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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 21, Number 12
BKCSDE 21(12)
December 20, 2000 

A Study on the Sulfur-Resistant Catalysts for Water Gas Shift Reaction IV. Modification of CoMo/ γ-Al2O4 Catalyst with K
Jin-Nam Park, Jae-Hyun Kim, Ho-In Lee
The effect of K addition to the catalyst of CoMo/Υ-Al₂O₃ was studied. The catalyst with 10 at% of K to Mo atoms in 3C10M, the catalyst added 3 wt% CoO to 10 wt% MoO₃/Υ-Al₂O₃, 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 cluster such as Mo7O246- and the formation of small MoO42- 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 5K3C10M (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.
1239 - 1244
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