The present application relates to a cerium-tin-based composite oxide catalyst for catalyzing purification of a nitrogen oxide, a preparation method and an application thereof. The catalyst has the following chemical composition: a cerium-tin oxide and an M oxide, wherein the M is selected from any one of or a combination of at least two of P, Ti, Zr, V, Mn, Fe, Cu, Al, Si, Ni, Hf, Nb, Ta, Cr, Mo, W, or Re. According to the present application, a cerium-tin-based composite oxide catalyst having the characteristics such as high catalytic activity, high hydrothermal stability, excellent N.sub.2 generation selectivity, a wide operation temperature window, and adaptation to high space velocity reaction conditions is prepared by means of a non-toxic and harmless raw material and a simple method, and the present application is applicable to a device for catalyzing purification of a mobile source nitrogen oxide represented by diesel vehicle exhaust gas and a fixed source nitrogen oxide represented by flue gas from a coal-fired power plant.

The present application relates to a cerium-tin-based composite oxide catalyst for catalyzing purification of a nitrogen oxide, a preparation method and an application thereof. The catalyst has the following chemical composition: a cerium-tin oxide and an M oxide, wherein the M is selected from any one of or a combination of at least two of P, Ti, Zr, V, Mn, Fe, Cu, Al, Si, Ni, Hf, Nb, Ta, Cr, Mo, W, or Re. According to the present application, a cerium-tin-based composite oxide catalyst having the characteristics such as high catalytic activity, high hydrothermal stability, excellent N.sub.2 generation selectivity, a wide operation temperature window, and adaptation to high space velocity reaction conditions is prepared by means of a non-toxic and harmless raw material and a simple method, and the present application is applicable to a device for catalyzing purification of a mobile source nitrogen oxide represented by diesel vehicle exhaust gas and a fixed source nitrogen oxide represented by flue gas from a coal-fired power plant.

[1] A catalyst for synthesizing 1,3-butadiene by contact with ethanol, which comprises tungsten oxide and magnesium oxide. [2] The catalyst, wherein a mass ratio of the magnesium oxide to the tungsten oxide (magnesium oxide/tungsten oxide) is 0.1 to 200. [3] The catalyst, wherein the mass ratio is at least 5. [4] The catalyst, wherein amounts of the tungsten oxide and the magnesium oxide relative to 100% by mass of the catalyst are as follows: the amount of the tungsten oxide: 0.1 to 90% by mass; and the amount of the magnesium oxide: 10 to 90% by mass.

[1] A catalyst for synthesizing 1,3-butadiene by contact with ethanol, which comprises tungsten oxide and magnesium oxide. [2] The catalyst, wherein a mass ratio of the magnesium oxide to the tungsten oxide (magnesium oxide/tungsten oxide) is 0.1 to 200. [3] The catalyst, wherein the mass ratio is at least 5. [4] The catalyst, wherein amounts of the tungsten oxide and the magnesium oxide relative to 100% by mass of the catalyst are as follows: the amount of the tungsten oxide: 0.1 to 90% by mass; and the amount of the magnesium oxide: 10 to 90% by mass.

There is provided a method for synthesizing an alkenoic acid, in particular acrylic acid comprising the step of oxidizing an alkenyl alcohol in the presence of a metal oxide catalyst to form the alkenoic acid. The invention further provides a step of deoxydehydrating a polyol, including glycerol to obtain said alkenyl alcohol including an allyl alcohol.

Multi-metallic bulk catalysts and methods for synthesizing the same are provided. The multi-metallic bulk catalysts contain nickel, molybdenum tungsten, niobium, and optionally, titanium and/or copper. The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.

Multi-metallic bulk catalysts and methods for synthesizing the same are provided. The multi-metallic bulk catalysts contain nickel, molybdenum tungsten, niobium, and optionally, titanium and/or copper. The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks.

This invention is directed to a method of oxygenating hydrocarbons with molecular oxygen, O.sub.2, as oxidant under electrochemical reducing conditions, using polyoxometalate compounds containing copper such as Q.sub.10[Cu.sub.4(H.sub.2O).sub.2(B-α-PW.sub.9O.sub.34).sub.2] or Q.sub.13{[Cu(H.sub.2O)].sub.3[(A-α-PW.sub.9O.sub.34).sub.2(NO.sub.3).sup.−]} or solvates thereof as catalysts, wherein Q are each independently selected from alkali metal cations, alkaline earth metal cations, transition metal cations, NH.sub.4.sup.+, H.sup.+ or any combination thereof.

This invention is directed to a method of oxygenating hydrocarbons with molecular oxygen, O.sub.2, as oxidant under electrochemical reducing conditions, using polyoxometalate compounds containing copper such as Q.sub.10[Cu.sub.4(H.sub.2O).sub.2(B-α-PW.sub.9O.sub.34).sub.2] or Q.sub.13{[Cu(H.sub.2O)].sub.3[(A-α-PW.sub.9O.sub.34).sub.2(NO.sub.3).sup.−]} or solvates thereof as catalysts, wherein Q are each independently selected from alkali metal cations, alkaline earth metal cations, transition metal cations, NH.sub.4.sup.+, H.sup.+ or any combination thereof.

The present invention relates to a process for preparing a cobalt-containing Fischer-Tropsch synthesis catalyst with good physical properties and high cobalt loading. In one aspect, the present invention provides a process for preparing a supported cobalt-containing Fischer-Tropsch synthesis catalyst, said process comprising the following steps of: (a) impregnating a support powder or granulate with a cobalt-containing compound; (b) calcining the impregnated support powder or granulate and extruding to form an extrudate; or extruding the impregnated support powder or granulate to form an extrudate and calcining the extrudate; and (c) impregnating the calcined product with a cobalt-containing compound; or forming a powder or granulate of the calcined product, impregnating with a cobalt-containing compound and extruding to form an extrudate.