首页|Enhancement of magnesium aluminate-based nickel and cobalt nanostructured catalysts with iron for improved performance in carbon dioxide methanation
Enhancement of magnesium aluminate-based nickel and cobalt nanostructured catalysts with iron for improved performance in carbon dioxide methanation
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This study investigates the performance of Ni and Co catalysts based on Fe-promoted MgAl2O4 for CO2 metha-nation,which is a crucial step in mitigating environmental carbon dioxide levels.The MgAl2O4 support was modified with various Fe loading(5,10,and 15 wt％)and fabricated via a novel coprecipitation technique with the help of ultrasonic waves and chosen as support for 15 wt％Ni and Co active phases.Examination of the BET surface properties of the catalysts showed an increase in surface area in the range of 54-82 m2/g and 73-85 m2/g with an increasing Fe loading for Ni and Co catalysts,respectively.Among the Ni-based catalysts,the 15Ni/10FeMgAl2O4 specimen exhibited the best performance(with a 73.31％CO2 conversion and 95.61％selectivity rate)and remarkable lifetime during 10 h at 400 ℃ due to the better reducibility and the increase in hydrogen consumption.However,a rise in Fe amount to 15 wt％led to a reduction in the CO2 conversion to 34.43％.The catalytic outcomes also demonstrated that the presence of Fe in Co/MgAl2O4 catalysts negatively affects catalytic performance.The unpromoted Co/MgAl2O4 sample demonstrated the best performance,achieving a conversion rate of 52.41％at 350 ℃.
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