Influence of Mg‐promoted Ni‐based Catalyst Supported on Coconut Shell Carbon for CO2 Methanation

Abstract

AbstractThis study aims to investigate the conversion of CO2 and H2 into CH4 under atmospheric pressure. A series of nickel‐based catalysts using coconut shell carbon were prepared by co‐impregnation method, and the coconut shell carbon carrier in the CO2 methanation demonstrated its advantage by comparison with the alumina and zirconia supports. Magnesium modified Ni/coconut shell carbon catalysts were studied to explore the catalytic performances, the morphology and properties of all catalysts were characterized by CO2‐TPD, XRD, SEM, BET, FTIR, TEM and H2‐TPR. Catalytic performances were experimentally evaluated in a fixed bed tubular reactor under atmospheric pressure, WHSV of 10,000 mlh−1g−1, and H2/CO2 molar ratio of 4/1. Experimental results indicated magnesium modified Ni‐Mg0.26/coconut shell carbon catalyst has outstanding activity and excellent stability, which performed the highest CO2 conversion (90.10%) and CH4 selectivity (99.22%) at 450 °C. The catalytic activity of Ni‐Mg0.26/ coconut shell carbon experienced 50 h stability evaluation, and no evident decrease was found during the methanation process.