Retest Parameters for Single-Cobalt-Based-Catalysts for Dry Reforming of Methane

Abstract

Cobalt-based catalysts are promising and yet to be thoroughly explored candidates for Dry reforming of methane (DRM). In this paper, we retested the crucial parameters including supports, cobalt loadings, and calcination temperatures for single cobalt-metal-based catalysts for DRM. X-ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS), CO₂ programmed desorption (CO₂-TPD), thermogravimetric analysis (TG) and scanning electron microscope (SEM) experiments were applied to characterize the textural properties, cobalt species distribution and coke resist performance. Analysis of the physical/chemical properties in relation to the performance implies that suitable amounts of Co³⁺ species, oxygen vacancies, and particle size are crucial factors for the optimization of Co-based DRM catalysts. The optimized catalyst 8Co/MgAl₂O₄(600) with MgAl₂O₄ support, 8 wt% Co and 600°C calcination temperature gave a coke deposition of 15.02% and 66% and 75% conversions of CH₄ and CO₂, respectively, with H₂/CO ratios stabilized at ca. 0.83 after 30 h of operation at 700°C.