Patent ID: 9597659
Date: 2017-03-21
CPC Classifications: B01J,C07C,C11C,Y02E

Claim:
1. A catalyst with a zinc aluminate base, free from ZnO, alumina and ZnAl 2 O 4 , the zinc aluminate base of which comprises a single zinc aluminate phase of the spinel type surstoichiometric in zinc in which a portion of the zinc atoms occupy octahedral sites and the Zn/Al atomic ratio is 0.56-0.58, said catalyst prepared by a process comprising: a) co-precipitation involving the mixing of precursors of zinc II and aluminium III in a Zn/A1 atomic ratio of 0.56-0.58, in the presence of a base, at a pH of 6.1-6.9, and at a temperature of 30-50° C.; b) filtration of precipitate obtained; c) optionally washing to remove residual species; d) drying at a temperature of 80-175° C.; e) calcination in the presence of oxygen at a temperature of 500-800° C.