Catalyst for reducing pollutants in waste gas streams and process for preparing the catalyst
US4206087A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1977 |
| Grant date | Jun 3, 1980 |
| Priority date | — |
| Expiry date | Jan 6, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Macrosized catalysts suitable for promoting chemical reactions, especially to reduce pollutants in waste gas streams such as automobile exhaust, are described. The catalysts have one or more metal components, especially a platinum group metal component, as a catalytic promoter combined with a high surface area, refractory oxide support. Alumina is added to the macrosize catalyst to provide protection against poisoning by extraneous materials such as lead, zinc, other metals, sulfur or phosphorus with which the catalysts may come in contact during use. These catalysts may have a relatively catalytically-inactive carrier, especially a monolithic carrier which may be of the honeycomb type.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.