| 摘要 |
<p>The present invention relates to a method and a catalyst composite useful for reducing contaminants in exhaust gas streams, especially gaseous streams containing sulfur oxide contaminants. More specifically, the present invention is concerned with a method for removing NOX and SOX contaminants from a gaseous stream comprising providing a catalyst composite having a downstream section and upstream section. The downstreams section comprises a first support, a first platinum component, and a NOX sorbent component. The upstream section comprises a second support, a second platinum component, and a SOX sorbent component selected from the group consisting of oxides of Mg, Zn, Mn, Fe, and Ni. In a sorbing period, a lean gaseous stream comprising NOX and SOX is passed within a sorbing temperature range through the upstream section to sorb at least some of the SOX contaminants and thereby provide a SOX depleted gaseous stream exiting the upstream section and entering the downstream section. The downstream section sorbs and abates the NOX in the gaseous stream and thereby provides a NOX depleted gaseous stream exiting the downstream section.</p> |
