期刊
PROCESSES
卷 9, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/pr9111899
关键词
CO2 methanation; in operando DRIFT; reaction mechanism; CeO2 morphology; nickel catalyst
Nickel-cerium oxide catalysts with nanorod morphology showed excellent performance in methanation reaction, achieving a CO2 conversion of 40% with a high CH4 selectivity of 93%.
The valorization of CO2 via renewable energy sources allows one to obtain carbon-neutral fuels through its hydrogenation, like methane. In this study, Ni0.05Ce0.95O2-delta catalysts were prepared using a simple one-pot hydrothermal method yielding nanorod and nanocube particles to be used for the methanation reaction. Samples were characterized by XRD, BET, TEM, H-2-TPR, and H-2-TPD experiments. The catalytic activity tests revealed that the best performing catalyst was Ni0.05Ce0.95O2-delta, with nanorod morphology, which gave a CO2 conversion of 40% with a selectivity of CH4 as high as 93%, operating at 325 & DEG;C and a GHSV of 240,000 cm(3) h(-1) g(-1). However, the lower activation energy was found for Ni0.05Ce0.95O2-delta catalysts with nanocube morphology. Furthermore, an in operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis was performed flowing CO2:H-2 or CO:H-2 mixture, showing that the main reaction pathway, for the CO2 methanation, is the direct hydrogenation of formate intermediate.
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