Sulfur poisoning of nickel-based hot gas cleaning catalysts in synthetic gasification gas

Abstract

The sulfur distribution and content of nickel catalyst beds were analyzed to account for poisoning effects of sulfur on the activities of catalysts which decompose tar, ammonia and methane in synthetic gasification gas. The desorption behavior of chemisorbed sulfur from the bed materials was monitored by temperature programmed hydrogenation (TPH). Sulfur adsorbs on nickel catalysts in different chemical states depending on the process conditions. At>900°C the sulfur adsorbs on the catalyst forming an irreversible monolayer on catalyst surfaces, while at