Patent ID: 8685353
Filing Date: 2014-04-01
Classification: B01D,F01N

Abstract:
1. A method for improving the treatment of exhaust gas comprising the steps of: i) providing a combustion source with an exhaust gas cleaning system comprising: wherein the sulfur oxides trap comprises a catalyst selected from oxide of Fe, Co, Ag, Cu, Mn, Ce, Ce—Zr, Ce—Fe, Mn—La—Zr, Fe—La—Zr, Cu—La—Zr, Co—La—Zr Pt—Ba, Pt, and combinations thereof, and wherein the NSR catalyst trap is positioned downstream of the sulfur oxides trap and the H ii) regenerating the sulfur oxides trap and the NSR catalyst trap with the H iii) maintaining the NSR catalyst trap at a temperature of from about 400 to about 600° C. in the presence of H wherein the sulfur atom species released by the sulfur oxides trap pass through the NSR catalyst trap with no poisoning of the NO