PROCESS, CATALYST SYSTEM, AND APPARATUS FOR TREATING SULFUR COMPOUND CONTAINING GASEOUS EFFLUENT

摘要

The process contacts a gaseous stream (1) containing gaseous sulfur compounds and NOx with a catalyst system of either: an oxidation catalyst disposed on a high surface area support or an absorber material; or of discrete beds of a catalyst/sorber (A) comprising a noble metal catalyst component, a metal oxide sorber component, and a modifier; and an oxidation catalyst (B) disposed on a high suface area support or an absorber material. The sulfur and NOx compounds are removed from the exhaust (1) into catalyst system and retained therein to remove and retain the sulfur and NOx compounds. The reducing and regenerating gas (8) removes and retains said sulfur compounds and NOx is restored. In the two bed system, the catalyst system is regenerated with a regenerating gas (8) flowing in a direction reversed from direction of the exhaust gas (1).