Abstract
Dry reforming of methane (DRM) can effectively convert two greenhouse gases into high-valued chemicals, in which the syngas produced by the reaction can be directly used as raw gases for Fischer–Tropsch synthesis and methanol synthesis. Ni-based catalysts for the DRM reaction with comparable initial activity to noble metals are the focus of most researchers, but their poor carbon deposition resistance easily causes their low stability. More importantly, the nickel loading will affect the catalytic activity and carbon deposition resistance of the catalyst. Herein, a series of Ni/Al2O3 catalysts with bimodal pores was prepared and characterized by X-ray diffraction (XRD), N2 physical adsorption–desorption, H2-temperature programmed reduction (H2-TPR), temperature programmed hydrogenation (TPH), Raman, and thermogravimetric analysis (TG). The results show that the interesting bimodal structure catalysts could provide a high surface area and contribute to the mass transfer. Besides, the catalytic performance of the DRM reaction is sensitive to nickel loadings. In this study, the Ni/Al2O3 catalyst with nickel loadings of 6% and 8% exhibited excellent catalytic activity and carbon deposition resistance. These findings will provide a new strategy to design a highly efficient and stable heterogeneous catalyst for industry.
Highlights
CH4 is the main component of natural gas
CH4 reforming to syngas is commonly found in three ways: steam reforming of methane (SRM), partial oxidation of methane (POM), and dry reforming of methane (DRM)
12%Ni-Al2O3-evaporation-induced self-assembly method (EISA) was 28%, much lower than that of 12%Ni- Al2O3-IMP by the inverse micro-emulsion technique performed with higher catalytic activity and better carbon which was 64%
Summary
CH4 is the main component of natural gas. It is a greenhouse gas with a greenhouse effect. Studies have shown that Ni-based catalysts have comparable initial activities to noble metals, but their poor carbon deposition resistance makes it easy to form carbon deposits on the catalyst surface. This causes the reaction tube pressure to rise and the catalytic activity to decrease. Co-Ni alloy, accelerating the gasification of coke intermediates Zhou and his co-workers [24] used a single-source precursor to generate a Ru-Ni-MgO catalyst and the Ni-rich Ru-Ni alloy was identified as a carbon-resistant catalyst in CH4 -CO2 reforming, for Ru, slowing down the carbon deposition rate via elevating the methane dissociation barrier. The relationship between properties of bimodal series catalysts and the catalytic performance is demonstrated in detail in the following parts
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