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.

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 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 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 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 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, 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.

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 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.