Bulletin of the Korean Chemical Society

  • 제21권12호
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  • Pages.1239-1244
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  • 2000
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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A Study on the Sulfur-Resistant Catalysts for Water Gas Shift Reaction IV. Modification of $CoMo/γ-Al_2O_3$ Catalyst with K

  • 발행 : 20001200
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초록

A study of K addition to the catalyst of CoMo/ ${\gamma}-Al_2O_3$ was studied. The catalyst with 10 at% of K to Mo atoms in 3C10M, the catalyst added 3 wt% CoO to 10 wt% $MoO_3/{\gamma}-Al_2O_3$, showed the highest activity for water gas shift reaction. The addition of K retarded the reducibility of cobalt-molybdenum catalysts. It gave, however, good dispersion and large BET surface area to the catalysts which were attributed to the disappearance of polymolybdate clustyer such as $Mo_7O_{24}^{6-}$ and the formation of small Mo$O_4^{2-}$ cluster. It was confirmed by the analyses of pore size distribution, activation energy, Raman spectroscopy, and electron diffraction. The activation energies and the frequency factors of the catalysts 3C10M and 5KC10M (the catalyst added 5 at% K for Mo to the catalyst 3C10M) were 43.1 and 47.8 kJ/mole, and 4,297 and 13,505 $sec^{-1}$, respectively. These values were also well correlated with our suggestion. These phenomena were attributed to the direct interaction between K and CoMo oxides irrelevant to the support.

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참고문헌

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피인용 문헌

  1. The state of (K)(Ni)Mo/γ-Al2O3 catalysts after water–gas shift reaction in the presence of sulfur in the feed: XPS and EPR study vol.297, pp.2, 2000, https://doi.org/10.1016/j.apcata.2005.08.043
  2. Preparation of silica- and carbon-supported cobalt by electrostatic adsorption of Co(III) hexaammines vol.248, pp.2, 2000, https://doi.org/10.1016/j.jcat.2007.03.010
  3. Hydrogen Production by Water Gas Shift Reaction Over Pd-K Impregnated Co Oxide Catalyst vol.143, pp.4, 2000, https://doi.org/10.1007/s10562-013-0974-x