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Effects of Mo 2 C loading and H 2 S concentration on Mo 2 C/Al 2 O 3 catalyst applied in sulfur‐resistant methanation
Author(s) -
Wang Baowei,
Wang Chengyu,
Yu Wenxian
Publication year - 2019
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.5208
Subject(s) - catalysis , chemistry , methanation , transition metal , molybdenum , selectivity , carbide , inorganic chemistry , desorption , raman spectroscopy , adsorption , nuclear chemistry , analytical chemistry (journal) , organic chemistry , physics , optics
Mo 2 C/Al 2 O 3 catalyst was prepared by the impregnation method with urotropine and ammonium paramolybdate. The catalytic effect of Mo 2 C 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 β‐molybdenum carbide on the surface of the catalysts. Studies on catalysts with different loading doses indicate that the optimal loading of Mo 2 C/Al 2 O 3 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 H 2 S in the raw gas on the performance of the catalyst, with the results showing that high concentration of H 2 S (>1500 ppm) can lead to sulfuration of active species on the catalyst, while resulting in a decrease in the catalytic activity.