catalytic activity, good product selectivity, simple preparation process and easy industrial amplification.