The Investigation of Active Sites on Nickel Oxide Based Catalysts towards the In-situ Reactions of Methanation and Desulfurization

摘要

Supported nickel oxide based catalysts of Fe/ Co/ Ni (10: 30: 60)-Al 2 O 3 and Pr/ Co/ Ni (5: 35: 60)-Al 2 O 3 that were prepared by wetness impregnation method showed potential catalysts for the in-situ reactions of H 2 S desulfurization and CO 2 methanation from ambient temperature up to 300 o C. ? X-ray Photoelectron Spectroscopy revealed Ni 2 O 3 and Fe 3 O 4 as the surface active components on the Fe/ Co/ Ni (10: 30: 60)-Al 2 O 3 catalyst, while Ni 2 O 3 and Co 3 O 4 on the Pr/ Co/ Ni (5: 35: 60)-Al 2 O 3 catalyst. ? Energy Dispersive X-ray analysis indicated the presence of 2.7 % and 0.9 % of sulfur on the spent Fe/ Co/ Ni (10: 30: 60)-Al 2 O 3 and Pr/ Co/ Ni (5: 35: 60)-Al 2 O 3 catalysts, respectively. ? N 2 adsorption-desorption analysis showed reduction of 5.5 % on the surface area of the spent Fe/ Co/ Ni (10: 30: 60)-Al 2 O 3 catalyst. However, the surface area of the spent Pr/ Co/ Ni (5: 35: 60)-Al 2 O 3 catalyst increased by 8.6 %.