305 results about "Hydrogenolysis" patented technology

The invention relates to a preparation method and application of a hydrothermal ammonolysis lignin carbon-based multi-metal catalyst. The Ni-N-C structure is constructed by a hydrothermal nitrogen doping method to enhance the synergistic effect of the catalytic active component and the lignin carbon-based carrier, and Zn is doped to regulate and control the electronic structure of Ni and effectively inhibit hydrogenolysis and methanation of carbon-carbon bonds in the reaction process, so that the catalytic activity of the catalyst and the selectivity of the product are improved. According to the catalyst obtained by the preparation method, the ethanol conversion rate can reach 69.4%, the yield of higher alcohols can reach 50.3%, the selectivity of gas byproducts is only 2.4%, the catalytic effect is good, and the problems that an existing traditional ethanol Guerbet coupling catalyst is low in ethanol conversion rate, tedious in synthesis process, poor in stability and the like can be effectively solved.

Provided is a method for producing chemical products, including: a pyrolysis step of obtaining a first gas fraction, a pyrolysis oil, and a residual fraction by pyrolysis of a crushed material of a waste material including waste tires; a hydrogenolysis step of obtaining a second gas fraction, a light fraction with a boiling point of 350° C. or lower, and a heavy fraction with a boiling point higher than 350° C. by hydrogenolysis of a raw material oil containing at least a part of the pyrolysis oil; and a steam-cracking step of obtaining a chemical product by steam cracking of a steam-cracking raw material oil containing at least a part of the light fraction.

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 invention discloses a liquid organic hydrogen storage material and application thereof, and belongs to the technical field of liquid hydrogen storage. The liquid organic hydrogen storage material is an organic compound with a diol structure, the organic compound with the diol structure is one of 1, 5-pentanediol, diethylene glycol and diethanol amine, the liquid organic hydrogen storage material is low in melting point, high in boiling point, safe and low in toxicity, hydrogen is generated through liquid-phase dehydrogenation lactonization, the available hydrogen content is about 3.8%, and the 1, 5-pentanediol structure is one of 1, 5-pentanediol, diethylene glycol and diethanol amine. The 1, 5-pentanediol can be prepared from a biomass platform compound furfural through hydrogenation and hydrogenolysis, and the source is rich; the diethylene glycol and the diethanol ammonia are bulk chemical products, easy to obtain and low in price, and the liquid organic hydrogen storage material has high industrial application value.

The invention relates to the technical field of catalysts, and discloses a foam structure catalyst and a preparation method and application thereof. The foam structure catalyst comprises a foam structure, metal M2, metal oxide M2Ox, heteropolyacid salt of the metal M2, optional tungsten oxide WOz1 and optional molybdenum oxide MoOz2, the metal M2, the metal oxide M2Ox and the heteropolyacid salt of the metal M2 grow on the foam structure, z1 is equal to 2-3, and z2 is equal to 2-3; wherein the heteropolyacid salt is selected from one or more of tungstate and molybdate, M2 is selected from one or more of Cu, Ni, Fe, Zn and Co, and x is equal to 0.5 to 1.5; the foam structure contains metals M1 and M1Oy, M1 is selected from one or more of foam iron, foam nickel and foam cobalt, and y is equal to 1-1.5. The foam structure catalyst can be used for stable hydrogenolysis of glucose, the glucose conversion rate stably reaches 100% in a continuous fixed bed reactor, and the selectivity of 1, 3-propylene glycol is larger than or equal to 55%, and the selectivity of ethyl alcohol is larger than or equal to 48%.

The invention relates to a method for preparing N-alpha-fluorenylmethoxycarbonyl-N-in-t-butyloxycarbonyl-L-tryptophan, which comprises the following steps: step 1, under the action of a first alkali, enabling L-tryptophan (L-Trp-OH) to react with 9-fluorenylmethyl-N-succinimido carbonate (FmocOSu), so as to obtain Fmoc-Trp-OH; step 2, enabling the Fmoc-Trp-OH to react with benzyl alcohol under the action of p-toluenesulfonic acid, so as to obtain Fmoc-Trp-OBzl; step 3, enabling the Fmoc-Trp-OBzl to react with Boc2O under the action of a second alkali, so as to obtain Fmoc-Trp (Boc)-OBzl; and step 4, carrying out hydrogenolysis reaction on the Fmoc-Trp (Boc)-OBzl under the catalysis of palladium carbon, so as to obtain the target compound Fmoc-Trp (Boc)-OH. All the raw materials in the method can be conveniently purchased on the market, and the method is simple in process route, mild in reaction condition, small in organic solvent dosage, less in separation operation, few in organic impurities, high in yield, high in purity and suitable for commercial production.

The invention discloses a dual-site single-atom catalyst and a preparation method thereof, which specifically comprises: loading metal Cu nanoparticles on a SiO2 carrier by an impregnation method to obtain Cu / SiO2; adding Cu / SiO2 to a metal oxide precursor solution, stirring and reacting under the protection of an inert gas, filtering, drying, and heat-treating to obtain a catalyst M1O x / Cu / SiO2; M1O x / Cu / SiO2 is added to the noble metal precursor solution, stirred and reacted under the protection of inert gas, filtered, dried, and heat treated to obtain M1O x ‑M'1 / Cu / SiO2, that is, a dual-site single-atom catalyst. The dual-site single-atom catalyst of the present invention can be used in the selective hydrogenolysis reaction of the C‑O bond of biomass polyols, which can greatly reduce the hydrogen pressure in the reaction and has high selectivity and good stability.

The invention discloses a method for preparing 4-propyl syringol by catalyzing hydrogenolysis of lignin through cobalt-nitrogen co-doped porous carbon. According to the method, organic soluble lignin is taken as a raw material, lignin-based cobalt-nitrogen co-doped porous carbon is taken as a catalyst, small molecular alcohol is taken as a reaction medium, stirring reaction is performed under the hydrogen pressure of 1-2MPa and at the temperature of 190-260 DEG C, and the organic soluble lignin is selectively hydrogenolyzed into a monophenol chemical mainly containing 4-propyl syringol; the catalyst disclosed by the invention does not need to be subjected to carrier preparation, impregnation and reduction, and also does not need to be subjected to mofs material preparation and roasting, so that the catalyst has obvious advantages in a catalyst preparation process; according to the catalyst, transition metal is used as catalytic active metal, and the metal is uniformly dispersed on the surface of the catalyst in a monatomic-level dispersion degree to form a complex with CoN4 as a main component with carbon and nitrogen; the catalyst is wide in raw material source, low in metal content and obvious in cost advantage, and has the advantage of large-scale production.

The invention discloses a method for preparing phenolic chemicals by using a cobalt-based nitrogen-carbon composite material to catalyze lignin transfer hydrogenolysis. According to the method, organic soluble lignin is taken as a raw material, a cobalt-based nitrogen-carbon composite material is taken as a catalyst, small organic molecule alcohol and formic acid are taken as a mixed solvent, the reaction temperature is kept at 210-250 DEG C, the reaction time is 2-6 hours under the inert gas atmosphere of 0.5-3 MPa, lignin depolymerization can be catalyzed to obtain a series of p-hydroxyphenyl products, and high-value utilization of lignin is realized. The conversion rate of the lignin reaches up to 89.6%, the total yield of monophenol products can reach 17.7%, the yield of p-hydroxyphenyl products reaches 9.0%, and the selectivity reaches 50.8%. The catalyst used in the invention is simple in preparation process, and can catalyze short-chain alcohol and carboxylic acid solvent hydrogen transfer depolymerization lignin under mild conditions to obtain high value-added chemicals such as p-hydroxyphenyl products and the like.

The invention discloses a preparation method and application of a catalyst for preparing hydrocarbon liquid fuel through grease hydrodeoxygenation, oxyphilic metal elements of tungsten, molybdenum, zirconium and zinc are introduced, oxyphilic metal salt and nickel salt are fully mixed with a carrier according to different proportions and then subjected to ultrasonic treatment, a solvent is subjected to vacuum rotary evaporation under the room temperature condition, and the catalyst is obtained. The supported nano nickel-based alloy catalyst is prepared by roasting at the temperature of 250-400 DEG C and reducing at the temperature of 650-690 DEG C, activation and breakage of C-O bonds of ester compounds under mild conditions are greatly enhanced, and hydrodeoxygenation conversion of the ester compounds under mild conditions is realized by utilizing a nickel metal center with high hydrogen dissociation activity. In addition, the hydrogenolysis side reaction of the nickel metal center to the liquid hydrocarbon product is inhibited, the excellent catalytic performance is shown, the reaction activity is high, the yield of the hydrocarbon target product is high, and the catalyst stability is good.

The invention discloses a Pd-based moving catalyst and a preparation method and application thereof.The preparation method comprises the steps that S1, a silicon source substance, a template agent and a microstructure regulating agent are added into an anhydrous solvent, ultrasonic treatment and stirring are conducted, and an organic phase is obtained; s2, dissolving an alkali substance in distilled water, and performing ultrasonic treatment and stirring to obtain a water phase; s3, dropwise adding the water phase into the organic phase, stirring, standing for reaction, centrifuging, washing and calcining to obtain a carrier; s4, dispersing the carrier in distilled water, and stirring to obtain a suspension; and S5, ultrasonically dissolving a Pd precursor in distilled water, adding the turbid liquid, stirring, dropwise adding an alkali solution to adjust the pH value, stirring and reacting in an alkaline environment, centrifuging to obtain a crude product, washing to be neutral, and drying to obtain the palladium-based moving catalyst. The Pd-based moving catalyst disclosed by the invention has high activity in an HBIW hydrogenolysis debenzylation reaction.

The invention discloses a method for preparing an aromatic hydrocarbon product by catalyzing hydrogenolysis of oxygen-containing plastic through Ru-based amorphous molybdenum oxide. The method comprises the following steps: by taking oxygen-containing plastic as a raw material, mixing the raw material, a Ru-based catalyst and an n-hexane solvent in a reaction kettle, reacting for 2-6 hours under the conditions that the H2 pressure is 0.5-2 MPa and the reaction temperature is 220-300 DEG C, and depolymerizing the oxygen-containing plastic to obtain an aromatic hydrocarbon product, the Ru-based catalyst is composed of a carrier MoO3 and an active component ruthenium. According to the method, the conversion rate of the oxygen-containing plastic can reach 99%, the total yield of aromatic hydrocarbon products can reach 66.9-85.7 mol%, the yield of p-xylene can reach 60.2-77.2 mol%, and the selectivity of p-xylene is 84.6%-94.1%. The catalyst used in the invention has the advantages of low raw material cost and simple preparation process, and can depolymerize the oxygen-containing plastic under mild conditions to obtain high value-added chemicals such as aromatic hydrocarbon products.

The invention discloses a method for preparing 2, 5-dimethylfuran through biomass conversion. The method comprises the following steps: (1) in the presence of a plurality of organic solvents, carrying out contact reaction on a biomass raw material and a solid acid catalyst to obtain an organic solution containing 5-hydroxymethylfurfural and a 5-hydroxymethylfurfural functional group partial passivation product; (2) the organic solution obtained in the step (1), hydrogen and a hydrogenolysis catalyst are subjected to a contact reaction, and 2, 5-dimethylfuran is prepared. The method has the advantages of high product selectivity, good catalyst stability and easy product separation, and realizes green and efficient conversion from biomass to 2, 5-dimethylfuran.

The invention provides a method for preparing 1, 2-pentanediol through selective hydrogenolysis of furfuryl alcohol, and the method can realize directional selective fracture of C-O bonds of furfural / furfuryl alcohol and efficient preparation of 1, 2-pentanediol. According to the method, a hemicellulose downstream product furfuryl alcohol in a biomass component is directly used as a raw material and is converted into 1, 2-pentanediol with a high added value. According to the method disclosed by the invention, the conversion rate of furfuryl alcohol can be 100% on the non-noble metal Cu-based catalyst, the selectivity of 1, 2-pentanediol reaches 71.5%, and the method has extremely high stability. The catalyst is simple and convenient to prepare, low in cost and easy to recover, the product is easy to separate, and the reaction process is green and environment-friendly. The technical scheme of the invention provides a new way for preparing 1, 2-pentanediol from renewable resources which are rich in reserves, low in price and easy to obtain, and the method has excellent application prospects.

The present invention provides a hydrogenation catalyst, which includes a carrier and a catalytic active component, wherein the carrier includes α-Al2O3 and MgO, and the active component includes a platinum element. The present invention uses alumina of a specific crystal form as a core, coats a basic oxide, forms a composite carrier, and then loads a precious metal on the composite carrier to obtain a hydrogenation catalyst. The hydrogenation catalyst is applied to the reaction of hydrogenation and hydrogenolysis of dibenzofuran to produce OPP, and has the characteristics of high OPP selectivity, few by-products, good stability, and long service life. The active precious metal in the hydrogenation catalyst is more dispersed on the surface of the carrier, reducing the amount of the precious metal component. The preparation process of the hydrogenation catalyst is simple and easy to mass produce. Therefore, the hydrogenation catalyst provided by the present invention has excellent prospects for industrial application.

The invention provides a preparation method of a Zn-Cr spinel oxide catalyst and application of the Zn-Cr spinel oxide catalyst in CO2-assisted ethane dehydrogenation, and relates to the technical field of composite catalysts. Wherein the Zn-Cr spinel oxide catalyst is prepared by firstly preparing a Zn1Crx oxide carrier by adopting a coprecipitation method and then loading Cr on the surface of the Zn1Crx oxide carrier by adopting an impregnation method, and in the process, strong metal-carrier interaction can be formed between the loading of Cr on the surface of the carrier and the Zn1Crx oxide carrier, so that the oxygen vacancy concentration on the surface of the catalyst is regulated and controlled and the desorption of ethylene is promoted; according to the present invention, the Zn1Crx carrier is used as the catalyst to inhibit the excessive oxidation of the Zn1Crx carrier so as to significantly improve the selectivity of ethylene, and the metal Cr forms the compact covering layer on the surface of the Zn1Crx carrier so as to reduce the number of the strong oxidation active sites, synergistically promote the rapid desorption of ethylene, and inhibit the occurrence of the side reactions such as dry reforming and hydrogenolysis.

The application provides a preparation method of a supported catalyst and belongs to the field of catalyst preparation. The preparation method comprises the following steps: loading tungsten and niobium on a carrier by using a hydrothermal method, and washing and drying to obtain a catalyst intermediate body loaded with NbO x and WO x ; loading a platinum precursor on the catalyst intermediate body, drying and calcining to obtain the catalyst. The application adopts the hydrothermal method to prepare the NbO x -WO x / Y catalyst intermediate body, which can not only uniformly disperse NbO x and WO x on the surface of the carrier and make the particle size very small, but also can reduce the Pt salt into metal Pt in the calcination process by using the carbon-based compounds with reducing property generated by the reducing agent under the hydrothermal condition, so that the obtained catalyst does not need to be reduced after calcination and can be directly used in the glycerol hydrogenolysis reaction.

The invention discloses a catalyst for preparing alkyl levulinate from furfuryl alcohol as well as a preparation method and application of the catalyst. The preparation method of the catalyst comprises the following steps: (1) adding precursor salt of copper and aluminum oxide into deionized water, stirring at normal temperature, then adding 2-methylimidazole, stirring at normal temperature, and finally heating and stirring to obtain a mixed solution; (2) adding sodium carbonate into the mixed solution, heating and stirring, then filtering, washing filter residues with ionized water until the filter residues are neutral, and then drying to obtain a precursor; and (3) roasting the precursor to obtain the catalyst for preparing alkyl levulinate from furfuryl alcohol. The method for preparing the alkyl levulinate by catalyzing the hydrogenolysis of the furfuryl alcohol is mild in reaction condition, the alkyl levulinate is prepared by the hydrogenolysis of the furfuryl alcohol under the mild condition, and the yield of the alkyl levulinate is relatively high.

The invention discloses a method for producing epoxypropane with low energy consumption by a cumene method. Comprising the following steps: S1, carrying out a reaction on cumene and oxygen-containing gas in a gas-liquid bubbling bed reactor to obtain an oxidation solution with the concentration of cumene hydroperoxide being 30-70%, and removing impurities to obtain dried cumene hydroperoxide, S2, carrying out a reaction on the dried cumene hydroperoxide and propylene in a tubular fixed bed reactor to obtain an epoxide material, recovering excessive propylene from the epoxide material, and recovering the propylene from the epoxide material to obtain the cumene hydroperoxide. S3, carrying out hydrogenolysis reaction on the crude alpha, alpha-dimethyl benzyl alcohol and hydrogen, so as to convert the crude alpha, alpha-dimethyl benzyl alcohol into crude cumene; s4, heavy component removal, light component removal and alkali washing are conducted on the crude cumene, impurities in the crude cumene are removed, and then the crude cumene is returned to the step S1. According to the method, the oxidation depth of the cumene in the oxidation unit is increased, the circulation amount of the cumene is greatly reduced, the energy consumption of the device is greatly reduced, and the economical efficiency of the device is improved.

The invention discloses a nitrogen-fluorine co-doped titanium dioxide loaded palladium-zirconium bimetallic catalyst as well as preparation and application of the nitrogen-fluorine co-doped titanium dioxide loaded palladium-zirconium bimetallic catalyst. The preparation method of the catalyst comprises the following steps: (1) preparing a fluorine-nitrogen co-doped titanium dioxide carrier; (2) preparing a precursor solution of palladium and zirconium; (3) mixing the fluorine-nitrogen co-doped titanium dioxide carrier with deionized water, stirring to form uniform slurry, sequentially adding the precursor solution of palladium and zirconium, adding a dispersing agent, stirring stably, heating and stirring, adjusting the pH value to be greater than 10.0, and continuously stirring for 1-2 hours; and carrying out suction filtration, washing and vacuum drying on the suspension, and reducing in an H2 atmosphere to obtain the catalyst. The invention provides the application of the nitrogen-fluorine co-doped titanium dioxide loaded palladium-zirconium bimetallic catalyst in synthesis of TAIW through HBIW continuous hydrogenolysis debenzylation reaction, the nitrogen-fluorine co-doped titanium dioxide loaded palladium-zirconium bimetallic catalyst has high reaction activity, yield and stability, meanwhile, the usage amount of precious metal palladium is reduced, and the production cost can be effectively reduced.

The invention discloses a method for preparing guaiacol monomer products by catalyzing selective hydrogenolysis of lignin through aluminum oxide loaded nickel and nickel-tin alloy. The catalyst simultaneously containing metal nickel and nickel-tin alloy active phases is prepared by adopting a urea precipitation method, organic soluble lignin is taken as a raw material, a mixture of alcohol substances and water is taken as a solvent, and the aluminum oxide loaded metal nickel and nickel-tin alloy catalyst prepared by adopting the urea precipitation method is added; and replacing air in the reaction kettle with inert gas, pressurizing to 1.0-3.0 MPa, and stirring at 210-270 DEG C for 1-6 hours to convert the organic soluble lignin into a compound mainly comprising guaiacol monomer products with high selectivity. The catalyst is simple in preparation process and low in cost, the lignin depolymerization reaction has the advantages of mild conditions, safe operation process and the like, and the obtained guaiacol product can be used for preparing chemicals such as food additives or medical intermediates.

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 present invention relates to a platinum / tungsten trioxide / silicoaluminate composite, a preparation method thereof and an application thereof. In the present invention, a platinum colloid and a tungsten trioxide colloid are respectively prepared, and then the platinum colloid and the tungsten trioxide colloid are mixed and silicon aluminate is added thereto to obtain the platinum / tungsten trioxide / silicoaluminate composite. The preparation method is very simple, easy to repeat and control; in the platinum / tungsten trioxide / silicoaluminate composite prepared by the present invention, there is a good combination between platinum nanoparticles and tungsten trioxide nanoparticles. When used as a catalyst in the selective hydrogenolysis reaction of polyols, it has a higher polyol conversion rate and selectivity, and good repeatability.

The invention belongs to the technical field of hydrodesulfurization, and particularly relates to a butyl phosphonic acid modified magnesium-based hydrodesulfurization material and a preparation method thereof. The magnesium-based hydrodesulfurization material is prepared from the following raw materials: magnesium, carbon black and butyl phosphonic acid, and the preparation method comprises the following steps: adding the magnesium into the carbon black for ball milling; carrying out hydrotreating on a solid product obtained by ball milling; adding the hydrotreated solid product into butyl phosphonic acid for ball milling; and carrying out heat treatment on a solid product obtained by ball milling in the previous step to prepare the butyl phosphonic acid modified magnesium-based hydrodesulfurization material. Magnesium hydride in the magnesium-based hydrodesulfurization material is used as a high-activity hydrogen source for hydrodesulfurization of dibenzothiophene in an anthracene oil liquid phase, and high temperature and high pressure are not needed in the hydrodesulfurization process; the surface of magnesium hydride is modified by butyl phosphonic acid, so that dibenzothiophene molecules stand and are adsorbed on the surface of magnesium hydride, a direct hydrogenolysis desulfurization reaction is carried out, and a benzene ring is not subjected to hydrogenation saturation, so that the selectivity of the hydrodesulfurization reaction 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%.

The present invention discloses a method for preparing a Pd(OH)2 / ultra-thin spherical two-dimensional SiO2 catalyst, which belongs to the technical field of catalyst preparation. The method comprises the following steps: preparing a template solution, adding a silicon precursor and a morphology control agent dropwise thereto, stirring to obtain a composite precursor solution, dropping the composite precursor solution into an alkaline solution, reacting, centrifuging, washing and calcining to obtain an ultra-thin spherical SiO2 carrier, dispersing the carrier in deionized water and ultrasonically stirring to obtain a suspension, adding an acid solution of a palladium precursor to the suspension, stirring to obtain a target catalyst. The present invention also discloses a Pd(OH)2 / ultra-thin spherical two-dimensional SiO2 catalyst and its application. The method is simple in process, the carrier in the prepared catalyst has a large specific surface area, can stably load Pd(OH)2, exhibits high catalytic activity and low Pd loss rate in the HBIW hydrogenolysis benzyl reaction, and has good application prospects.