Dry Reforming of Methane on Ni/SBA-15 Catalysts Prepared by Citrate-Assisted Impregnation: Effect of Various pH Values of the Preparation Solution on Structure and Catalytic Properties

The dry reforming of methane (DRM) is a kind of technology used for achieving resource utilization. In this paper, different Ni/SBA-15 catalysts were prepared by adjusting the pH of the impregnation solution and applying it during the DRM reaction. The relationship between the structure and catalytic performance of the catalyst was analyzed by characterization methods such as BET, XRD, H2-TPR, H2-TPD, XPS, TG, and Raman. The research results indicated that the dispersion of the catalyst’s active components could be regulated by changing the pH value of the impregnation solution. Among them, the Ni/SBA-15-2 catalyst exhibits good metal dispersion, and significantly enhances the activity of the catalyst. In addition, it also has strong CO2adsorption capacity, which improves the stability of the catalyst. At 700 °C, the conversions of CH4and CO2of the catalyst are 51% and 60%, respectively.