60results about How to "Increase active site" patented technology

The invention relates to a chromic oxide catalyst for alkali liquor surface treatment as well as a preparation method and an application thereof. According to the catalyst, chromic oxide powder is prepared by a precipitation method for a direct roasting method, and the chromic oxide catalyst is prepared in an alkali liquor soaking way and applied to a normal-temperature normal-pressure catalytic oxidation reaction of NO, so that NO can be catalyzed and oxidized into NO2 under a normal pressure at a normal temperature, a very high conversion rate is obtained, and high activity and high stability can be kept for a long time. The catalyst provided by the invention has the advantages of easily acquired raw materials, simple process and very good application prospect.

The invention relates to an alkali liquor treated integral chrome oxide catalyst, a preparation method and an application. According to the catalyst, an active ingredient chrome is soaked to an inert carrier cordierite honeycomb ceramic with a soaking method, the specific surface area of the integral catalyst is increased with an alkali liquor treatment method after drying and roasting, the chemical state of the active ingredient is changed, the active site is increased, and NO catalytic oxidation reactivity and the long-time stability under normal pressure and temperature are improved. According to the catalyst, the preparation method and the application, the process is simple, raw materials are easy to obtain, and engineering application is realized.

The invention discloses a preparation method of a honeycomb denitration catalyst with an improved specific surface area, and the preparation method comprises the following steps: (1) mixing and beating activated carbon and a sugar solution; (2) dissolving a titanium-source precursor; (3) dissolving a tungsten-source precursor, and mixing the tungsten-source precursor with the materials in the steps (1) and (2); (4) adjusting pH value of the mixed material in the step (3) to 8-13, precipitating, filtering and washing to obtain a filter cake; (5) regulating the filter cake in the step (4) to paste, adding a vanadium-source precursor solution, mixing, drying, under the protection of an inert gas baking to form powder; and (6) mixing a molybdenum-source precursor solution with the powder in the step (5) into paste, stirring, adding a pore forming agent, secondarily stirring, standing, extruding into a honeycomb shape, drying, coating surface with nano tungsten oxide, baking in an inert gas to obtain the catalyst. The specific surface area of the can be increased, uneven deposition of heavy metals on the catalyst in the flue gas can be resisted.

The invention discloses a honeycomb denitration catalyst with increased specific surface area and a preparation method. The preparation method comprises steps as follows: (1) beating active alumina; (2) dissolving a titanium source precursor; (3) dissolving a tungsten source precursor and mixing the dissolved tungsten source precursor with the materials in the steps (1) and (2); (4) adjusting pH of the material evenly mixed in the step (3) to 8-13, and performing precipitation, filtering and washing to obtain a filter cake; (5) adding water to the filter cake obtained in the step (4), mixing the filter cake into a slurry state, adding a vanadium source precursor solution, and performing mixing, drying and roasting to form powder; (6) mixing a solution formed by a molybdenum source precursor with the powder in the step (5) into a slurry, stirring the mixture, adding a pore-forming agent, performing secondary stirring, allowing the mixture to stand, squeezing the mixture into a honeycomb shape, performing drying, and coating the surface with nano-tungsten oxide for roasting to obtain the denitration catalyst. The prepared denitration catalyst has the advantages that the specific surface area can be increased, and non-uniform deposition of heavy metals in flue gas on the surface of the catalyst is prevented.

An additive for directionally transforming the harmful elements (S and N) in coal is a mixture of Ca-contained compound, Fe and Na contained compound with modifying function, SiO2 and others. It can change the route of oxidizing the precursors of SOx and NOx to make it toward harmless direction. Its application method is mixing it with coal before gasifying.

The invention relates to a preparation method for a graphene-coated iron-loaded and nitrogen-loaded active site catalyst on a carbon nano tube (CNT); sources of raw materials used for the method are extensive; carbon source and nitrogen source materials are low in cost; the sample yield is high; the production cost of a fuel cell is helped to be reduced; the content of Fe and N in the prepared catalyst is controllable, and meanwhile, bigger specific surface area is kept so as to overcome the problem that metal nanometer particles are easy to aggregate in the past. The preparation method comprises the following steps: (1) supporting Fe and N to the surface of the carbon nano tube to obtain Fe-N-CNT; (2) synthetizing a composite material, formed by coating the surface of the Fe-N-CNT with graphene precursors, by a hydrothermal method; (3) calcining the composite material to obtain Fe-N-CNT&GN. Compared with a traditional fuel cell cathode Pt / C catalyst, the catalyst prepared by the method disclosed by the invention is low in cost, relatively higher in catalytic activity, high in stability, high in methanol tolerance, and has a good commercial application prospect.

The invention provides a low-carbon alkane dehydrogenation catalyst. The catalyst is prepared from a platinum component and an alkali metal component, wherein an aluminum oxide based carrier containing an Sn-M-O solid solution is adopted; based on platinum oxide and based on alkali metal oxide, the catalyst comprises the following components in parts by weight: 0.1 to 2 parts of the platinum oxide, 0.1 to 5 parts of the alkali metal oxide, 90 to 99 parts of aluminum oxide and 0.1 to 8 parts of the Sn-M-O solid solution; M is selected from one or more metal elements in fourth, fifth, sixth andseventh periods of a periodic table of elements. According to the low-carbon alkane dehydrogenation catalyst provided by the invention, Sn and M elements in the prepared solid solution have a synergistic effect, so that the acidity of the catalyst is easy to reduce, the catalyst is rapidly dispersed from an intermediate product, and the selectivity of the catalyst is improved; meanwhile, uniform dispersion of Pt is promoted, active sites are increased, and the conversion rate is improved.