摘要:
The present invention relates to novel mesoporous mixed metal oxide catalysts and a method for the preparation thereof, as well as the use thereof as a catalyst in the oxidation of hydrocarbons or partially oxidized hydrocarbons. More specifically, the present invention relates to mesoporous mixed metal oxide catalysts comprising at least two, preferably at least three different metal species, at least one of which belongs to the group of transition metals, a method for the preparation thereof, which comprises a production step over the neutral templating route and a calcination step in a substantially oxygen-free atmosphere at a temperature between 300 to 700°C, and the use of such catalysts as oxidation catalyst in the preparation of oxidized hydrocarbons, and especially the selective oxidation or ammoxidation of propane to acrylic acid and acrylonitrile, respectively. A more preferred catalyst comprises Mo, V, Te and Nb.
摘要:
The present invention concerns a method for the preparation of a metal oxide catalyst comprising oxides of molybdenum (Mo), vanadium (V), tellurium (Te) and niobium (Nb) and having a modified surface structure, comprising the steps of (i) providing a calcined catalyst material comprising oxides of Mo, V, Te and Nb, (ii) treating this material with a treating agent selected from water and an aqueous solution of an acid or a base. (iii) separating the treated catalyst from the treating agent; and further a catalyst, obtainable by this process, and the use of this catalyst in oxidation reactions of hydrocarbons or partially oxidized hydrocarbons.
摘要:
The present invention relates to carbon-carbon composite material comprising a carbonaceous carrier and nanosize carbon structures (e.g. CNT or CNF), wherein the nanosize carbon structures are grown on the carbonaceous carrier. The carrier may be porous, as in activated carbon or consists of carbon black particles. In accordance with the invention, nanocarbon growth in the pores of porous carriers can be realized. The process for the manufacture of a this carbon-carbon-composite material comprises the steps of treating a carbonaceous carrier material with a metal-containing catalyst material, said metal being capable of forming nanosize carbon structures, and growing nanosize carbon structures by means of a CVD (chemical vapour deposition) method on the treated carrier in a gas atmosphere comprising a carbon-containing gas, followed by an optional surface modification step. This process allows optimising porosity, hydrodynamical properties and surface chemistry independently from each other, which is particularly beneficial in respect of the use of the composite for water purification. Carbon black-based composites are particularly useful for filler applications.