Patent ID: 7389638

Claim:
An exhaust gas cleaning system for a combustion source comprising: a) a H 2 rich gas generator system, b) a sulfur oxides trap, and c) a nitrogen storage reduction (NSR) catalyst trap, wherein the NSR catalyst trap is positioned downstream of the sulfur oxides trap and the H 2 rich gas generator system, wherein the sulfur oxides trap releases sulfur atom species during regeneration under a rich fuel to air ratio condition to the downstream NSR catalyst trap, wherein the NSR catalyst trap is at a temperature of from about 400 to about 600° C. in the presence of H 2 from the H 2 rich gas generator system, and 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, and wherein the sulfur atom species released by the sulfur oxides trap pass through the NSR catalyst trap with no poisoning of the NOx storage and NOx reduction components.