公开(公告)号：US20240408585A1

公开(公告)日：2024-12-12

申请号：US18274042

申请日：2022-01-25

Applicant: BASF SE

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

IPC: B01J27/055 ,  B01J21/04 ,  B01J23/68 ,  B01J35/61 ,  B01J35/63 ,  B01J37/02 ,  B01J37/08 ,  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+(2χcw)≥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.

公开(公告)号：US20230114770A1

公开(公告)日：2023-04-13

申请号：US17914395

申请日：2021-03-26

Applicant: BASF SE

Inventor： Andrey KARPOV ,  Christian WALSDORFF ,  Thorsten JOHANN ,  Christian ALMER ,  Daniela RIECK ,  Christian BARTOSCH ,  Mauricio GROBYS ,  Tobias WEINLAND ,  Holger BORCHERT

IPC: B01J23/68 ,  B01J37/02 ,  B01J37/14 ,  B01J37/16 ,  C07D301/10

Abstract: A process for producing a silver-based epoxidation catalyst, comprising i) impregnating a particulate porous refractory support with a first aqueous silver impregnation solution comprising silver ions and an aminic complexing agent selected from amines, alkanolamines and amino acids; ii) converting at least part of the silver ions impregnated on the refractory support to metallic silver by heating while directing a stream of a first gas over the impregnated refractory support to obtain an intermediate catalyst, wherein the first gas comprises at least 5 vol.-% oxygen; iii) impregnating the intermediate catalyst with a second aqueous silver impregnation solution comprising silver ions, an aminic complexing agent selected from amines, alkanolamines and amino acids, and one or more transition metal promoters, in particular rhenium; and iv) converting at least part of the silver ions impregnated on the intermediate catalyst to metallic silver by heating while directing a stream of a second gas over the impregnated intermediate catalyst to obtain the epoxidation catalyst, wherein the second gas comprises at most 2.0 vol.-% oxygen, wherein the impregnated refractory support and the impregnated intermediate catalyst are each heated to a temperature of 200 to 800° C. The process of the invention surprisingly allows for obtaining a catalyst with high selectivity in a cost-efficient manner. The invention also relates to a silver-based epoxidation catalyst obtainable by such a process, and to a process for producing an alkylene oxide by gas-phase oxidation of an alkylene, comprising reacting an alkylene and oxygen in the presence of a silver-based epoxidation catalyst obtainable by the above process.