Molybdenum Promoted Nickel Silicate BEA-Type Zeolite Catalyst for Dry Reforming of Methane

Dry reforming of methane (DRM) has garnered significant attention because it is featured by the conversion of the two most representative greenhouse gases CH₄ and CO₂ into syngas composed of H₂ and CO as target products. In our previous studies, we demonstrated the high catalytic activity and stability in DRM for the nickel silicate BEA-type zeolite (Ni-BEA) catalyst synthesized by interzeolite transformation. Here, the molybdenum modified Mo/Ni-BEA was prepared by deposition precipitation method on Ni-BEA, and its DRM activity was evaluated. Compared to the bare Ni-BEA, the modified Mo/Ni-BEA showed the more enhanced activity and stability with low carbon deposition, e.g., 9% lower coke content after 12 h on stream under harsh DRM reaction conditions, because of the promoter effect of molybdenum. Furthermore, Mo/Ni-BEA exhibited the stronger stability, i.e., both the deactivation rates for CH₄ and CO₂ were less than half compared to those of Ni-BEA, in a long-term DRM test for 55 h. To investigate the role of molybdenum as a promoter, the catalysts before and after reactions were analyzed through various characterization methods.