Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1978-08-01
1980-04-08
Shine, W. J.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252432, 252443, 252447, 252455R, 252457, 252459, 252462, 252464, 252465, 252466PT, 252466B, 252470, 252472, 252473, 252474, 252477R, 4232135, 423403, B01J 2104, B01J 2342, B01J 2374
Patent
active
041972171
ABSTRACT:
This invention relates to catalysts suitable for the catalytic oxidation of hydrocarbons and carbon monoxide and for the catalytic reduction of oxides of nitrogen in the presence, respectively, of suitable oxidizing and reducing means. The invention is especially concerned with catalysts which are suitable for the catalytic purification or control of the exhaust gases of petrol driven internal combustion engines and of diesel engines. Such catalysts have been variously described as "three-way", "polyfunctional" and "multi-functional" catalysts. In more detail a three way catalyst of the invention comprises a substrate having supported thereon at least one intermetallic compound of the general formula A.sub.x B.sub.y where A represents one or more Groups VIII metals having an atomic number not larger than 78; B represents one or more metals of the group consisting of Al, Sc, Y, the lanthanides, Ti, Zr, Hf, V, Nb and Ta and x and y are integers.
REFERENCES:
patent: 1978198 (1934-10-01), Handforth
patent: 2145651 (1939-01-01), Funk
patent: 3424619 (1969-01-01), Adlhart et al.
patent: 3840471 (1974-10-01), Acres
patent: 3920583 (1975-11-01), Pugh
patent: 3944504 (1976-03-01), Ford et al.
patent: 3979273 (1976-09-01), Panzera et al.
patent: 3999956 (1976-12-01), Stueber et al.
Gartshore Anthony
McGill Ian R.
Pratt Allin S.
Shutt Eric
Johnson Matthey & Co., Limited
Shine W. J.
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