Catalytic hydrolysis of COS over calcined CoNiAl hydrotalcite-like compounds modified by cerium

The catalytic performance of COS hydrolysis over calcined CoNiAl hydrotalcite-like compounds (HTLCs) modified by cerium was investigated. All catalysts were prepared by thermal decomposition of hydrotalcite-like precursors synthesized by co-precipitation method and characterized by various technologies. Among all catalysts studied, catalyst CoNiAl-50 exhibited excellent COS conversion. The changes of structural properties, oxidative properties of catalysts and increase of surface defect sites mainly accounted for the enhancements of the catalytic activities with addition of cerium. Element sulfur and the sulfate species accumulated on the surface which might contribute to catalyst poisoning and Ce could affect the formation and content of element sulfur and sulfate.