Effects of Mo2C loading and H2S concentration on Mo2C/Al2O3 catalyst applied in sulfur‐resistant methanation
APPLIED ORGANOMETALLIC CHEMISTRY(2019)
摘要
Mo2C/Al2O3 catalyst was prepared by the impregnation method with urotropine and ammonium paramolybdate. The catalytic effect of Mo2C as a typical transition-metal carbide in sulfur-resistant methanation was studied. The catalysts prepared were characterized by N-2 adsorption-desorption, X-ray diffraction, transmission electron microscopy, H-2-temperature-programmed reduction, and Raman spectra, with the results confirming the formation of beta-molybdenum carbide on the surface of the catalysts. Studies on catalysts with different loading doses indicate that the optimal loading of Mo2C/Al2O3 is about 15 wt.%, which enables CO conversion rate of up to 47%, with methane selectivity of up to 53%. This work further explored the effect of different concentrations of H2S in the raw gas on the performance of the catalyst, with the results showing that high concentration of H2S (>1500 ppm) can lead to sulfuration of active species on the catalyst, while resulting in a decrease in the catalytic activity.
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关键词
H2S concentration,Mo2C loading,molybdenum carbide,sulfur-resistant methanation,synthetic natural gas
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