Methanation of Carbon Dioxide on Co-Containing Aluminosilicate Catalysts

Results of the study of CO₂ methanation on Co-containing catalysts based on Siral aluminosilicates with different SiO₂/Al₂O₃ ratios (1, 10, and 40) are presented. It is shown that methane is the main product at temperatures up to 573 K, its yield varies depending on the SiO₂/Al₂O₃ ratio of aluminosilicate. Carbon monoxide is formed along with methane at temperatures above 573 K. Maximum methane yields of 55% and 41% (at 573 K) are achieved on Co/Siral-1 and Co/Siral-10 catalysts. It is shown that catalysts reduced in a hydrogen flow are characterized by the presence of superpara/ferromagnetic particles and magnetic resonance parameters of their EMR spectra significantly depends on the SiO₂/Al₂O₃ ratio of the aluminosilicate. It is assumed that the superpara/ferromagnetic particles formed during high-temperature hydrogen treatment of Co-containing aluminosilicates are catalytically active particles in the methanation of carbon dioxide.