Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Mixture is exhaust from internal-combustion engine
Patent
1989-07-25
1991-06-18
Russel, Jeffrey E.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Mixture is exhaust from internal-combustion engine
B01D 5336
Patent
active
050248243
ABSTRACT:
This invention relates to a catalytic composite for treating an exhaust gas comprising a first support which is a refractory inorganic oxide having dispersed thereon at least one noble metal component and having dispersed immediately thereon an overlayer comprising at least one oxygen storage component and optionally a second support which is a refractory inorganic oxide. The first support may be selected from the group consisting of alumina, silica, titania, zirconia and aluminosilicates with alumina being preferred. Additionally, the noble metal component may be selected from the group consisting of platinum, palladium, rhodium, ruthernium and iridium. The oxygen storage component is an oxide of a metal which includes cerium, iron, nickel, cobalt lanthanum, neodymium, praesodymium, etc. and mixtures thereof. Cerium oxide is a preferred oxygen storage component. Finally, the second support may be selected from the group consisting of alumina, silica, titania, zirconia and aluminosilicates, with alumina preferred. This invention also relates to a process for minimizing the content of hydrogen sulfide in an automotive exhaust gas which comprises contacting said exhaust gas with a catalytic composite comprising a first support which is a refractory inorganic oxide having dispersed thereon at least one noble metal component and having dispersed immediately thereon an overlayer comprising at least one oxygen storage component and optionally a second support which is a refractory inorganic oxide.
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patent: 3931050 (1976-01-01), Asano et al.
patent: 4727052 (1988-02-01), Wan et al.
patent: 4760044 (1988-07-01), Joy, III et al.
patent: 4868148 (1989-09-01), Henk et al.
Hackh's Chemical Dictionary, 4th ed., Grant, ed., McGraw-Hill Book Co., 1969, p. 732.
Henk Michael G.
Summers, II Jack C.
Allied-Signal Inc.
Molinaro Frank S.
Russel Jeffrey E.
Ryther Mary Jo
Wells Harold N.
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