Utilization of coal gasification fine slag-derived mesoporous silica supports for enhanced dry reforming of methane catalysts

Abstract

Utilizing industrial waste coal gasification fine slag (CGFS) for the preparation of dry reforming of methane (DRM) catalyst supports presents an innovative approach to waste utilization. This strategy not only addresses solid waste pollution but also reduces the production costs associated with DRM catalysts. Currently, the industrialization of the DRM reaction remains elusive. Therefore, selecting an appropriate catalyst preparation method is imperative for potential industrial applications. This study centers on the synthesis of mesoporous silica (MS) supports using coal gasification fine slag. The impact of support structure, catalyst preparation method, and active metal loading on the resistance to sintering and carbon deposition of the catalysts is explored through diverse characterization techniques. The MS support derived from coal gasification fine slag showcases a unique disordered mesoporous architecture that enhances the dispersion of the metal across the support surface. In addition, we report a MS catalyst prepared by a co-precipitation method (MS–CP), which exhibits excellent catalytic activity and stability due to its strong metal-support interaction. Results suggest that during synthesis, the MS–CP catalyst activates the inert MS support by strongly interacting with Ni metal, resulting in the formation of Ni3Si2O5(OH)4 species. The Ni–O–Si bond can activate CO2, thereby promoting the availability of interfacial oxygen during the reaction. This process accelerates the gasification of surface Cn generated by CH4 decomposition. Notably, the loading analysis indicates that MS–CP loaded with 10 wt% Ni demonstrates the highest resistance to carbon deposition and sintering. Thus, the unique strong metal-supported interactions provide a new avenue for the development of nickel-based DRM catalysts.