Nickel-Based Catalysts\nfor Dry Reforming of Methane\nin the Absence/Presence of H<sub>2</sub>S: Effect of SiO<sub>2</sub> and Cu

Dry\nreforming of methane (DRM) can utilize methane and carbon dioxide\nto produce synthesis gas. The nickel-based catalysts used in the DRM\nare easily poisoned by H<sub>2</sub>S in the feed gas. This study\nevaluated the effect of SiO<sub>2</sub> and Cu on the Ni/Al<sub>2</sub>O<sub>3</sub> catalyst during DRM in the absence/presence of H<sub>2</sub>S. XRD, N<sub>2</sub> adsorption/desorption, TEM, XPS, H<sub>2</sub>-TPR, CO<sub>2</sub>-TPD, and TGA were used to characterize\nthe catalysts. The results show that in the absence of H<sub>2</sub>S, adding SiO<sub>2</sub> can effectively reduce the amount of coke\non the catalyst surface, whereas adding Cu can effectively change\nthe nature of coke to more reactive filament carbon. The presence\nof H<sub>2</sub>S facilitates coke deposition on the catalyst surface.\nThe synergistic effect of strengthening the metal–support interaction\nby SiO<sub>2</sub> and absorbing H<sub>2</sub>S by Cu results in simultaneous\ncoke and sulfur resistance of the NiAl1Si3Cu catalyst.