Positive Effects of CeO₂ Promoter and Co-Reactant/CO on Methanation of CO₂-Rich Gas over Ni/SBA-15 Catalyst

Abstract

NiO/SBA-15 catalysts modified by CeO₂ were synthesized and studied for the hydrogenation of CO₂-rich gas. Effect of CeO₂ promoter on the physicochemical properties of the catalysts was investigated by BET, XRD, Raman spectroscopy, SEM, TEM, H₂-TPR and CO₂-TPD methods. The 4 mass% CeO₂ addition improved reduction and dispersion of Ni, resulting in its higher activity in methanation, reaching CO₂ conversion of 90% at 350°C. Furthermore, the performance of the prepared catalysts in methanation reaction was enhanced by adding small amount of CO (1 mol%) in the feedstock.

Fig. 11 CO₂ conversion in methanation of mixture of 19 mol% CO₂ with 1 mol% CO (case I - dashed lines) and with 1 mol% N₂ (case II - solid lines) on Ni4Ce/SBA catalyst.