公开(公告)号：WO2022161924A1

公开(公告)日：2022-08-04

申请号：PCT/EP2022/051551

申请日：2022-01-25

Applicant: BASF SE

Inventor： KARPOV, Andrey ,  ALMER, Christian ,  WALSDORFF, Christian ,  LEHR, Andreas ,  NIKOLAY, Michael ,  BARTOSCH, Christian ,  GROBYS, Mauricio

IPC: B01J23/68 ,  B01J37/02 ,  B01J21/04 ,  B01J35/02 ,  B01J35/10 ,  C07D301/10

Abstract: An epoxidation catalyst comprising silver, cesium, rhenium and tungsten deposited on an alumina support, wherein the catalyst comprises 20 to 50 wt.-% of silver, relative to the weight of the catalyst, an amount of cesium Ccs of at least 7.5 mmol per kg of catalyst, and an amount of rhenium CR6 and an amount of tungsten Cw so as to meet the following requirements: CRe ≥ 6.7 mmol per kg of catalyst; and CRe + (2 χ cw) ≥ 13.2 mmol per kg of catalyst. The epoxidation catalyst allows for a more efficient conversion of ethylene oxide by gas-phase oxidation of ethylene, particularly displaying high selectivity and high activity. The invention also relates to a process for preparing an epoxidation catalyst as defined in above, comprising i) impregnating an alumina support with a silver impregnation solution; and ii) subjecting the impregnated refractory support to a calcination process; wherein steps i) and ii) are optionally repeated, and at least one silver impregnation solution comprises rhenium, tungsten and cesium. The invention moreover relates to a process for producing ethylene oxide by gas-phase oxidation of ethylene, comprising reacting ethylene and oxygen in the presence of an epoxidation catalyst according to any one of the preceding claims.