Catalyst for the epoxidation of alkenes

Patent metadata

Field	Value
Publication number	US-2016297781-A1
Application number	US-201415102654-A
Country	US
Kind code	A1
Filing date	Dec 1, 2014
Priority date	Dec 9, 2013
Publication date	Oct 13, 2016
Grant date	—

Abstract

The present invention relates to a catalyst for the epoxidation of alkenes, comprising silver, rhenium, cesium, lithium, tungsten and sulfur on a support. The present invention further relates to a process for producing the catalyst and the use of the catalyst for the oxidation of alkylenes to alkylene oxides. In addition, the present invention relates to a process for preparing ethylene oxide from ethylene, which comprises the oxidation of ethylene with oxygen in the presence of said catalyst.

First claim

1 .- 13 . (canceled)

14 . A catalyst for the epoxidation of alkenes, comprising silver, rhenium, cesium, lithium, tungsten and sulfur on a support, wherein the tungsten has been deposited on the support as a tungsten compound with a sulfur to tungsten atomic ratio of 150 ppm or less.

15 . A catalyst according to claim 14 , wherein the support is an aluminum oxide support.

16 . A catalyst according to claim 14 , wherein the support is an alpha-aluminum oxide with a purity of at least 85%.

17 . A catalyst according to claim 14 , wherein the support has a bimodal pore size distribution.

18 . A catalyst according to claim 14 , wherein the support has a bimodal pore size distribution comprising at least pores having a pore diameter in the range from 0.1 to 15 μm and pores having a pore diameter in the range from 15 to 100 μm.

19 . A catalyst according to claim 14 , wherein the support has a BET surface area in the range from 0.6 to 1.3 m 2 /g.

20 . A catalyst according to claim 14 , comprising silver in an amount of from 10 to 25% by weight, rhenium in an amount of from 150 to 450 ppm, cesium in an amount of from 100 to 600 ppm, lithium in an amount of from 50 to 300 ppm, tungsten in an amount of from 80 to 250 ppm and sulfur in an amount of from 5 to 150 ppm on a support, wherein the tungsten has been deposited on the support as a tungsten compound with a sulfur to tungsten atomic ratio of 150 ppm or less.

21 . A catalyst according to claim 14 , comprising at least one further promoter selected from the group consisting of sodium, potassium, rubidium, beryllium, magnesium, calcium, strontium, barium, manganese, molybdenum, cadmium, chromium, tin and mixtures of two or more thereof.

22 . A process for producing catalysts for the epoxidation of alkenes, comprising depositing silver, rhenium, cesium, lithium, tungsten and sulfur on a support, wherein the tungsten has to be deposited on the support as a tungsten compound with a sulfur to tungsten atomic ratio of 150 ppm or less.

23 . The process according to claim 22 , further comprising a drying step.

24 . The process according to claim 22 , further comprising calcination at a temperature in the range of from 270 to 295° C.

25 . A process for preparing ethylene oxide from ethylene, which comprises oxidating ethylene in the presence of the catalyst according to claim 14 .

26 . A process for the epoxidation of alkenes which comprises utilizing the catalyst according to claim 14 .

Assignees

• Basf Se

Inventors

• Zakzeski Joseph J

Classifications

• B01J35/55

  Cylinders or rings · CPC title

• B01J37/0236

  Drying, e.g. preparing a suspension, adding a soluble salt and drying · CPC title

• B01J21/04

  Alumina · CPC title

• B01J37/088

  Decomposition of a metal salt · CPC title

• B01J37/0215

  Coating · CPC title