334results about How to "Efficient Catalysis" patented technology

The present invention is directed to novel organometallic complexes as catalysts for the reaction of compounds with isocyanate and hydroxyl functional groups to form urethane and / or polyurethane and the process employing such catalysts. More particularly, the present invention is directed to novel complexes of zinc(II) with substituted amidines. These novel catalysts are useful for the production of urethanes and polyurethanes which are important in many industrial applications.

This invention provides novel fuel cell catalysts comprising new series of catalytically active thin-film metal alloys with low platinum concentration supported on nanostructured materials (nanoparticles). In certain embodiments, an integrated gas-diffusion / electrode / catalyst layer can be prepared by processing catalyst thin films and nanoparticales into gas-diffusion media such as Toray or SGL carbon fiber papers. The catalysts can be placed in contact with an electrolyte membrane for PEM fuel cell applications.

The present invention is directed to novel organometallic complexes as catalysts for the reaction of compounds with isocyanate and hydroxyl functional groups to form urethane and / or polyurethane and the process employing such catalysts. More particularly, the present invention is directed to novel complexes of zinc(II) with substituted amidines. These novel catalysts are useful for the production of urethanes and polyurethanes which are important in many industrial applications.

This invention relates to a novel process which comprises feeding a mixture formed from diphenylethane and bromine to a stirrable reaction mass comprised of bromine and a bromination catalyst to yield a decabromodiphenylethane wet cake which can be most economicaly treated to provide a high quality decabromodiphenylethane product.

There is a tin-free curable composition having (A) one or more organic polymers having a reactive-silicon-containing group, wherein at least one polymer has a main chain skeleton selected from the group consisting of polyoxyalkylene polymers, saturated hydrocarbon polymers, and (meth)acrylic acid ester polymers; (B) from 0.001 to 20 parts by weight for 100 parts by weight of the organic polymer(s) (A) of a silanol condensation catalyst consisting of one or more metal amidine complexes and one or more amine carboxylate salts, (C) a crosslinker or chain extender chosen from an alkoxysilane, an alkoxysiloxane, an oximosilane, an oximosiloxane, an epoxysilane, an epoxysiloxane, an aminosilane, a carboxysilane, a carboxysiloxane, an alkylamidosilane, an alkylamidosiloxane, an arylamidosilane, an arylamidosiloxane, an alkoxyaminosilane, an alkaryaminosiloxane, an alkoxycarbamatosilane, an alkoxycarbamatosiloxane, and combinations of two or more thereof; and (D) at least one adhesion promoter chosen from a silane or siloxane other than the compounds listed under (C). There is also a cured polymer formed from the tin-free curable composition.

The invention relates to a supported bimetallic catalyst for the catalytic oxidation of VOCs and a preparation method and application thereof. The supported bimetallic catalyst takes titanium dioxide as a carrier, a first active component as ruthenium dioxide, a second active component as any one of magnesium oxide, cobalt oxide, copper oxide or cerium oxide and is capable of accelerating the catalytic oxidation efficiency on the VOCs through the concerted catalysis effect between the two active components. Compared with a commercial supported palladium-platinum catalyst, the supported bimetallic catalyst disclosed by the invention is lower in cost and higher in universality, achieves the complete oxidation temperature of multiple VOCs between 170 DEG C and 250 DEG C, is superior to the commercial supported palladium-platinum catalyst in integral property and very high in final reaction product CO2 selectivity and has preferable application prospect.

This invention provides novel fuel cell catalysts comprising new series of catalytically active thin-film metal alloys with low platinum concentration supported on nanostructured materials (nanoparticles). In certain embodiments, an integrated gas-diffusion / electrode / catalyst layer can be prepared by processing catalyst thin films and nanoparticales into gas-diffusion media such as Toray or SGL carbon fiber papers. The catalysts can be placed in contact with an electrolyte membrane for PEM fuel cell applications.

The present invention is directed to novel organometallic complexes as catalysts for the reaction of compounds with isocyanate and hydroxyl functional groups to form urethane and / or polyurethane and the process employing such catalysts. More particularly, the present invention is directed to novel complexes of zinc(II) with substituted amidines. These novel catalysts are useful for the production of urethanes and polyurethanes which are important in many industrial applications.

The device and method of this invention provides a means to increase anhydrosugars yield during pyrolysis of biomass. This increase is achieved by injection of a liquid or gas into the vapor stream of any pyrolysis reactor prior to the reactor condensers. A second novel feature of our technology is the utilization of sonication, microwave excitation or shear mixing of the biomass to increase the acid catalyst rate for demineralization or removal of hemicellulose prior to pyrolysis. The increased reactivity of these treatments reduces reaction time as well as the required amount of catalyst to less than half of that otherwise required. A fractional condensation system employed by our pyrolysis reactor is also a novel element of our technology. This system condenses bio-oil pyrolysis vapors to various desired fractions by differential temperature manipulation of individual condensers comprising a condenser chain.

The invention relates to a supported hydrosilylation catalyst and a preparation method thereof, and aims to provide a heterogeneous catalyst suitable for hydrosilylation and a preparation method thereof. When the catalyst is used, the reaction conditions are mild; and the catalyst is safe and effective and conveniently separated from the product, and can be recycled. The catalyst provided by the invention has the structural formula shown in the specification. The preparation method provided by the invention comprises the following steps: 1) modifying the carrier surface with a coupling agent;2) modifying the carrier surface with a functional group compound; and 3) preparing the catalyst through coordination complexing with a platinum compound.

The invention discloses a high-performance catalyst for preparing olefin through dehydrogenation of light alkane and a preparation method thereof. The preparation method comprises the following steps of: steeping active components by adopting a steeping method of forming a stable complexing solution under the existence of an inorganic and / or organic acid, drying, burning, carrying out hydrogen reduction and activating to obtain the high-performance catalyst by taking high-temperature composite oxide containing one or mixture of multiple of aluminium oxide, magnesium oxide, zirconium oxide and zinc oxide as a carrier, one or multiple of metals such as ruthenium, rhodium, platinum and iridium as a main active component, one or multiple of metals such as germanium, tin or lead as a first additive, and one or multiple of alkali metals such as lithium, sodium, potassium, rubidium, cesium or francium as a second additive. Test results for light alkane dehydrogenation show that the catalyst has high catalytic activity, selectivity and stability.

The invention relates to a production method for simply and quickly fermenting black garlic. The method is short in production cycle, controllable in condition, simple, and easy to promote. By using the method, a situation that the quality of products in each batch is same is ensured by using closed fermentation and accurate temperature-control devices. Meanwhile, according to the invention, the existing fermentation process is scientific in design, and a five-step fermentation method for closed fermentation is provided, thereby ensuring a process that allinase can efficiently catalyze allicin. The black garlic produced by using the method disclosed by the invention is soft in taste and good in mouthfeel, and the nourishment compositions are significantly improved. According to the method, no additive is added, therefore, the cost is reduced, and the method is suitable for multi-batch co-fermentation.

The invention relates to an activated carbon-loaded nano-zinc oxide ozonation catalyst and preparation and use thereof. The catalyst is prepared by loading nano-zinc oxide on the surface of modified activated carbon. The modified activated carbon carrier is prepared by cleaning activated carbon with a sodium hydroxide solution, then dipping with dilute nitric acid, cleaning with deionized water and then drying. According to the catalyst disclosed by the invention, active components are prepared by adopting a coprecipitation method and taking zinc nitrate as a precursor; zinc hydroxide precipitate is generated by using a saturated zinc nitrate solution and a saturated urine solution and is attached to the surface of the modified activated carbon, and then the activated carbon the surface of which is attached with the zinc hydroxide is dried and roasted to prepare the oxidization catalyst. That is, the adsorption property of the activated carbon is reserved, and nano-zinc oxide microparticles having ozone catalysis activity are loaded in the activated carbon. Under the synergistic effect of adsorption and activation, organic pollutants in water can be adsorbed at high efficiency, and meanwhile, ozone molecules can be catalyzed and activated to produce free radicals having high oxidizability, thereby obtaining a better catalytic ozonation effect.

The present invention relates to a production method capable of producing an optically active α-hydroxyphosphonic acid and its derivatives with sufficiently high enantioselectivity not only for aromatic aldehydes but also for aliphatic aldehydes, and more specifically to a method of producing an optically active α-hydroxyphosphonic acid and its derivatives, characterized in that an optically active aluminum(salalen) complex represented by any one of the following formulae (I), (I′), (II) and (II′):[wherein R1s are each alkyl group or aryl group independently; R2s are each alkyl group or aryl group independently; R3s are each alkyl group or aryl group independently, and two R3s may bond with each other to form a ring; R4s are each hydrogen atom, halogen atom, alkyl group, alkoxy group, nitro group, or cyano group independently; R5 is alkyl group; and X1 is halogen atom, alkyl group, alkoxy group, acetoxy group or toluenesulfonyloxy group] is used as a catalyst to asymmetrically hydrophosphonylate an aldehyde with phosphonic acid or its derivatives.

The invention relates to a method for preparing immobilized enzyme by taking a bacterial cellulose bead / membrane as a vector. The method comprises the following steps of: fermenting to prepare the bacterial cellulose bead or the bacterial cellulose membrane; treating the bacterial cellulose bead or the bacterial cellulose membrane in a water bath with 0.1 percent NaOH at the temperature of between 80 and 90 DEG C for 30 to 120 minutes; rinsing the mixture with deionized water; collecting the solution; neutralizing residual alkali liquor with 0.1 percent acetic acid; standing the solution; rinsing the mixture with deionized water; taking the bead or the membrane out; absorbing surface moisture; freezing the bead or the membrane; performing freeze drying on the bead or the membrane for layer use; and preparing the immobilized enzyme by a physical adsorption method or an adsorption crosslinking method. The bacterial cellulose bead / membrane can efficiently adsorb biological enzyme, maintains the activity of the enzyme to the greatest extent and is safe and environmental friendly; and the method is simple, is easy to operate and has high controllability.

The invention provides a cryptomelane-based composite metal element catalyst, and a preparation method and application thereof. The cryptomelane-based composite metal element catalyst is prepared from acryptomelane-containing manganese oxide molecular sieve and a doping metal element, wherein the doping metal element enters a cryptomelane type manganese oxidemolecular sieve framework; the mole ratio of the manganese element in the cryptomelane type manganese oxidemolecular sieve to the doping metal element is (100 to 1) to (10 to 1); the cryptomelane type manganese oxide molecular sieve is obtained through the reaction of septivalence manganese and bivalent manganese; the mole ratio of the septivalence manganese to the bivalent manganese is (2 to 1) to (0.5 to 1). The cryptomelane-based composite metal element catalyst provided by the invention has high catalytic activity, and the usage of precious metal is not needed or reduced, so that the cost of the catalyst is greatly reduced; the catalyst has no need to be activated by utilizing hydrogen reduction, is simple in usage conditions, and can be widely applied in purification treatment of benzene-containing waste gas discharged by fixed sources such as a smelting plant, an oil refinery plant and a chemical plant.

The invention relates to a method of synthesizing trehalose by virtue of whole cell catalysis. The method comprises the following steps that: recombinant Escherichia coli cells used for massively producing trehalose synthase are cultivated in a fermenting manner, permeable treatment is carried out on the recombinant cells by using an ecological biosurfactant, and the trehalose is synthesized by the treated cells in a phosphate buffering system by using maltose as a substrate. According to the method disclosed by the invention, the Escherichia coli after the permeable treatment is used for synthesizing the trehalose by using the 25-3 percent of maltose as the substrate, the conversion rate of the substrate can reach 55-60 percent after reaction for 16-20 hours at the temperature of 20-25 DEG C; in addition, compositions of a reaction solution are very simple, thus greatly simplifying an extraction and purification technology of the permeable treatment. By utilizing the method provided by the invention, the trehalose with high quality can be efficiently produced in a large scale with low cost.

The invention discloses a novel activated carbon fiber adsorbent a preparation method and the application thereof. The activated carbon fiber adsorbent is characterized by carrying MoS2 on the surface of activated carbon fiber. The preparation method comprises the following steps: the activated carbon fiber is used as a carrier, ammonium molybdate is used as a precursor, and deionized water is used as a solvent to be prepared into steeping liquor, wherein the mass ratio of the activated carbon fiber to the ammonium molybdate is 1 : 0.25 to 0.3; the ammonium molybdate is carried in the activated carbon fiber by a wet immersion method, and then, the activated carbon fiber immersed with the ammonium molybdate is heated to 450 to 500 DEG C in inert atmosphere to be oxidized and decomposed to obtain MoO3-activated carbon fiber; and then, the MoO3-activated carbon fiber is heated to 800 to 825 DEG C in Ar / H2S to be sulfurized, and finally, the activated carbon fiber with the surface carried with MoS2 is prepared, i.e. the activated carbon fiber adsorbent is prepared. When the activated carbon fiber adsorbent is used for removing mercury in fume, the effect is good, and the activated carbon fiber adsorbent also has the advantages of simple preparation and easy process control.

The invention discloses a preparation method of a sulfoacid-type cation exchange resin catalyst. The preparation method of the sulfoacid-type cation exchange resin catalyst comprises the following steps: swelling for 10 minites-3 hours at 20-80 DEG C by taking a macropore crosslinked polystyrene-divinylbenzene copolymer as a sulfonation carrier and taking dichloroethane as a solvent, reacting for 1.0-6.0 hours at 70-95 DEG C by taking methanesulfonic acid as a sulfonation reagent, warming up to 100-150 DEG C, and reacting for 0.5-3.0 hours; and then removing dichloroethane, washing, and drying to obtain a target product. The reaction time is short; the preparation process is simple; the exchange capacity of the obtained high-activity sulfoacid-type cation exchange resin catalyst is even greater than 5.5mg / g; the sulfoacid-type cation exchange resin catalyst can catalyze esterification reaction efficiently, can efficiently convert free fatty acid, is high in thermal stability, and is not affected by water generated in the esterification.

The invention belongs to the field of environmental pollution remediation and inorganic materials and particularly relates to a sulfur modified porous iron oxide catalyst, a preparation method therefor and application of the sulfur modified porous iron oxide catalyst. A main ingredient of the porous iron oxide catalyst is iron oxide, and a sulfide of iron coexists. The preparation method comprises the steps: dissolving oxalic acid in water so as to prepare an oxalic acid solution, carrying out heating in water bath, and carrying out stirring while carrying out heating until the oxalic acid is completely dissolved; and adding a sulfur compound solution into the oxalic acid solution, carrying out uniform mixing, then, dropwise adding a ferrous salt solution into the mixture, continuing to carry out stirring until the reaction is thorough, then, carrying out ice bath immediately so as to obtain a yellow suspension, carrying out filtrating, then, carrying out drying treatment so as to obtain a yellow sulfur-modified ferrous oxalate precursor, and then, carrying out calcination, thereby obtaining the sulfur modified porous iron oxide catalyst. The sulfur modified porous iron oxide catalyst can be used for effectively activating hydrogen peroxide and persulfate in sewage water with the pH value of 3-10 and efficiently removing toxic or refractory organic pollutants from the water.

The invention relates to a preparation method of methyl phenyl silicone oil with high refractive index, and belongs to the technical field of organosilicon synthesis. The method is as below: using dimethyl dichlorosilane, diphenyl dichlorosilane and dichloromethyl phenylsilane as polymerization monomers; adding the monomers into a solvent while stirring at 30 DEG C; uniformly stirring; dropwise adding a proper amount of a hydrolysate; continuing to react until the end of hydrolysis; standing for layering; separating out a lower layer of acid water; washing an upper layer organic phase to a neutral state to obtain a siloxane prepolymer; adding a proper amount of an end-capping reagent and a condensation catalyst into the siloxane prepolymer to carry out a condensation reaction; after the reaction, washing out the catalyst to a neutral state; and steaming out the solvent of xylene and low-boiling-point substances under reduced pressure to obtain the silicone oil. The methyl phenyl silicone oil prepared by the invention is a clarified transparent oily liquid with high refractive index, good product uniformity, high purity and good high temperature resistance; and the preparation technology is simple and easy for industrialization.

The invention discloses a preparation method, a product and application of iron-loaded biochar, and belongs to the technical field of material preparation. The preparation method comprises the following steps: drying, crushing and sieving biomass; putting the sieved biomass, a reducing agent and a soluble ferric salt into a container, adding water for mixing, then heating for reaction, and coolingand drying to obtain a material A after the reaction is finished; and heating and pyrolyzing the obtained material A to obtain the iron-loaded biochar. Iron and oxides thereof are formed on the surface of the biochar prepared by the method, so that the biochar has good magnetism and is beneficial to recovery and reutilization; when the catalyst is used for catalyzing persulfate to degrade organicwastewater, an efficient catalytic effect can be achieved, efficient removal of the organic wastewater is achieved, and a good using effect is achieved. According to the method for preparing the iron-loaded biochar, on the premise that the efficient catalytic performance of the biochar is guaranteed, the pyrolysis procedure can be rapidly completed.

The invention relates to a catalyst M-BTC which is synthesized by using M<2+> (one or more of Cu, Co, Ni, and Zn) as a central ion and trimesic acid (BTC) as a ligand according to a hydrothermal method and has an efficient catalytic effect on the cycloaddition reaction of carbon dioxide and epoxide. A preparation method and an evaluation method of the catalyst are as follows respectively: by a hydrothermal synthesis method, the M-BTC catalyst is synthesized through the coordination of the M<2+> and the BTC at a certain temperature and within a certain period of time; the catalyst has good performance in catalyzing the cycloaddition reaction of the carbon dioxide and the epoxide under the conditions that the temperature is 80-140 DEG C, the pressure is 5-15 bars, the time is 2-14 hours and the catalyst amount is 20-80mg.

The present invention discloses a kind of supported silicon hydrogenation catalyst and its synthesis. The supported silicon hydrogenation catalyst is prepared with inorganic matter as carrier, and through bonding silicon-ethylene bond on the surface of the carrier with coupling agent and subsequent complexing with chloroplatinic acid hexahydrate as the complexing agent. The catalyst is supported heterogeneous catalyst and has the features of high catalytic efficiency, capacity of being recovered, capacity of being reused, etc. It may be used in catalyzing silicon hydrogenating reaction of silane and siloxane widely.

Novel silicoaluminophosphate molecular sieve compositions comprising SAPO-11 and SAPO-41 with at least about 5 wt % of in situ-produced amorphous portion. Such compositions can be uncalcined or calcined and novel processes for their preparation are described. These compositions, when loaded or impregnated with a catalytically active species such as a Group VIII noble metal are novel, and are excellent hydroisomerization catalysts.

In one embodiment, a particulate filter includes a housing and a substrate disposed within the housing, the substrate comprising a catalyst composition comprising a single crystalline phase multiple metal oxide comprising platinum, wherein the substrate is designed such that gas flowing through the substrate, passes through a walls in the substrate prior to exiting the substrate.

The invention discloses a method for preparing a desulfurizing agent by carrying out thermal activation on red mud and active carbon and belongs to the field of coal desulfurization. The method comprises the specific steps: step a: sieving the red mud and the active carbon with a 300-mesh sieve respectively; drying at 105 DEG C until the weight is constant; step b: mixing the red mud and the active carbon according to the mass ratio ranging from (1 to 10) to (1 to 30); step c: activating a mixture in the step b in a muffle furnace at 700 DEG C to 1100 DEG C for 10min to 30min; after finishing the thermal activation, naturally cooling to room temperature under a sealed condition. The method disclosed by the invention has the advantages that the waste dreg red mud produced in a production process of aluminum oxide is prepared into the desulfurizing agent; a preparation process is simple and the activation time is short; the wet-method desulfurizing efficiency can reach 90 percent; the desulfurizing rate can be maintained to be 87 percent when the desulfurizing agent is continuously used under a low pH (Potential of Hydrogen) condition; the dosage of the desulfurizing agent is reduced so that the desulfurizing agent is economical and feasible.

The invention discloses a preparation method of a photocatalyst formaldehyde-removal blanket. Regenerated fine-denier long-stapled cotton and low-melting-point fiber with the temperature of 110 DEG C are selected as the raw materials, and meanwhile a photocatalyst dilute solution is prepared; regenerated fine-denier long-stapled cotton and low-melting-point fiber with the temperature of 110 DEG C are put into an opener to be opened and enter a carding machine to be carded after being mixed by a mixer, and a web is output; a high-pressure spraying gun is started to continuously and evenly spray the photocatalyst dilute solution to the upper surface of the web when the web is output by the carding machine to enter a web laying machine; when the web loaded with the photocatalyst dilute solution sequentially enters the web laying machine, a high-temperature oven, a low-temperature oven, an ironing roller and a cooling machine, an ultraviolet lamp is always turned on to irradiate nanometer titanium dioxide. A felt is rapidly and sufficiently loaded with the photocatalyst dilute solution through a spraying process, and the photocatalyst dilute solution has an efficient catalytic effect on removing formaldehyde through the ultraviolet lamp.

The invention belongs to the field of preparation of electrochemical functional nano materials and particularly relates to a method for preparing platinum supported nitrogen-doped three-dimensional graphene aerogel via a one-step hydrothermal method. The method comprises the following steps: modifying natural flake graphite powder to form oxidized graphene; and then, with oxidized graphene as a basis material and chloroplatinic acid and glycine as raw materials, preparing the platinum nano particle supported nitrogen-doped three-dimensional graphene aerogel via the one-step hydrothermal method through covalent bonding, and performing effective methanol catalytic reaction. With introduction of nitrogen atoms, the performance of the composite material is improved greatly. The platinum nano particle supported nitrogen-doped three-dimensional graphene aerogel composite material is excellent in catalytic performance and stability.