Aldehyde or ketone prodn. by alcohol dehydrogenation - with a doped zinc chromite catalyst contg. extra chromium oxide

摘要

In a process for the prodn. of aldehydes or ketones by dehydrogenation of prim. or sec. 5-15C alcohols in the presence of a Zn chromite catalyst (ZnO:Cr2O3 molar ratio=0.8-1.2:0.5-0.8) doped with 2-10 wt.% CuO and 0.5-5 wt.% CdO, an additional 5-15 (pref. 8-10) wt.% Cr2O3 is incorporated in the catalyst by adding NH4 dichromate and heating at 300-450 degrees C. Addn. of Cr2O3 increases the activity selectivity and life of the catalyst; dehydration side reactions are totally eliminated and by-product formation (aldehydes or ketones with fewer C atoms) is limited to 1.5 wt.%; conversions of 85-90% can be achieved.