Patent ID: 6870014

Claim:
A catalyst which comprises a catalytically active amount of at least one oxygen-containing molybdenum and/or tungsten compound on an oxidic support material said catalyst having a molybdenum and/or tungsten content, based on the finished catalyst, of: x μmol of (tungsten and/or molybdenum)/m 2 where 10.1<x<20.9, and a porosity comprising transport pores having a diameter of >25 nm, and a volume of these transport pores of at least 50 mm 3 /g and which is prepared by the following process steps; precipitation of the oxidic support material, thermal treatment of the oxidic support material to obtain a BET surface area of 185-220 m 2 /g at a temperature of from 300 to 550° C. application of the catalytically active compound(s) or its/their precursor compound(s), to which pore formers have been added, to the support material and calcination of the resulting catalyst at a temperature of from 400° C. to 900° C. to give the finished catalyst.