GRAPHENE-SUPPORTED PALLADIUM NANOP ARTICLES WITH HIGH HYDRODESULFURIZATION ACTIVITY FOR CARBONYL SULFIDE

摘要

The sulfur-containing compounds in the coal gas include mainly hydrogen sulfide (above 90%) and organic sulfur, such as carbonyl sulfide (COS). Hydrogen sulfide can be removed successfully using metal oxides, whereas the removal of COS is difficult. Hydrodesulphurization (HDS) is one of the most appropriate methods for COS, because it not only has high efficiency and low pollution, but also it can directly use hydrogen in the coal gas without additional gas source [1]. Recently, there has been an increased interest in enhancing the activity of palladium (Pd) catalysts in hydrogenation reactions. Many carbon materials have been investigated as catalyst supports in improving the activity and stability of Pd catalysts employed in HDS reactions [2]. In particular, graphene sheets (GSs) which are considered promising candidates for new support materials to load Pt, Pd, and Au nanoparticles for applications in fuel cells and catalysis are receiving more and more attention, because of high surface area (theoretical value of 2630 m~2/g), extraordinary conductivity, unique graphitized basal plane structure and potential low manufacturing cost properties [3]. However, it is difficult to uniformly load metal nanoparticles (NPs) on GSs due to its hydrophobic properties, thus limiting the application of GSs for heterogeneous catalysis to some degree.