摘要:
The present invention relates to a catalyst for preparing carboxylic acids and/or carboxylic anhydrides, which has a plurality of catalyst zones arranged in series and has been produced using a vanadium antimonate having a maximum content of crystalline valentinite of 5% by weight. The present invention further relates to a process for gas-phase oxidation in which a gas stream comprising at least one hydrocarbon and molecular oxygen is passed through a catalyst which has a plurality of catalyst zones arranged in series and has been produced using a vanadium antimonate having a maximum content of crystalline valentinite of 5% by weight.
摘要:
The invention relates to a catalyst system and process for preparing dimethyl ether from synthesis gas as well as the use of the catalyst system in this process.
摘要:
The invention relates to a catalyst molded body for preparing maleic anhydride by gas-phase oxidation of a hydrocarbon having at least four carbon atoms using a catalytically active composition containing vanadium, phosphorus and oxygen. The shaped catalyst body has an essentially cylindrical body having a longitudinal axis. The cylindrical body has at least two parallel internal holes which are essentially parallel to the cylinder axis of the body and go right through the body. The catalyst molded body has a large outer surface area, a lower pressure loss and sufficient mechanical stability.
摘要:
The present invention relates to a catalytically active composition for the selective methanation of carbon monoxide in reformate streams comprising hydrogen and carbon dioxide, comprising at least one element selected from the group consisting of ruthenium, rhodium, nickel and cobalt as active component and rhenium as dopant on a support material. The catalyst according to the invention is preferably used for carrying out methanation reactions in a temperature range from 100 to 300° C. for use in the production of hydrogen for fuel cell applications.
摘要:
The invention relates to a catalyst and catalyst layer and process for preparing dimethyl ether from synthesis gas or methanol as well as the use of the catalyst or catalyst layer in this process.
摘要:
The present invention relates to a catalyst for preparing carboxylic acids and/or carboxylic anhydrides, which has a plurality of catalyst zones arranged in series and has been produced using a vanadium antimonate having a maximum content of crystalline valentinite of 5% by weight. The present invention further relates to a process for gas-phase oxidation in which a gas stream comprising at least one hydrocarbon and molecular oxygen is passed through a catalyst which has a plurality of catalyst zones arranged in series and has been produced using a vanadium antimonate having a maximum content of crystalline valentinite of 5% by weight.
摘要:
A method for materials recovery from a catalyst comprising oxides of iron, cerium, molybdenum, and potassium, in which potassium and molybdenum are removed by treating the catalyst with an aqueous leachant, giving an aqueous solution S1 comprising potassium and molybdenum, and a solid residue R1 comprising cerium oxide and iron oxide, and recovering cerium in the form of a solid comprising a cerium(III) compound or cerium(IV) oxide from the solid residue R1.