SUPPORTED CATALYSTS CONTAINING VANADIUM PENTOXIDE, TITANIUM DIOXIDE, PHOSPHORUS, RUBIDIUM AND/OR CESIUM WITH OR WITHOUT ZIRCONIUM DIOXIDE

摘要

ABSTRACT OF THE DISCLOSURE:A supported catalyst, containing vanadium pentoxide,titanium dioxide, phosphorus, rubidium and/or cesium, with orwithout zirconium dioxide, in which the catalytic materialcontains from 1 to 40% by weight of V2O5, from 60 to 99% byweight of TiO2 and any optionally added IrO2 and, based on thetotal amount of ?iO2, ?rO2 and V2O5, up to 2% by weight ofphosphorus and up to 1.5% by weight of rubidium and/or cesium,and which comprises two layers, of which the inner layercontains more than 0.2 and up to 2% by weight of phosphorus, butno rubidium and/or cesium, and the outer layer contains from 0to 0.2% by weight of phosphorus and from 0.02 to 1.5% by weightof rubidium and/or cesium, the outer layer accounting for from10 to 90% by weight of the total catalytic material.