Patent ID: 8685353

Claim:
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: a) a H 2 rich gas generator system, b) a regenerable sulfur oxides trap, and c) a regenerable nitrogen storage reduction (NSR) catalyst trap, wherein the sulfur oxides trap comprises a catalyst selected from oxide of Fe, Co, Ag, Cu, Mn, Ce, Ceâ€”Zr, Ceâ€”Fe, Mnâ€”Laâ€”Zr, Feâ€”Laâ€”Zr, Cuâ€”Laâ€”Zr, Coâ€”Laâ€”Zr Ptâ€”Ba, Pt, and combinations thereof, and wherein the NSR catalyst trap is positioned downstream of the sulfur oxides trap and the H 2 rich gas generator system, ii) regenerating the sulfur oxides trap and the NSR catalyst trap with the H 2 rich gas and a fuel rich fuel to air exhaust gas, and iii) maintaining the NSR catalyst trap at a temperature of from about 400 to about 600Â° C. in the presence of H 2 from the H 2 rich gas generator system at an atomic ratio of H 2 to the released sulfur atom species of greater than or equal to about 65 during regeneration of the sulfur oxides trap, wherein the sulfur atom species released by the sulfur oxides trap pass through the NSR catalyst trap with no poisoning of the NO x storage and NO x reduction components.