Abstract
The highly ordered mesoporous structures of Co3O4-Al2O3 mixed metal oxide, prepared by using a hard template of the mesoporous KIT-6, revealed a higher catalytic activity and stability for CO2 hydrogenation to synthetic methane at an optimal surface Al content with ∼6 wt% (m-CoAl(1)). The higher CO2 conversion (42.5%) and CH4 selectivity (96.7%) were attributed to the adjusted surface hydrophobicity with optimal amount of spinel CoAl2O4 phases, where the CoAl2O4 phases mainly acted as structural stabilizing components in the ordered mesoporous Co3O4-Al2O3 matrices by suppressing the aggregations of Co3O4 nanoparticles as well as by generating more hydrophobic surfaces. At an optimal surface Al2O3 content (m-CoAl(1)), the stronger interactions of Co3O4-Al2O3 were selectively formed with the help of an optimal amount of the spinel CoAl2O4 phases, which further enhanced the surface hydrophobicity and oxygen vacant sites to effectively suppress competitive adsorption of water formed by CO2 hydrogenation.
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