Catalyst for purifying exhaust gases
US4102813A · kind A · utility
6Cited by
15References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1975 |
| Grant date | Jul 25, 1978 |
| Priority date | — |
| Expiry date | Apr 16, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst for purifying exhaust gases, comprising a carrier composed mainly of active alumina, containing near its surface a component to promote the transformation of active alumina to .alpha.-alumina when said carrier is subjected to a heat treatment in order to make the diameters of the pores near its surface larger than those of the pores in its interior, impregnated with an active catalytic component which permeates further into a portion of the interior deeper than the layer having the alumina transformation-promoting component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.