124 results about "Hydrogenolysis" patented technology

The invention discloses a dechlorination regeneration method of a chlorine poisoning noble metal catalyst and an application of the regenerated noble metal catalyst in polyolefin hydrogenolysis, and the dechlorination regeneration method comprises the following steps: dispersing the chlorine poisoning noble metal catalyst in water, adding a strong nucleophilic reagent for treatment, and carrying out centrifugal separation, washing and drying treatment to obtain the chlorine poisoning noble metal catalyst. The regenerated noble metal catalyst is obtained. A strong nucleophilic reagent dechlorination regeneration strategy under a room temperature mild condition is provided, chemically inert metal-chlorine bonds are broken through a nucleophilic substitution effect, noble metal particles are prevented from being agglomerated and sintered while deep dechlorination is realized, polyolefin hydrogenolysis activity of the catalyst can be completely recovered, activity improvement can be realized, and the catalyst has a good application prospect. Meanwhile, the regeneration cost is greatly reduced, and the regenerated noble metal catalyst can be used for efficiently hydrogenolyzing, upgrading and recycling waste polyolefin to obtain liquid alkane fuel with high additional value.

The invention provides a mesoporous silicon-aluminum molecular sieve catalyst, a preparation method and application thereof, and a polyolefin plastic catalytic hydrogenolysis method. The mesoporous silicon-aluminum molecular sieve catalyst comprises a carrier and an active component loaded on the carrier, the carrier comprises a mesoporous silicon-aluminum molecular sieve, and the active component comprises at least one of ruthenium, rhodium and platinum; the total mass of the mesoporous silicon-aluminum molecular sieve catalyst is 100%, the mass content of the active component is 3-7%, and the mass content of SiO2 in the mesoporous silicon-aluminum molecular sieve is 5-28%; the mass ratio of SiO2 to Al2O3 in the mesoporous silicon-aluminum molecular sieve is 0.06 to 0.4. The catalyst can realize high-activity and high-selectivity catalytic hydrogenolysis of polyolefin plastic under mild conditions.

The present application relates to the technical field of carbon material preparation, and particularly relates to a preparation method of nitrogen-doped ultrathin nanosheet support microspherical carbon material. The preparation method of the microspherical carbon material comprises the following steps: mixing gallium salt, zinc salt, carbon precursor, amine compound and water, and performing a solvothermal reaction to obtain deep red powder solid; and then performing calcination on the deep red powder solid in an inert atmosphere, and performing acid washing, water washing and drying to obtain the microspherical carbon material. The residual template agent after calcination can be removed completely by using dilute hydrochloric acid, thereby avoiding the use of strong corrosive reagents such as HF, KOH or NaOH. The method realizes batch production of the synthesis of the nitrogen-doped ultrathin nanosheet support microspherical carbon material, is simple to operate, stable in process, and regular in product morphology, and the amount of gallium salt and amine compound is reduced. The Pd(OH)2 / C catalyst prepared by using the material as a carrier shows excellent catalytic activity in the hydrogenolysis debenzyl reaction of a cage-shaped substrate.

The invention relates to a method for preparing dihydric alcohol by hydrogenolysis of polyhydric alcohol, the hydrogenolysis process of the polyhydric alcohol is carried out in the presence of a supported catalyst, the catalyst carrier is formed alumina, and the active component is Pt metal and an auxiliary agent A thereof; the auxiliary agent A is one or more than two of Mo, Fe, La, Ce, Sn, Zr, Zn, W, Al, Ga, Mn, Nd and Ta, and the loading capacity of the auxiliary agent A is 0.01%-15% by mass of Al2O3. Compared with the prior art, the selectivity of 1, 3-propylene glycol prepared by hydrogenolysis of glycerin and the like can be improved, the glycerin conversion rate can be increased, the reaction pressure window can be widened, and the stability can be improved.

The invention discloses a method for preparing propylene glycol by hydrogenolysis of glycerol, and belongs to the technical field of propylene glycol preparation. In a hydrogen electrolytic tank, a three-electrode system is adopted, a reference electrode is an Ag / AgCl electrode, a counter electrode is a platinum sheet electrode, a working electrode is a CuAg-TiN electrode, the working electrode and the counter electrode are separated by a proton exchange membrane, and electrolyte is filled; and adding trimethylolpropane as an additive, and adding glycerol at the cathode for reaction to obtain the 1, 3-propylene glycol. According to the method, reaction is realized at normal temperature and normal pressure, hydrogen is not used, and active hydrogen generated by in-situ electrolysis of water reacts with glycerol, so that high-selectivity production of propylene glycol is realized, and the whole reaction process is mild in condition, low in cost and good in stability.

The application provides a device and method for producing succinic acid by oxidizing and hydrolyzing butane and / or benzene as raw materials, the device comprising: an oxidation separation system, a maleic anhydride hydrogenation separation system and a succinic anhydride hydrolysis system connected in series along the material flow direction; wherein butane and / or benzene and oxygen-containing gas are subjected to oxidation reaction in the oxidation separation system and separated to obtain maleic anhydride material; the maleic anhydride material enters the maleic anhydride hydrogenation separation system to perform hydrogenation reaction and is separated to obtain succinic anhydride; and the succinic anhydride enters the succinic anhydride hydrolysis system to perform hydrolysis and crystallization, thereby obtaining succinic acid product. The application provides a process for producing succinic acid from butane / benzene for enterprises with butane or benzene resources, and the application preferably adopts two-stage hydrogenation reactors and circulates part of the material at the outlet of the second reactor to the first reactor, so that the content of maleic anhydride in the first reaction feed can be effectively diluted and the reaction heat generated in the first reaction can be taken away due to the fact that the material does not contain maleic anhydride.

This invention relates to the field of chemical hydrogen storage, and discloses a carbon-based catalyst, its preparation method and application, and a method for the dehydrogenation of methylcyclohexane. The catalyst comprises nitrogen (N), carbon (C), hydrogen (H), and platinum nanoparticles; the catalyst has the following properties: "Pt x C y N z H a The schematic chemical composition of the catalyst is shown in the figure, where z:a = 1.5~5; z:x = 5~50; z:y < 0.016; in the catalyst, nitrogen atoms are covalently bonded to at least two carbon atoms; nitrogen atoms are covalently bonded to hydrogen atoms; the carbon tetrachloride adsorption value (CTC) of the catalyst is ≥80%; in the XRD spectrum of the catalyst, the A of the Pt(111), (200), (220), (222) crystal plane diffraction peaks of the platinum nanoparticles is ≥85%, and A = (Pt(111) peak area) / (peak area of ​​Pt(111) + peak area of ​​Pt(200) + peak area of ​​Pt(220) + peak area of ​​Pt(222))) × 100%. This catalyst has good catalytic activity and low hydrogenolysis activity, making it particularly suitable for dehydrogenation reactions, such as the dehydrogenation reaction of alkyl-substituted cycloalkanes. It can effectively control the hydrogenolysis reaction during the dehydrogenation process and reduce the generation of by-products. It is especially suitable for the application of methylcyclohexane dehydrogenation reaction. After the dehydrogenation reaction, the conversion rate of methylcyclohexane is high, and the methane content in the product is <0.3wt%.

A process for producing 1,4-cyclohexanedimethanol by depolymerizing one or more recycled terephthalate-based polyesters or copolyesters via solvolysis with one or more glycols or alcohols and contacting the depolymerization product with an ester hydrogenolysis catalyst and hydrogen to produce a hydrogenolysis product and contacting the hydrogenolysis product with a hydrogenation catalyst and hydrogen to produce 1,4- cyclohexanedimethanol.

This invention relates to the field of biomass degradation technology, specifically to a ruthenium-based catalyst Ru@RuO2 supported by zirconium phosphate, its preparation method, and its application in catalyzing the hydrogenolysis of lignin. This invention is based on the in-situ reduction of elemental ruthenium to needle-like ruthenium oxide supported by amorphous zirconium phosphate, constructing a RuO2 / zirconium phosphate composite nanomaterial. This material can efficiently catalyze the hydrogenolysis of alkali-degraded lignin and model compounds such as α-O-4 and 4-O-5. Furthermore, the ruthenium nanoparticles generated from the in-situ reduction on ruthenium oxide exhibit high stability and can be reused multiple times.

The application discloses a synthesis method of 2-piperidinemethanol and belongs to the technical field of organic synthesis. The method takes biomass derivative 2,5-dihydroxymethylfuran as raw material, adds a supported bimetallic catalyst, a solvent and an ammonia source, and reacts under the condition of 0.1-8 MPa H2 pressure and 80-230 DEG C for 0.3-10 h, so as to obtain the target product 2-piperidinemethanol through one-pot selective hydrogenolysis-amination two-step coupling reaction. The active metal of the catalyst is any two of Ni, Co, Cu, Ru, Pd, Pt and Rh, and the total metal loading is 2wt%-30wt%. The raw material is renewable, the reaction condition is mild, the product selectivity is high (up to 85%), the catalyst is stable and easy to recover, the repeated use performance is good, the process route is simple and easy to enlarge, the method solves many drawbacks of the traditional synthesis method, realizes the green and efficient synthesis of 2-piperidinemethanol, and has wide application prospect in the fields of drug synthesis, environmental protection and catalysis.

The invention belongs to the technical field of high-value utilization of waste plastics and preparation of lubricating oil. According to the method for preparing the lubricating oil through hydrogenolysis of the polypropylene waste plastics, a supported non-noble metal-metal oxide catalyst is adopted to catalyze hydrogenolysis of the polypropylene waste plastics to prepare the lubricating oil in the absence of a solvent. According to the method disclosed by the invention, the polypropylene waste plastic can be converted into the high-value lubricating oil under low-cost and mild conditions, the problem of waste plastic pollution can be solved, and meanwhile, green and multi-way preparation of the lubricating oil can be realized.

The invention discloses a detoxification process before conversion of organic poison-containing semi-coke tail gas. The system equipment comprises a heat exchange module 1, a hydrogenation protector, a hydrogenation detoxification device, a dechlorination device, a hydrogenation dechlorination device, a heat exchange module 2 and a shift reactor. The method comprises the following steps: preheating semi-coke tail gas through a heat exchange module 1, introducing the semi-coke tail gas into a hydrogenation protector for pre-detoxification, simultaneously carrying out hydrogenolysis and detoxification on organic poison through a hydrogenation detoxification device, carrying out dechlorination through a dechlorination device, and further hydrogenolysis and removal of organic chlorine in the hydrogenation dechlorination device. The obtained clean semi-coke tail gas is subjected to heat exchange through the heat exchange module 2 and then enters the conversion module. According to the detoxification conversion process, toxicants in the semi-coke tail gas are fully identified, corresponding removal steps and measures are adopted, the problems that the conversion rate of a conversion catalyst is reduced and the longest service life is less than one year due to incomplete removal of impurities such as chlorine and arsenic in the existing semi-coke tail gas purification process can be effectively solved, the continuity and stability of device operation are effectively improved, and the service life of the device is prolonged. The economic benefit is obvious.

The invention provides a preparation method and application of a monatomic catalyst for preparing 1, 3-propylene glycol through high-selectivity hydrogenolysis of glycerol. The catalyst is composed of active metal, a metal oxide auxiliary agent A and a carrier. The active metal is Pt, and the metal oxide auxiliary agent A is one or two or more of niobium oxide, tantalum oxide, molybdenum oxide and tungsten oxide. The composition and proportion of the monatomic catalyst are accurately regulated and controlled through a strong electrostatic adsorption method, 1, 3-propylene glycol is prepared through efficient catalysis of selective hydrogenolysis of glycerin, the yield of 1, 3-propylene glycol in a high-concentration glycerin solution (50 wt%) reaches up to 0.43 g of 1, 3-propylene glycol g of the catalyst h <-1 >, and excellent stability is achieved. The method has the advantages that the catalyst is simple and convenient to prepare and low in cost, the precious metal atom utilization rate is 100%, recovery is easy, products are easy to separate, and the reaction process is environment-friendly. According to the technical scheme, the invention provides a novel preparation method and application of the monatomic catalyst for preparing 1, 3-propylene glycol through efficient hydrogenolysis of glycerol, and the monatomic catalyst has an excellent application prospect.

This invention belongs to the field of catalytic materials technology, and discloses a NiCo nanosphere alloy catalyst material, its preparation method, and its application. The invention involves dissolving nickel nitrate, cobalt nitrate, and anhydrous sodium acetate in ethylene glycol and stirring vigorously until homogeneous. The homogeneous solution is then transferred to a polytetrafluoroethylene (PTFE) reactor and reacted at an ambient temperature of 25–350°C for 1–120 h. The reaction product is washed, centrifuged, and the resulting pale blue precipitate is dried. The dried pale blue precipitate is then reduced in a tube furnace to obtain a NiCo alloy catalyst material with a nanosphere structure. The synthesis process of this NiCo alloy catalyst material is simple and the conditions are mild. When used for the catalytic hydrogenolysis of lignin to high-value aromatic monomers, the obtained catalyst material exhibits high selectivity for aromatic monomers, and its catalytic performance is comparable to commercially available noble metal catalysts, representing a significant breakthrough in replacing noble metals with inexpensive transition metals.

The application discloses a synthesis process of (-)-alpha-lycorane alkaloid and belongs to the technical field of organic synthesis chemistry. (2Z,4E)-7,7-diethoxy-3-hydroxyhepta-2,4-dienoic acid methyl ester and 3,4-methylenedioxy-beta-nitrostyrene are used as starting materials, and (-)-alpha-lycorane is obtained through catalytic asymmetric tandem Michael addition reaction, nitro reduction amination reaction, Boc amidation reaction, Bischler-Napieralski cyclization reaction, ketone enolization tandem esterification reaction, enol triflate reductive hydrogenolysis reaction and amide reduction reaction in sequence. (-)-Alpha-lycorane has a four-membered ring core skeleton of pyrrole-phenanthridine ring, has good in-vitro tumor inhibition activity and cell proliferation growth inhibition activity. The synthesis process can realize efficient, simple and full synthesis of (-)-alpha-lycorane.

[Problem] To perform selective hydrogenolysis of a cyclic compound that has a five-membered ring structure and that is included in a saturated cyclic compound used as a hydrogen carrier. [Solution] A metal catalyst used in hydrogenolysis of a cyclic compound that has a five-membered ring structure and that is included in a saturated cyclic compound used as a hydrogen carrier, comprises: a silica-based carrier as a catalyst carrier; and iridium or rhodium as a metal supported on the catalyst carrier.

The application discloses a high-activity Ni-Ca bimetallic catalyst and a preparation method and application thereof. The catalyst takes NiCa hydrotalcite as a precursor, and a supported high-dispersion Ni-Ca bimetallic catalyst is prepared through calcination reduction. The high-dispersion catalyst NiCa / Al2O3 exhibits excellent catalytic performance in the aryl ether hydrogenolysis and in-situ deoxygenation reaction of coal and model compounds thereof, can highly actively and selectively crack aryl ether bonds in coal extract residues and coal related model compounds under mild conditions, and can perform in-situ deoxygenation on oxygen-containing compounds obtained after the aryl ether bonds are cracked without hydrogenating aromatic rings, and highly selectively obtains platform chemicals, i.e. aromatic hydrocarbon compounds. The catalyst preparation method is simple, has good stability, and has a good application prospect in the catalytic hydrogenation conversion of medium and low rank coal under mild reaction conditions.

A method of preparing a calcined hydrogenolysis / hydrogenation catalyst includes mixing a copper-containing material, manganese-containing material, sodium aluminate, and water to obtain an aqueous slurry; contacting the aqueous slurry with a caustic material to form a precipitate in a caustic aqueous slurry; removing the precipitate from the caustic aqueous slurry; and removing residual water from the precipitate to form a dried precipitate; calcining the dried precipitate to form the calcined hydrogenolysis / hydrogenation catalyst exhibiting a Brunauer-Emmett-Teller (“BET”) surface area of about 5 m2 / g to about 75 m2 / g. The calcined hydrogenolysis / hydrogenation catalyst may include a spinel structure crystallite size of about 15 nm or less. The calcined hydrogenolysis / hydrogenation catalyst may include a tenorite crystallite size of about 20 nm to 30 nm.

The invention relates to the field of hydrogenation catalysts, and discloses a preparation method of a hydrogenation catalyst, the hydrogenation catalyst and application thereof, and a production method of an aromatic extraction raw material. The invention relates to a preparation method of a hydrogenation catalyst, which comprises the following steps: (1) loading nickel and alkali metal and / or alkaline earth metal onto a carrier, and then roasting to obtain a modified carrier; (2) loading cobalt, molybdenum and a first organic matter on the modified carrier, and then carrying out hydrothermal treatment and first post-treatment to obtain a catalyst precursor; and (3) loading a second organic matter on the catalyst precursor, and then carrying out hydrogenolysis post-treatment to obtain the catalyst. According to the method, the loading sequence of the active metal is modulated, the stability of the catalyst is improved, the electronic characteristic adjusting effect of alkali metal is utilized, and organic matter is introduced while the active metal is subsequently impregnated, so that the active metal can be better dispersed on a carrier, and better combination between the active metal is realized.

This invention discloses a method for the kinetic resolution of oxaspirone via organocatalytic hydrogenolysis. Using chiral phosphate CPA as a catalyst, Hantzsch ester as a hydrogen source, and racemic oxaspirone 2,4-dien-6-one rac-1 as a substrate, a series of axially chiral biaryl phenolic compounds 2 are synthesized via asymmetric hydrogenolysis, and the central chiral oxaspirone 1 is recovered. This invention offers advantages such as simple and practical operation, readily available raw materials, high resolution coefficient, and good enantioselectivity. Some of the axially chiral biaryl products have structures similar to axially chiral cannabinol, possessing potential medicinal value.

The invention discloses a catalyst as well as a preparation method and application thereof, and belongs to the technical field of chemical engineering. The method comprises the following steps: obtaining a solution containing a first active substance, wherein the solution comprises a first solution containing a titanium-based complex and / or a second solution containing a copper-based complex; reacting the titanium-based precursor, a complexing agent and water to obtain a first solution containing a titanium-based complex; reacting the copper-based precursor, a compounding agent and water to obtain a second solution containing a copper-based complex; mixing a ZSM molecular sieve, a cerium source, an acidic modifier and a solvent to obtain a third solution; adding a regulating agent into the third solution, and performing primary roasting to obtain a carrier loaded with the regulating agent; and mixing the carrier and the solution containing the first active substance to form a mixture, carrying out molding treatment on the mixture, and carrying out secondary roasting to obtain the catalyst. The catalyst provided by the invention can improve the catalytic activity and selectivity of a cyclized product, is long in service life, can be used repeatedly and is simple to recover, and the selectivity of the catalytic performance of selective hydrogenolysis of a C-O-C bond into linear alcohol reaches 98% or above.

The present invention relates to a catalyst. The catalyst comprises a nitrogen-doped carbon-based carrier loaded with platinum metal particles existing in the form of a zero-valent element, wherein the doping nitrogen comprises more than 40% to 80% of nitrogen atoms simultaneously connected to three carbon atoms via chemical bonds, and 0% to 1% of nitrogen atoms connected to oxygen atoms via chemical bonds; and on the basis of the total weight of the catalyst, the catalyst comprises 0.1 wt.% to 2 wt.% of the doping nitrogen, and 0.1 wt.% to 1.5 wt.% of the platinum metal particles. The present invention further relates to a preparation method for the catalyst and the use of the catalyst in a dehydrogenation reaction. The catalyst of the present invention has a good dehydrogenation activity and a low hydrogenolysis activity.

Provided is a process for hydrogenolysis of a polymer that includes providing in a reactor the polymer, hydrogen gas and a supported organometallic catalyst. The supported organometallic catalyst formed from an organometallic complex precatalyst and an acidic metal oxide support. The polymer is reacted with the supported organometallic catalyst in the presence of the hydrogen gas at a predetermined temperature in the reactor to produce a reduced polymer product having a weight average molecular weight less than the polymer.

The invention discloses a preparation method of a nickel-based catalyst for chemical recovery of waste plastics, which comprises the following steps: adding a molybdenum metal precursor and aluminum oxide into a grinding bowl according to a predetermined mass ratio, adding an organic compound and a solvent at the same time, and grinding and drying the mixture; crushing the dried precursor into powder, transferring the powder into a high-temperature tubular furnace, and performing high-temperature calcination in a protective atmosphere to obtain a molybdenum-containing precursor; the preparation method comprises the following steps: dispersing a molybdenum-containing precursor into deionized water, putting into a flask, adding a nickel metal precursor and an organic compound, and stirring at a preset temperature; sealing the flask, replacing gas in the flask with protective gas, adding a reducing agent, continuously stirring at a preset temperature, then stopping stirring, adding a stabilizing reagent, and standing; and separating and drying the obtained solid to obtain the nickel-based catalyst. The cost of the catalyst in waste plastic hydrogenolysis recovery is greatly reduced, and the catalyst has good catalytic performance and stability and is completely suitable for the large-scale waste plastic chemical recovery industry.

The invention discloses a method for preparing methane by aqueous-phase one-step mild hydrogenolysis of cellulose biomass, and belongs to the technical field of biomass methanation. According to the method, cellulose biomass is used as a raw material, water is used as a solvent, methane is obtained through hydrogenolysis under the action of a non-noble metal supported catalyst, the non-noble metal is any one of Ni, Fe, Co or Cu, and a carrier is anatase TiO2 with different crystal faces, namely TiO2-{101}, TiO2-{100} and TiO2-{001}. Under the action of the non-noble metal-based catalyst, the cellulose is converted into methane through one-step mild hydrogenolysis, the used catalyst is low in price, the preparation method is simple, the activity is high, the condition is mild, and the product selectivity is high.

A method for depolymerizing a polyester may comprise heating a polyester at a temperature and for a period of time in the presence of a supported metal-dioxo catalyst, optionally, in the presence of H2, to induce hydrogenolysis of ester groups in the polyester and provide monomers of the polyester.

The invention relates to the technical field of ammonia borane hydrolysis hydrogen desorption, and provides an ammonia borane hydrolysis catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing a graphene aerogel electrode; preparing an electrolyte comprising a phosphorus-containing compound and a transition metal compound according to a preset proportion; the graphene aerogel electrode and the electrolyte are subjected to an electro-deposition reaction under preset conditions, and the ammonia borane hydrolysis catalyst is obtained. According to the scheme, the problems that high-temperature and high-pressure conditions are needed in the existing catalyst preparation process and the green chemical principle is not met can be solved.

The application provides a titanium dioxide type low-temperature hydrogenolysis catalyst and a preparation method and application thereof. The catalyst comprises a titanium dioxide carrier and an active component loaded on the titanium dioxide carrier, and the active component comprises scandium oxide and tungsten oxide. The preparation method of the catalyst comprises the following steps: dipping the titanium dioxide carrier in a mixed solution of scandium salt and tungsten salt for a period of time, so that the scandium salt and the tungsten salt are loaded on the titanium dioxide carrier; and then drying and calcining the titanium dioxide carrier loaded with the scandium salt and the tungsten salt, to obtain the titanium dioxide type low-temperature hydrogenolysis catalyst. The catalyst has good sulfur dioxide hydrogenation activity and organic sulfur hydrolysis activity, and can be applied to a process for treating sulfur recovery tail gas at a low temperature of 210-220 DEG C.

One or more reactants are flowed into thermal contact with a heating element in a reactor for a first time period. During a first part of a heating cycle, the one or more reactants are provided with a first temperature by heating with the heating element, such that one or more thermochemical reactions is initiated. The one or more thermochemical reactions includes pyrolysis, thermolysis, synthesis, hydrogenation, dehydrogenation, hydrogenolysis, or any combination thereof. The first heating element operates by Joule heating and has a porous construction that allows gas to flow therethrough. During a second part of the heating cycle, the one or more reactants are provided with a second temperature less than the first temperature, for example, by de-energizing the heating element. A duration of the first time period is equal to or greater than a duration of the heating cycle, which is less than five seconds.