Patent ID: 11958040
Assignee: JOHNSON MATTHEY PUBLIC LIMITED COMPANY
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B

Claim 0:
1. A method for preparing an eggshell catalyst comprising the steps of: (i) preparing a calcined shaped alkaline earth metal aluminate catalyst support, (ii) treating the calcined shaped alkaline earth metal aluminate catalyst support with a gas containing water vapor to form a hydrated support, (iii) with or without an intervening drying step, impregnating the hydrated support with an acidic solution containing one or more catalytic metal compounds and drying the impregnated support, (iv) calcining the dried impregnated support, to form a calcined catalyst having a catalytic metal oxide concentrated at the surface of the support and (v) optionally repeating steps (ii), (iii) and (iv).