Effects of Mo2C loading and H2S concentration on Mo2C/Al2O3 catalyst applied in sulfur-resistant methanation

Article abstract of DOI:10.1002/aoc.5208

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 N₂ adsorption–desorption, X-ray diffraction, transmission electron microscopy, H₂-temperature-programmed reduction, and Raman spectra, with the results confirming the formation of β-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.