摘要:
The invention relates to a method for producing 1,2-propandiol, wherein a flow containing glycerine, in particular a flow produced on an industrial scale during the production of biodiesel, is subjected to low-pressure hydrogenation.
摘要:
Use of a solid Cu-Al-O catalyst comprising a tablet being formed with 0 to 8% graphite powder substantially free of chromium, the catalyst comprising a tablet having a pore volume from 0.2 ml/g to 0.6 ml/g and a bulk density of 0.7 g/ml to 1.5 g/ml, the solid catalyst having a bimodal pore size distribution centering around 100 Å and between 500 Å and 2000 Å and having a surface area of 20m2/g to 200m2/g, the catalyst having a calculated alumina content 30% to 60% by weight, the calculated CuO content is 70% to 40% by weight, the catalyst having a promoter being present in an amount no greater than 25% by weight of the catalyst and being chosen from the group consisting of salts and oxides of Ce, Mn, Ba and Ni in a catalytic reaction chosen from the group consisting of hydration of acrylonitrile to acrylamide, alkylation of a phenol with alcohol, amination of an alcohol, dehydrogenation of an alcohol, hydration of a nitrile, oxidation of carbon monoxide, oxidation of a vapor organic compound, oxidation of sulfur dioxide, oxidation of an alcohol, decomposition of nitric oxide, selective catalytic reduction of nitric oxide, and purification of a gas stream by the removal of oxygen.
摘要:
A reaction device according to the present invention is used in production of aldehyde from alcohol. The reaction device includes a reactor having a reaction field where a catalyst is provided inside and a reaction fluid flows. The catalyst has a surface extending in the direction of flow of the reaction fluid and contains Cu.
摘要:
An organic synthesis method in which a metal compound stable in water and functioning as a Lewis acid is used as a novel Lewis acid catalyst in a reaction system employing water as part or all of the solvent, wherein the compound gives a metal ion having a hydrolysis constant (pKh) of 4.3 to 10.1 and a water exchange rate constant (WERC) of 3.2x10?6 M-1sec-1¿ or larger.
摘要:
The present invention concerns a process for selectively removing nitrogen oxides (NOx) from exhaust or flue gasses, especially from gases arising from the burning of biomass, combined biomass-fossil fuel and from waste incineration units, and a catalyst for this process. The process relates to the selective catalytic reduction (SCR) of NOx with ammonia as reductant which is the most common method to catalytically reduce NOx in flue gasses from stationary sources. SCR systems are designed to clean the nitrogen dioxide (NO 2 and nitrogen oxide (NO) out of flue gasses. The present invention relates to a process for the selective removal of nitrogen oxides in the presence of ammonia from gases containing a significant amount of alkali metal and/or alkali-earth compounds which process comprises using a catalyst combined of a) a formed porous superacidic support b) a metal oxide catalytic component deposited on said support selected from the group consisting of Cu, V, Fe, Cr, Mn, Mo and mixtures thereof. The support can e.g. be obtained by the adsorbing of sulfate ions onto amorphous or crystalline inorganic oxide of Zr, Ti, Fe, Sn, Si, Al, and Hf, followed by calcination in air.
摘要:
Disclosed is a photocatalyst activation system characterized by including (a) a catalyst which includes a photocatalytic material containing cerium oxide, or a catalyst which includes a photocatalytic material containing at least one oxide selected from the group consisting of transition metal oxides other than cerium oxide; (b) a light source which irradiates the catalyst with light; and (c) a heat transfer device which transfers heat to the catalyst. By this photocatalyst activation system, it is possible to widen a usable wavelength range of light, and to enhance the catalytic activity to a large extent.
摘要:
The invention provides a process which enables, in preparation of acrolein by catalytic gas-phase oxidation of propylene in the presence of molecular oxygen or a molecular oxygen-containing gas or in preparation of acrylic acid by catalytic gas-phase oxidation of acrolein in the presence of molecular oxygen or a molecular oxygen-containing gas, using single kind of atalyst, to suppress occurrence of localized extraordinarily high temperature spots (hot spots) in the catalyst layer and can stably maintain high acrolein or acrylic acid yield for a long time. The process is characterized by use of an oxide catalyst containing molybdenum as an essential component and having relative standard deviation of its particle size in a range of 0.02 to 0.20.
摘要:
Oxychlorination catalyst compositions which include a catalytically effective amount of an oxychlorination catalyst and a diluent having certain chemical composition and/or physical properties are disclosed. Processes using such oxychlorination catalyst compositions are also described. Some oxychlorination catalyst compositions and processes disclosed herein can increase the optimal operating temperature, and thereby increase the production capacity of an existing reactor, such as a fluid-bed reactor, compared to other oxychlorination catalyst compositions.