Catalytic mixed oxide composition including antimony - with tungsten and/or molybdenum and additionally uranium and/or vanadium

摘要

A catalytic composition for use in organic reactions comprises oxides contg. antimony which have been heated at 700-900 degrees C in an oxygen-contg. gas, and to which has been added before or after the heat treatment, an oxide or cpd. of molybdenum and/or tungsten at 0.05-1 atm % and also an oxide or cpd. of uranium and/or vanadium at 0.005-0.5 ats. %. The catalyst is improved by addition of U and/or Va which enables a lower optimum temp. to be used without loss of yield. The composition is specif. used for preparating acrylonitrile from propylene, oxygen and ammonia.