172 results about "Alcohol oxidation" patented technology

Binary and ternary electrocatalysts are provided for oxidizing alcohol in a fuel cell. The binary electrocatalyst includes 1) a substrate selected from the group consisting of NiWO4 or CoWO4 or a combination thereof, and 2) Group VIII noble metal catalyst supported on the substrate. The ternary electrocatalyst includes 1) a substrate as described above, and 2) a catalyst comprising Group VIII noble metal, and ruthenium oxide or molybdenum oxide or a combination thereof, said catalyst being supported on said substrate.

The invention relates to a preparation method of a benzaldehydes compound and a catalyst for the preparation method. The catalyst is composed of 0.01-90 wt% of metal grains and 10-99.99 wt% of mesoporous carbon carrier; the metal grains are selected from any two of Pd, Au, Ag, Pt, Ru, Rh, Ni, Cu, Fe, Co, Cr, W, Mo, Ti and Ta; the weight ratio of two types of the metal is 1: (0.01-100) and the average grain diameter of the metal grains is 1-100 nm; and the mesoporous carbon carrier is prepared from a heteroatom-doped mesoporous carbon material. The content of heteroatoms in the mesoporous carbon material is 0.01-80 wt%. The catalyst provided by the invention is stable for water, air and heat and has an excellent catalytic activity; particularly, the catalyst has a high selectivity when being used for catalyzing an alcohol oxidation reaction to prepare aldehyde or ketone. The preparation method of the benzaldehydes compound provided by the invention has the advantages of high conversion rate of raw materials and good selectivity of a target product.

The invention discloses a polymer photocatalyst and a method of water-phase photo-catalytic selective alcohol oxidation. According to the invention, an organic polymer carbon nitride catalyst is prepared, and is applied in a water-phase photo-catalytic selective alcohol oxidation system. Compared with common ultraviolet catalyst TiO2, visible light catalyst TiO2-xNx, metal sulfide, metal nitride, metal nitrogen oxides, and the like, when alcohol is oxidized in water phase with a green oxidant air/oxygen under mild conditions, the carbon nitride catalyst is more stable and shows higher efficiency. The preparation method of the carbon nitride catalyst is simple and feasible, and the catalyst comprises no metal element, such that the catalyst is cheap. With the catalyst, alcohol oxidation aldehyde synthesis or ketone synthesis processes are simple and feasible, such that industrialized large-batch productions of aldehyde and ketone compounds can be facilitated.

The invention provides a noble-metal/composite metal oxide/carbon nanometer tubular electro-catalyst and a preparation method and an application thereof, which belong to the technical field of the nanometer composite material, and are characterized in that: by utilizing the controllability of the hydrotalcite slab composition and the designability of the structure, Pt2+, Pd2+ and Ni2+, Co2+, Mg2+, Al3+ and Fe3+ ions are introduced into the slab so as to synthesize a layered dual-metal hydroxide precursor containing the noble metal elements. The Pt2+ and Pd2+ can be highly scattered and uniformly distributed on the molecule level, and the Pt2+ and Pd2+ can be used as a catalyst after being reduced to catalyze the growth of the carbon nanometer tube loading the noble metal particles and the composite electro-catalyst which is highly doped with the composite metal oxide. The method not only can effectively disperse the noble metal catalyst and controls the growth of the noble metal catalyst on the carbon nanometer tube and the composite metal oxide, but also strengthens the electro-catalyzing property of the noble metal which is loaded in the carbon nanometer tube and the composite metal oxide network matrix. The electro-catalyst is used as an electrode in the alcohol fuel battery, the specific activity of the electro-catalyst on the maximum peak value of the alcohol oxidation can reach 120 to 200 mA.mg-1. The preparation method realizes the integration, has simple operation, is free from the environmental pollution, and is applicable to the industrialization process.

The invention relates to a method for preparing mesoporous titanium silicon molecular sieves, which belongs to the technical field of preparation of mesoporous molecular sieve catalytic materials. The method comprises: adopting a cationic surfactant as a template agent, dispersing the cationic surfactant into deionized water, adding ammonia water to adjust the pH value of the solution, and adding silicon sources after the template agent is completely dissolved; making the materials undergo filtration, washing, drying and roasting, removing the organic template agent, and obtaining silicon dioxide mesoporous materials; and dispersing the obtained silicon dioxide mesoporous materials into ethanol, slowly adding titanium sources, loading titanium ions after hydrolysis of the titanium sources on the silicon dioxide mesoporous molecular sieves to form an active center, and obtaining titanium-loaded mesoporous molecular sieves. The reaction is easy to control, and the product has good repeatability and is suitable for mass production. By adoption of the prepared titanium silicon molecular sieves as a catalyst and hydrogen peroxide as an oxygen source to catalyze olefin epoxidation and alcohol oxidation, the reaction conditions are mild and the reaction has good selectivity and conversion rate.

The invention relates to a preparation method for aldehyde or alkone, in particular to a method for preparing aldehyde or alkone by oxygen catalysis and alcohol oxidation under the mild condition. Themethod comprises the following steps: according to the 5 mmol of reaction substrate, 1-8 percent of 2,2,6,6-tetramethylpiperidine-oxygen radical (TEMPO) or a derivative thereof, 4-20 percent of halogen-containing compound and 4-20 percent of nitric acid or nitrate are taken as the catalysts, 0.1-0.8 MPa oxygen or air is taken as the oxidant, then the reaction is carried out for 1-36 h at the temperature of 0-80 DEG C, a series of alcohols can be oxidized into aldehyde or alkone with high selectivity, a catalyst TEMPO and the derivative thereof can be circularly and alternately used, the turn-over number (TON) is up to 800 and the cost is greatly reduced. The invention has the advantages of safer reagent with lower price, wider applicability of the substrate, mild reaction conditions, convenient product separation, no pollution to the environment, easy industrialization, and the like.

The invention discloses a small-molecular alcohol oxidation electro-catalysis material and a preparation method and an application therefor. The small-molecular alcohol oxidation electro-catalysis material is a noble metal-metal hydroxide-carbon material ternary composite system and prepared by two steps; firstly, a carbon material and a metal salt solution are used as the raw materials to be subjected to a first time of reaction to grow metal hydroxide particles on the surface of the carbon material; then, the noble metal salt is taken as the raw material to be subjected to a second time of reaction to grow noble metal particles on the surface of the carbon material loaded with the metal hydroxide particles to obtain the noble metal-metal hydroxide-carbon material ternary composite system. When the small-molecular alcohol oxidation electro-catalysis material is used as the positive electrode catalyst of a direct alcohol fuel cell, efficient and stable alcohol electro-catalysis oxidation is realized, and an outstanding anti-CO-poisoning capability is achieved as well; and in addition, the small-molecular alcohol oxidation electro-catalysis material is lower in cost compared with the commercialized Pt-Ru alloy catalyst.

The invention belongs to the technical field of liquid phase oxidation, and discloses a cobalt-based catalyst for generating ester by alcohol oxidation, and a preparation method and application of the cobalt-based catalyst. The cobalt-based catalyst mainly comprises the following elements in percentage by weight: 27.0-50.0 percent of cobalt, 45.0-60.0 percent of carbon and 0.5-20.0 percent of nitrogen, wherein the particle diameter of cobalt nano particles in the cobalt-based catalyst is 5-40 nm. The cobalt-based catalyst is prepared in a pyrolysis mode in an inert atmosphere with ZIF-67 as a precursor. In the presence of the cobalt-based catalyst, alkaline aids are not added in the normal-temperature and normal-pressure atmospheric environment, and two alcohols react to prepare ester compounds. The cobalt-based catalyst is easy to synthesize in quantity, and is magnetic and recyclable. A method for catalyzing alcohol oxidation to generate ester in the presence of the cobalt-based catalyst has the advantages of low cost, simplicity in operation, environment friendliness, mild reaction condition, easiness in product separation and the like.

The invention relates to a kind of Mg-Al hydrotalcite loaded bimetallic nano-catalyst and its preparation method, and relates to application of the catalyst system in oxidation of alcohol into corresponding carbonyl compounds. The catalyst preparation method consists of: 1) preparing an Mg-Al hydrotalcite carrier through a urea decomposition method; 2) loading the precursors of metal Pd and Au on the Mg-Al hydrotalcite surface; and 3) then reducing Pd (II) and Au (III) through NaBH4, thus obtaining the bimetallic nanometer particle catalyst. The catalyst provided in the invention has the advantages of high catalytic activity, good stability, separability, and easy recovery, thus being applicable to alcohol oxidation reactions in aqueous phases.

An alcohol oxidation catalyst which is an organic oxidation catalyst to oxidize an alcohol, which contains azabicyclo [3.3.1]nonane N-oxyl represented by the following formula (1) having an N-oxyl group incorporated in a bicycle[3.3.1]nonane skeleton:

wherein X is H₂, O or NOH.

An organic oxidation catalyst for alcohols which is environmentally less harmful and with which efficient oxidation can be conducted. The oxidation catalyst for alcohols is a 1-alkyl-2-azadamantan-N-oxyl which has a nitroxyl group incorporated in the adamantane skeleton and was synthesized from as a base material a bicyclic compound obtained by the Grob-type ring-opening reaction of 1,3-adamantanediol. Due to the nitroxyl group on the adamantane skeleton, the α-position hydrogen is stabilized based on Bredt's rule and the stability of the oxoammonium group generated by the oxidation thereof is ensured. Compared to TEMPO, which is a conventional oxidation catalyst, this catalyst is reduced in steric hindrance and is usable in a wide range of reaction fields. Because of this, not only a primary alcohol but a secondary alcohol having a sterically complicated structure, which has been difficult to oxidize with TEMPO, can be oxidized at a high efficiency.

In some embodiments a ternary electrocatalyst is provided. The electrocatalyst can be used in an anode for oxidizing alcohol in a fuel cell. In some embodiments, the ternary electrocatalyst may include a noble metal particle having a surface decorated with clusters of SnO₂ and Rh. The noble metal particles may include platinum, palladium, ruthenium, iridium, gold, and combinations thereof. In some embodiments, the ternary electrocatalyst includes SnO₂ particles having a surface decorated with clusters of a noble metal and Rh. Some ternary electrocatalysts include noble metal particles with clusters of SnO₂ and Rh at their surfaces. In some embodiments the electrocatalyst particle cores are nanoparticles. Some embodiments of the invention provide a fuel cell including an anode incorporating the ternary electrocatalyst. In some aspects a method of using ternary electrocatalysts of Pt, Rh, and SnO₂ to oxidize an alcohol in a fuel cell is described.

The invention discloses an alcohol oxidation aldehyde ketone production applied novel catalyst and a preparation method thereof. According to the alcohol oxidation aldehyde ketone production applied novel catalyst, hydrotalcite-like compounds serve as the carrier, metal complexes which is one or two of V, Cr, Mn, Fe, Co, Ni, Cu, Au, Pd, and Pt serve as a catalytic oxidative activity center, and the content of carried metal elements is 0.03-5.00% of the total mass of the alcohol oxidation aldehyde ketone production applied novel catalyst. The invention also discloses the preparation method of the alcohol oxidation aldehyde ketone production applied novel catalyst. According to the alcohol oxidation aldehyde ketone production applied novel catalyst and the preparation method thereof, alcohol and oxidants serve as the raw materials, under the action of the prepared alcohol oxidation aldehyde ketone production applied novel catalyst, high ketone conversion rate and high aldehyde ketone absorbing rate can be achieved; meanwhile, no acid or alkali or organic additives exist in a reaction system, so that the alcohol oxidation aldehyde ketone production applied novel catalyst has the advantages of being high in yield rate, low in cost, free from environmental pollution, easy to separate, high in repeatability and the like. Meanwhile, the preparation method of the alcohol oxidation aldehyde ketone production applied novel catalyst has the advantages of being rich in raw material resource, free from environmental pollution and the like.

The invention discloses a load composite metal catalyst used for unsaturated alcohol oxidation and a preparation method thereof. The catalyst comprises: 0.001-0.3wt% of an alkali metal, 0.001-1wt% of an alkaline earth metal, 0.001-1wt% of scandium, 0.05-1wt% of cerium oxide and zirconia sol, 0.3-10wt% of copper, 1-30wt% of silver, and 60-95wt% of a carrier. The preparation method includes: using a precipitant to precipitate a silver salt solution, making the obtained silver precipitate into a silver-amine solution by an amine compound, employing an amine complexing solution of a soluble copper salt, a scandium salt, an alkali metal salt, an alkaline earth metal salt and additives to spray or dip the catalyst carrier, and then carrying out drying and roasting to obtain the loaded silver-copper composite catalyst. The catalyst provided by the invention has the characteristics of high reactivity, good stability and fewer three wastes, etc., thus being suitable for large-scale industrial production.

The invention relates to a preparation method of a multifunctional integrated porous solid material for catalytic oxidation, and belongs to the field of composite materials. The method comprises the following steps: preparing an organic ligand having a Bronsted alkaline function or capable of modifying Bronsted alkalinity, and carrying out a hydrothermal/co-precipitating reaction on the organic ligand and a transition metal source with catalytic activity to obtain the metal organic skeleton catalysis material integrating multiple catalysis functions. The material is applied in benzyl oxidation and alcohol oxidation systems with molecular oxygen as an oxygen source for the first time. The catalysis material prepared through the preparation method of the multifunctional integrated catalysis material effectively integrates a catalytic activity site with the Bronsted alkaline function, solves the problem of difficult activation of the green molecular oxygen source, and avoids the problems of difficult recovery and severe pollution of a homogeneous organic alkali needed by a catalysis system for realizing H removal of C-H bonds; and the multifunctional integrated catalysis material is used in the catalytic oxidation systems with the molecular oxygen as an oxygen source for the first time to realize establishment of high efficiency catalytic oxidation systems under alkali-free conditions.

The invention provides a greening method for preparing aldehydes and ketones through the alcohol oxidation of a copper catalyst. The greening method comprises the following steps: taking copper salt as the catalyst, a single-tooth or double-teeth N ligand as the ligand and an organic nitric oxide compound as a co-catalyst, and performing the alcohol aerobic oxidation reaction in water-phase or organic solvent under the existence of alkali and air to prepare an aldehyde and Ketone compound. A copper catalyst system, which is low in cost, easy to obtain, low in toxicity and high in activity, is adopted in the greening method, air is used as an economic, safe and green oxidant, and under the mild condition of the indoor temperature air, the aldehyde and ketone compound is prepared through effective alcohol oxidation. The reaction condition is simple and mild, the operation is easy, the reaction conversion rate is high, the product separation and purification are simple, and the recovery rate is high. The requirement on the reaction condition is relatively low, and the greening method has a good research and industrial application prospect.

An organic heteropoly acid hybrid catalyst is prepared with ionic liquid polymer and heteropoly acid. A preparation method for the organic heteropoly acid hybrid catalyst is divided into the following three steps: firstly, ionic liquid is amino-functionalized; the unsaturated functional ionic liquid and unsaturated aromatic compound are initiated by initiator to polymerize, so that the ionic liquid polymer is produced; and finally, after the anion exchange between the ionic liquid polymer and the heteropoly acid, the ionic liquid polymer-heteropoly acid hybrid catalyst is produced. The catalyst is applicable to a variety of alcohol oxidation reactions with H2O2 as oxidizer, solvent is not used in the process of alcohol oxidation, the environment cannot be polluted, and the catalyst also has the characteristics of high activity and selectivity and stable reusability, and is a environment-friendly novel organic heteropoly acid hybrid catalyst.

The present invention provides a mercaptan oxidation catalyst. Said catalyst uses multiporous material as carrier, and uses metallophthalocyanine with positive ion group and metallophthalocyanine with negative ion group as active component. Said invention also provides a method for mercaptan oxidation, said method is characterized by that in the presence of oxygen gas and alkaline solution medium the hydrocarbon flow is contacted with the invented catalyst. Besides, said invention also provides the preparation method of said catalyst and its concrete steps.

The invention discloses a M1+M2/C catalyst; M1 is any one of Pb, Bi, Sn and Ru, M2/C is any one of Pt/C, Pd/C and Au/C, the M2/C comprises, by mass, 0.5-85% of M2, and the M1+M2/C catalyst comprises, by mass, 1-30% of M1. The catalyst is prepared by impregnation method, and the preparation comprises three steps of (1) M2/C dispersion solution preparation, (2) M1 salt impregnation solution preparation and (3) M1+M2/C catalyst preparation. In the preparation process of the catalyst, a protective agent is not needed to add to control the particle size of the catalyst, the catalytic activity of an alkaline medium on small molecule alcohol oxidation is high, the stability is good, the preparation process is simple, the production can be enlarged, and the catalyst can be used as an electrochemical oxidation catalyst of small molecule alcohol in the alkaline medium, and is especially suitable for using as an oxidation catalyst of a small molecule alcohol fuel in an alkaline direct alcohol fuel cell.

An ethanol oxidation catalyst including a Pt/Ru alloy and tin(II) oxide or tin(IV) oxide, a method of manufacturing the same, an electrode for a fuel cell including the ethanol oxidation catalyst, and a fuel cell having excellent power generation efficiency using the electrode.

The invention relates to a multilevel core-shell structure magnetic nano gold catalyst and a preparation method thereof, belonging to the field of magnetic nano catalytic material. A core-shell structure composite which is formed by taking a lamellar double-hydroxyl composite metal oxide (M2+)(M3+)-LDHs as a shell and Fe3O4 magnetic nano particles as a core is taken as a carrier to load nano goldparticles, the shell (M2+)(M3+)-LDHs nano slice is vertically intersected and epitaxially grow and has a honeycomb appearance, the gold nano particles are carried and loaded on the surface of the (M2+)(M3+)-LDHs nano slice, and H2 is reduced, thus the multilevel core-shell structure magnetic nano gold catalyst Fe3O4@(M2+)(M3+)-LDHs@Au is obtained. The invention has the advantages that the multilevel core-shell structure magnetic nano gold catalyst has stronger superparamagnetism and also has excellent catalytic alcohol oxidation activity and selectivity, 1-phenethyl alcohol oxidation is takenas a probe reaction, the air is taken as an oxidant for reaction at the temperature of 80 DEG C, reaction is carried out for 3 hours, and yield of phenylacetaldehyde is 99%; meanwhile, the preparation method is simple, the catalyst is conveniently enriched and recycled by adding an external magnetic field after reaction is finished, and catalytic activity of the catalyst is not reduced after the catalyst is reused for five times.

The invention provides a method for preparing aldehyde and ketone by alcohol oxidation, which adopts 2,3-dichloro-5,6-dicyan p-benzoquinone as a catalyst, nitrite as a cocatalyst, and oxygen (or air) as an oxidant, and performs oxidation of alcohol in an organic solvent in the presence of an acid additive and under a liquid phase condition to generate aldehyde and ketone. The method is mild in reaction condition, simple in operation, and less in metal pollution, and is a green, environment-friendly new method for preparing aldehyde and ketone by alcohol oxidation with nonmetal catalysis.

The invention discloses a multi-hole hollow TiO2@C supported RuNi direct methanol fuel cell anode catalyst and a preparation method thereof, and the catalyst is composed of a TiO2@C carrier and a RuNi nano-alloy. The multi-hole hollow TiO2@C nano-carrier with high ratio surface and the RuNi nano-alloy can form the multi-element catalyst in a recombination manner. With the recombination of C and the deposition of the RuNi alloy on the surface of the carrier, the electrical conductivity of the TiO2 is improved; a catalytic oxidation of TiO2 on methyl alcohol is greatly improved through the synergistic effect on TiO2 of the recombination of C and the deposition of the RuNi alloy; meanwhile, intermediate products, such as CO, generated by methyl alcohol oxidation are adsorbed and transferred to the surface of the composite catalyst and are directly deeply oxidized to obtain a final product CO2; in addition, the TiO2@C nano-carrier is stable, and is less prone to oxidation. The price of RuNi is less than that of a precious metal Pt, and the dosage of RuNi in the catalyst is small, thus, the cost of the catalyst is greatly reduced, a CO toxicity resisting capacity of the catalyst is improved, the cost of the catalyst in a direct methanol fuel cell is greatly reduced, and the property of the direct methanol fuel cell is improved.

The invention relates to a method for preparing esters through primary alcohol oxidation. The method comprises the following steps: taking one or two of air and oxygen as an oxygen source, and oxidizing alcohols into esters under the catalytic action of hydrophobic carrier loaded metal nanoparticles. According to the method disclosed by the invention, the oxidation efficiency is high, and the product yield is high; the air or oxygen serves as an oxygen source, and the method is economic and environment-friendly; the product is separated from the catalyst, and the after-treatment is simple; and the catalyst is easily repeatedly used and has excellent application prospects.