Chrome-alumina extruded catalysts - of increased strength by impregnating mixed easily and difficultly peptized alumina particles with aq. chromic acid

摘要

The resultant paste is extruded to small catalyst balls. The alumina difficult to peptize opt consists of well - crystallised gibbsite, bayerite, and/or boehmite, or alumina calcined at 200 degrees C, and the other, easy to peptize, opt consists of a mixture of pseudoboehmite and bayerite, in which there is 30 - 100 (50 - 100)% pseudoboehmite. The number of operations is reduced, use of nitric acid is avoided, excess impregnation agent is not required, selectivity is improved, Cr2O3 is uniformly distributed on the alumina, time required is reduced, and if clay binders are present, the introduction of substances altering the catalytic properties is obviated.