Effect of metal loading and Ce addition on biochar-supported Co catalysts for CO₂ methanation

Abstract

CO₂ hydrogenation to methane is an interesting topic that can result in CO₂ mitigation, providing a solution for global warming. Using a sustainable catalyst in that process will be considered as a plus point that makes the whole system (material + application) an eco-friendly process. Therefore, scientists have focused on the biochar-supported catalysts used in the CO₂ methanation. The use of cobalt (Co) catalysts supported on sugarcane bagasse biochar (SCBB) has not been investigated for the methanation of CO₂. Therefore, this work investigated the Co/SCBB systems in the CO₂ methanation with different Co loadings starting from 0.1 to 0.8 mmol_Co-salt/g_SCB. In addition, the effect of Ce was studied, proving that Ce addition improved the catalytic activity significantly, as the catalyst 0.5Co-0.25Ce/SCBB showed the foremost conversion of CO₂ (60% at 500 °C) and the best selectivity of methane (80% at 430 °C). This research lays the foundation for utilizing Ce to enhance the catalytic properties of various transition metals that can not offer high catalytic activity alone in the carbon dioxide methanation.

Graphical Abstract

Keywords

Cobalt-based catalysts / Hydrogenation / Methanation / Biochar / Methane / CO₂ / Chemical Sciences / Physical Chemistry (incl. Structural)

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Funding

ARG01-0530-230416(ARG01-0530-230416)

Qatar University

RIGHTS & PERMISSIONS

The Author(s)