Back to results
US 5,691,269 AGranted
Process for preparing silver catalyst
AssigneeScientific Design Company, Inc.
InventorNabil Rizkalla
Life of this patent
Estimating the term…
Abstract
An improved silver catalyst for the oxidation of ethylene with molecular oxygen is made by impregnating a porous support with a silver salt of a neo acid; subjecting the impregnated support to a low temperature activation by heating at a temperature in the range of 250.degree. C. to 300.degree. C. on a moving belt in an atmosphere containing less oxygen than air, and post impregnating the support with an alkali metal, preferably cesium.
Claims12
A catalyst for the vapor-phase oxidation of ethylene to ethylene oxide comprising:
- a porous support having a surface area of about 0.1 to 2.0 m.sup.2 /g and a porosity of about 0.1 to 1.0 cc/g;
- and
- 3-20 wt % silver dispersed on said support such that there are from 10 to 70 particles of silver per square micron on the fresh catalyst.
A catalyst for the vapor-phase oxidation of ethylene to ethylene oxide comprising:
- a porous alpha-alumina/silica support having a surface area of about 0.4 to 1.6 m.sup.2 /g and a porosity of about 0.2 to 0.7 cc/g;
- 8-13 wt % silver dispersed on said support such that there are initially from about 10 to 20 particles of silver per square micron;
- and
- 1to 6.times.10.sup.-3 gew cesium/g on said support.
1 more element
Dependencies are inferred from the claim text.