ZHU Quanli

(Department of Chemistry, Hanshan Normal University, Chaozhou 521041, China)

Abstract: The unpromoted- and the nickel promoted-molybdenum-based catalysts were investigated using temperature-programmed technique. Temperature programmed hydrogenation of thiophene, benzene, and cyclohexene were carried out. In order to probe the surface properties of sulfided molybdenum-based catalyst, temperature-programmed reduction (TPR), temperature-programmed desorption (TPD) and temperature programmed oxidation (TPO) of sulfide catalyst, were conducted. The results showed that the added nickel adjusted Mo-S bond of sulfide phase in catalyst, which led to the easy formation of the coordinatively unsaturated sites—active sites for hydrodesulfurization (HDS), thus facilitated adsorption of substrates, followed by the successful reaction. Also the added nickel weakened the binding force of H atoms stored in sulfide catalyst, which led to the easy formation of spillover hydrogen. These promotions were confirmed by the hydrogenation of thiophene and cyclohexene. 

Key words: TPH; TPO; HDS; Molybdenum-based Catalyst

E-mail: qlzhstc@sina.com 

Journal of Molecular Catalysis, Vol. 25, Issue 6, 2011, 527-533