Platinum group metal catalyst on the surface of a support and a process for preparing same
AssigneePhillips Petroleum Company
InventorsRoger N. McGinnis, Lewis E. Drehman, Emory W. Pitzer
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Abstract
Platinum or other platinum-group metals can be deposited substantially on the surface only of pellets of a refractory catalyst support by impregnation with an aqueous solution of such as hexammonium platinum tetrasulfite. The resulting catalysts contain relatively small total amounts of platinum-group metal positioned primarily at the surface, yet are as highly active as catalysts uniformly impregnated throughout the body of the pellet and containing much larger amounts of platinum-group metal. The catalyst further can contain thenium.
Claims25
A method for preparing a supported platinum-group metal catalyst which comprises impregnating a porous support with an aqueous solution of a platinum-group metal sulfite and a rhenium compound, drying the thus-prepared composite, and heating the thus-dried composite at a temperature sufficient to decompose said sulfite, thereby producing said supported platinum-group metal catalyst, wherein said platinum-group metal is substantially deposited at the surface of said support and said platinum-group metal is at least one of platinum, iridium, osmium, palladium, rhodium, or ruthenium.
A method for preparing a supported platinum-group metal catalyst which comprises
- (a) soaking a porous support in water, methanol, isopropanol, ethylene glycol, or mixture thereof, effective to substantially pre-wet the pores of said porous support;
- (b) impregnating said pre-wetted porous support with an aqueous solution of a platinum-group metal sulfite, optionally with a rhenium compound;
- (c) drying the thus-prepared composite;
- and
- (d) heating the thus-dried composite of a supported platinum-group metal catalyst, wherein said platinum-group metal is substantially deposited at the surface of said support, and said platinum-group metal is at least one of platinum, iridium, osmium, palladium, rhodium, or ruthenium.
Dependencies are inferred from the claim text.