Methanation of CO 2 in biogas could realize CO 2 utilization; meanwhile, the biogas is upgraded. In this study, a methanation catalyst was designed and the system efficiency considering a solid oxide electrolysis cell (SOEC) was evaluated. A layered nickel silicate catalyst was synthesized and modified by doping with trace amounts of precious metal Pt and alkaline-earth metal Mg. The conversion of CO 2 reached 79% with 100% selectivity toward CH 4 for model biogas with 50 vol % CO 2 and 50 vol % CH 4 over the Pt- and MgO-doped Ni/SiO 2 catalyst at 350 °C. A simulation system consisting of SOEC and methanation of simulated biogas is built with commercial software Aspen Plus. The energy efficiency was analyzed and optimized through a heat exchange network, which achieved about 30% increase in efficiency. The energy utilization efficiency can be greater than 86% when the CO 2 conversion in biogas is greater than 99% by adjusting the methanation temperature and H 2 /CO 2 ratio. The energy efficiency in direct methanation of biogas exceeds 8% higher than that in methanation of CO 2 separated from biogas.
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Zhang et al. (2022) studied this question.
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