Patent ID: 6403524
Filing Date: 2002-06-11
Classification: B01J,C07C

Abstract:
A chromia-based fluorination catalyst comprising zinc or a compound of zinc in an amount of less than about 3% by weight of the catalyst, and having an apparent degree of crystallinity of from 8% to 50% by weight, as determined by X-ray diffraction analysis using the standard NIST technique and comparing the result obtained with that obtained by analysis of pure alpha chromia standard prepared by sintering chromia at 1223K in air for 24 hours, which catalyst is obtained by inducing crystallinity in chromia and subsequently introducing zinc or a compound of zinc into the crystallized chromia by impregnation with a solution of soluble zinc salt or by inducing crystallization in a chromia catalyst comprising zinc or a zinc compound, essentially in the absence of H2 gas.