Catalyst for treating exhaust gases containing dioxines, production process for the catalyst and method of treating the exhaust gases
US5783515A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 27, 1995 |
| Grant date | Jul 21, 1998 |
| Priority date | — |
| Expiry date | Dec 27, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/2045
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A catalyst including a first catalyst ingredient which is at least one element selected from a group consisting of Pt, Pd and Ir, or oxides thereof; and further able to include at least one element selected from a group consisting of Au, Ag, Cu, Fe, Sb, Se, Te and Ta, or oxides thereof, as a second catalyst ingredient, carried on at least one of a silica-boria-alumina composite oxide or a zeolite with a silica-to-alumina molar ratio of more than 30, in amounts of from 0.1 to 10 g of the first catalyst ingredient and from 0.01 to 5 g of the second catalyst ingredient based on one liter of the catalyst with the second to first catalyst ingredient weight ratio being less than 1. The catalyst is used for treating exhaust gases by bringing the exhaust gases containing HCl and dioxines into contact with the catalyst to thereby eliminate the HCl and dioxines from the exhaust gases by oxidative decomposition while suppressing the subsequent formation of dioxines from precursors for the dioxines present in the exhaust gases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.