Catalysts for controlling auto exhaust emissions including hydrocarbon, carbon monoxide, nitrogen oxides and hydrogen sulfide and method of making the catalysts
US4780447A · kind A · utility
50Cited by
3References
34Claims
0Family size
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Key dates
| Filing date | Jul 10, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | Jul 10, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst, which is capable of controlling not only HC, CO and NOx, but also H.sub.2 S emission from the tail pipe of catalytic converter-equipped automobiles, is made of noble metals promoted with ceria-rich rare earth oxides, preferably doubly promoted along with alkali metal oxides, and oxides of nickel and/or iron as an H.sub.2 S gettering ingredient. The oxides of nickel and/or iron are present in an H.sub.2 S gettering effective amount and in an amount up to 10 wt %. The alumina support can have additionally from 0 to 20% SiO.sub.2 present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.