785 results about "Bifunctional catalyst" patented technology

The present application is directed to mesoporous carbon materials comprising bi-functional catalysts. The mesoporous carbon materials find utility in any number of electrical devices, for example, in lithium-air batteries. Methods for making the disclosed carbon materials, and devices comprising the same, are also disclosed.

The present invention relates to one kind of high activity catalyst for catalyzing and activating CO2 to react with alkane epoxide to synthesize polycarbonate. The high activity catalyst is tetradentate Schiff base metal complex with double function, i. e., it has both electrophlic center originated from the metal ion in the complex and nucleophilic center originated from the quaternary ammonium salt or quaternary phosphonium salt connected to the benzene ring in the complex. The catalyst can catalyze the reaction of CO2 and alkane epoxide effectively to prepare polycarbonate.

The average propylene cycle yield of an oxygenate to propylene (OTP) process using a dual-function oxygenate conversion catalyst is substantially enhanced by the use of a combination of: 1) moving bed reactor technology in the catalytic OTP reaction step in lieu of the fixed bed technology of the prior art; 2) a separate heavy olefin interconversion step using moving bed technology and operating at an inlet temperature at least 15° C. higher than the maximum temperature utilized in the OTP reaction step; 3) C₂ olefin recycle to the OTP reaction step; and 4) a catalyst on-stream cycle time of 700 hours or less. These provisions hold the build-up of coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling maintenance of average propylene cycle yield for each cycle near or at essentially start-of-cycle levels.

The present invention relates to a novel synthetic route of a liquid chain hydrocarbon fuel totally independent of fossil energy based on a lignocellulose raw material to obtain a platform compound. The method includes three parts: 1) preparing oxygen-containing organic compounds with carbon chain length of 8-16 through the acid-catalyzed alkylation reaction by taking lignocelluloses-based carbonyl-containing platform compounds and furan platform compounds as raw materials on a novel solid catalyst; 2) effectively removing carbon-carbon double bonds and carbon-oxygen double bonds to prepare saturated oxygen-containing organic compounds by hydrogenation of the alkylated product; and 3) conducting hydrodeoxygenation for the hydrogenated alkylation product by using a metal-solid acid bifunctional catalyst to obtain the biomass aviation kerosene or high grade diesel fuel with the carbon chain length of 8-16 and having a high energy density and stability.

The invention discloses a dual-functional catalyst composition and an integrated process for production of olefin epoxides including propylene oxide by catalytic reaction of hydrogen peroxide from hydrogen and oxygen with olefin feeds such as propylene. The epoxides and hydrogen peroxide are preferably produced simultaneously in situ. The dual-functional catalyst comprises noble metal crystallites with dimensions on the nanometer scale (on the order of <1 nm to 10 nm), specially dispersed on titanium silicalite substrate particles. The dual functional catalyst catalyzes both the direct reaction of hydrogen and oxygen to generate hydrogen peroxide intermediate on the noble metal catalyst surface and the reaction of the hydrogen peroxide intermediate with the propylene feed to generate propylene oxide product. Combining both these functions in a single catalyst provides a very efficient integrated process operable below the flammability limits of hydrogen and highly selective for the production of hydrogen peroxide to produce olefin oxides such as propylene oxide without formation of undesired co-products.

The average propylene cycle selectivity of an oxygenate to propylene (OTP) process using a dual-function oxygenate conversion catalyst is substantially enhanced by the use of a combination of: 1) moving bed reactor technology in the hydrocarbon synthesis portion of the OTP flow scheme in lieu of the fixed bed technology of the prior art; 2) a hydrothermally stabilized and dual-functional catalyst system comprising a molecular sieve having dual-function capability dispersed in a phosphorus-modified alumina matrix containing labile phosphorus and/or aluminum anions; and 3) a catalyst on-stream cycle time of 400 hours or less. These provisions stabilize the catalyst against hydrothermal deactivation and hold the build-up of coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling maintenance of average propylene cycle yield near or at essentially start-of-cycle levels.

The invention discloses a gasoline deep desulphurization and olefin reduction method, comprising that the gasoline raw material and hydrogen are contacted with hydrogenation absorption desulphurization and olefin aromatization difunctional catalyst to remove sulfur in the gasoline and reduce the olefin content in the gasoline product. The method of the invention can produce gasoline product with the sulfur content lower than 50 micrograms per gram, and can further produce gasoline product with the sulfur content lower than 10 micrograms per gram while the olefin content is lower than 20v%, and meanwhile the antiknock quality index loss is low. The method of the invention can be applied to deep desulphurization and olefin reduction process of FCC gasoline, catalytic pyrolysis gasoline, coker gasoline, pyrolysis gasoline and pressure gasoline or the mixed gasoline raw material thereof.

The average cycle propylene selectivity of an oxygenate to propylene (OTP) process using one or more fixed or moving beds of a dual-function oxygenate conversion catalyst with recycle of one or more C₄⁺ olefin-rich fractions is substantially enhanced by the use of selective hydrotreating technology on these C₄⁺ olefin-rich recycle streams to substantially eliminate detrimental coke precursors such as dienes and acetylenic hydrocarbons. This hydrotreating step helps hold the build-up of detrimental coke deposits on the catalyst to a level which does not substantially degrade dual-function catalyst activity, oxygenate conversion and propylene selectivity, thereby enabling a substantial improvement in propylene average cycle yield. The propylene average cycle yield improvement enabled by the present invention over that achieved by the prior art using the same or a similar catalyst system but without the use of the hydrotreating step on the C₄⁺ olefin-rich recycle stream is of the order of about 1.5 to 5.5 wt-% or more.

The invention relates to a new method for preparing hydrocarbons in the scope of aviation kerosene from C8-C16 furyl oxygen-containing organic compounds as raw materials by hydrogenation deoxidation reaction, wherein the C8-C16 furyl oxygen-containing organic compounds are obtained by C-C coupling of lignocellulose based platform chemical compounds; low temperature direct hydrogenation deoxidation under the condition of no solvent of the furyl oxygen-containing organic compounds can be realized by use of a metal-solid acid dual-functional catalyst to obtain a series of low freezing point branched alkanes having the chain in the length range of the aviation kerosene in high yield. The catalyst is composed of two parts of an active metal A and an acid vector X. The catalyst related in the method ahs the characteristics of being in no need of a solvent, simple in operation process, mild in reaction conditions, good in aviation kerosene (or diesel) selectivity, and the like, and is an ideal hydrogenation deoxidation catalyst for preparing liquid fuels from the furyl oxygen-containing organic compounds by the hydrogenation deoxidation.

The invention relates to the field of catalysts for energy-producing devices such as fuel cells, metal-air cells, electrolysed water and the like, in particular to a dual-function non-noble-metal catalyst and a preparation method thereof. The structure of the dual-function catalyst with activity of realizing oxygen reduction and oxygen release simultaneously is that non-noble-metal nanoparticles are dispersedly coated with a two-dimensional nitrogen-doped porous carbon layer, and the active center of the catalyst is the non-noble-metal nanoparticles coated with nitrogen-carbon, non-noble-metal-nitrogen-carbon and the carbon layer. The non-noble-metal oxygen electrode catalyst has the advantages that raw materials are cheap, a preparation process is simple and template removal and other complicated operating steps are avoided, thereby being suitable for commercial production and capable of substantially reducing cost under the premise that catalytic performance is guaranteed.

The invention relates to a metal supported MCM-22 molecular sieve hollow sphere bifunctional catalyst preparation method and an application thereof, belonging to the molecular sieve catalysis technology. The method is characterized in that carbon black sphere particles are used as template, molecular sieve hollow spheres with multi-stage pore path structure is prepared by rotation hydrothermal crystallization and by using metal active components the prepared molecular sieve hollow spheres are loaded and modified. The prepared Mo/HMCM-22 molecular sieve hollow sphere bifunctional catalyst can be used in methane non-oxidative aromatization reaction system. The effect and the benefit of the invention is that the preparation method of the molecular sieve hollow spheres has simple operation and low cost, and the prepared hollow sphere catalyst has excellent catalytic performance in the methane non-oxidative aromatization reaction, high methane conversion rate and aromatics yield and very long catalyst life.

The present invention relates to a dual functional catalyst having both the catalytic reaction function and fractionation function and a catalytic distillation equipment for packing the catalyst therein. Said catalyst has a special shape and can be packed at random into the reaction section of said equipment. So, there exist adequate free spaces inside pellet and between pellets, enabling the vapor and liquid streams to pass through the catalyst beds directly and countercurrently, and contact with the dual functional catalyst directly. The reaction between the reactants and fractionation of products can be carried out simultaneously. Thus a high reaction efficiency is achieved. No special inner part is needed in the reaction section to pack the catalysts, so the structure of the equipment is simple and easy to operate, and the investment and cost of operation are low.

The invention belongs to the field of environmental protection and catalyst, disclosing a bifunctional catalyst and a preparation method and an application thereof. The catalyst is prepared in a manner that substance containing rare earth metal element cerium, substance containing alkali metal element potassium and substance containing transition metal elements are loaded on a carrier under the action of adhesive to be baked; wherein transition metal elements are 1-3 elements of Cu, Mn, Fe, V, Co. The catalyst has low cost and high catalytic activity, does not cause secondary pollution, is suitable for preparation of chlorine by oxidation of hydrogen chloride to realize the recycling of chlorine resource, and is also suitable for deep oxidation combustion of organic impurities such as cyclohexane, benzene, toluene and the like in industrial waste gas.

A single-cell-thickness nano porous cobalt oxide nanosheet array electrocatalytic material is characterized in that a metal-doped cobalt oxide primary nanosheet array is perpendicularly grown on a conductive substrate, a porous nanosheet is obtained from each primary nanosheet, and the nanosheets are of porous structure; the material is used as an electrocatalyst for oxygen evolution reaction; the material also has excellent hydrogen evolution performance and may function as a bifunctional catalyst for an alkaline full-decomposition water system. The invention has the advantages that the material can effectively reduce overpotential and peaking potential of oxygen evolution reaction, increase conversion rate of single cobalt atoms and operate stably and continuously in a strong alkali environment; the material has excellent oxygen evolution reaction performance and can be applied as an anode and cathode of a full-decomposition water system, effectively reducing trough voltage; the material is simple to prepare, convenient to operate, low in cost and environment-friendly, and new idea and strategy are provided for the guide design and performance optimization of the bifunctional catalyst for the full-decomposition water system.

A bi-functional oxidation catalyst and process for catalytic oxidation and removal of nitrogen oxides (NO_x) from combustion gases derived from combustion of carbonaceous fuels such as coal, oil, or natural gas. The bi-functional catalyst includes adsorption and oxidation function metal oxides provided in adjacent close intimate contact by utilizing a binding agent, such as carboxylic acid and calcining to provide a metal oxide complex having a crystalline form. Such nitrogen oxides (NO_x) contained in the combustion gases are initially catalytically oxidized to at least about 50 vol % NO₂ and some higher oxides by contact with the bi-functional catalyst at 170-550° F. temperature. The combustion gas containing the partially oxidized NO_x is then preferably further chemically oxidized by being mixed with a chemical oxidant such as ozone (O₃) in a molar ratio of the chemical oxidant₃ to NO_x in the range of 0.5:1-1.2:1 to produce higher oxides of nitrogen such as substantially N₂O₅. The further treated combustion gas containing the N₂O₅ is next scrubbed with a suitable scrubbing liquid such as water to effectively remove the nitrogen oxides (NO_x) and produce a clean treated flue gas stream containing less than about 15 ppm nitrogen oxides and suitable for environmentally safe discharge to the atmosphere.

The invention relates to a nickel cobalt oxide/carbon nanotube composite catalyst, a preparation and an application thereof. The bi-functional catalyst comprises carbon nanotube and nickel cobalt oxide NiCo2O4 spinel; according to the preparation, nickel acetate, cobalt nitrate and carbon nanotube are respectively weighed, and then dissolved in ammoniacal liquor and the obtained material is performed with ultrasonic dispersion, then is subjected to a hydrothermal reaction at temperature of 140-160 DEG C for 3-6 hours, the obtained product is cooled to room temperature, cleaned and dried, calcined and ground to obtain the bi-functional catalyst. The invention also provides an application of the bifunctional catalyst in preparation of an air electrode of a metal air battery. The bi-functional catalyst has efficient oxygen reduction performance and efficient oxygen evolution performance in air.

The invention relates to a method for preparing 1,3-propylene glycol by utilizing a glycerol one-step hydrogenolysis method, in particular to preparation of a loaded solid acid bifunctional catalyst and a method for preparing 1,3-propylene glycol by virtue of glycerol selective hydrogenolysis by utilizing the catalyst. The method provided by the invention comprises the step of introducing hydrogen and reacting for 6-48 hours under the conditions that glycerol is taken as raw material, solvent and catalyst exist, reaction temperature is 100-230 DEG C and reaction pressure is absolute pressure of 0.2-10.0MPa. In the bimetal modified loaded strong acid catalyst prepared by adopting the method provided by the invention, a second non-precious metal is doped into the catalyst, dispersion degree of previous metal is further improved, thus the catalyst has stronger acidity, larger specific area and good stability; in the catalyst containing trace previous metal, cheap non-previous metal is introduced; glycol conversion rate is improved under lower reaction pressure while selectivity of 1,3-propylene glycol is obviously improved; meanwhile, effective utilization rate of the previous metal is improved, and cost of the catalyst is reduced.

A catalytic oxidizing method for extracting high-viscosity crude oil features that the aqueous solution of the water-soluble or lipo-soluble refrectory catalyst with both catalytic oxidizing and cracking functions is proportionally filled in oil stratum, the steam used as heating medium and diluent is then filled, the air used as oxidant is finally filled, and the viscosity of crude oil is decreased by 20-100% after catalytic oxidizing and cracking reactions.

The invention discloses a nickel hydroxide/nickel disulfide/foam nickel composite and a preparation method thereof, and application thereof. The composite is expressed in the form of Ni(OH)2/Ni3S2/NFand can be used as an electrode. In the electrode structure, the nano-stem-like Ni3S2/NF is a conductive skeleton, and the Ni(OH)2 nanosheet is equivalent to a leaf and grows on the nano-stem-like Ni3S2/NF skeleton. The heterointerface of Ni(OH)2 and Ni3S2 having a defect structure is the active center. The Ni(OH)2/Ni3S2/NF electrode can be used as a bifunctional catalyst, has excellent cathodic catalytic hydrogen evolution and anodic catalytic oxygen evolution reaction performance, and has high current long-term total electrolysis hydrogen production and oxygen production stability. Comparedwith noble metal catalysts such as Pt and RuO2, the catalyst synthesis method is simple, rich in raw materials and low in cost.