Precisely constructing Ce-loaded sulfur resistant catalyst for efficient methane dry reforming

Abstract

Previous studies have shown that pure cerium dioxide as Lewis acid-base catalyst can effectively resist sulfur poisoning. At a certain H2S concentration, it can effectively promote methane dry reforming reaction, while the selection of a suitable support is of great significance to reduce the dosage of cerium, thus reducing the production cost and improving the reaction efficiency simultaneously. The hydroxyapatite (HAP) chosen as the support in this work has the advantages of low cost, easy preparation and high stability. Meanwhile, it is verified that ion exchange occurred on the surface of HAP contributes to higher amount of Ce3+ and oxygen vacancies, when compared with other carriers, as proved by XPS, Raman, EPR, and in situ NH3-DRIFTS, thus forming higher amount of Lewis acid-base active sites and improving the reforming activity. Besides, H2S acceleration mechanism over oxygen vacancy induced catalyst is also proposed in this work.