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Alcohol synthesis by catalytic hydrogenation of CO 2 over Rh–Co/SiO 2
Author(s) -
Kusama Hitoshi,
Okabe Kiyomi,
Sayama Kazuhiro,
Arakawa Hironori
Publication year - 2000
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 - 10.1002/1099-0739(200012)14:12<836::aid-aoc97>3.0.co;2-c
Subject(s) - catalysis , chemistry , rhodium , methanol , cobalt , selectivity , x ray photoelectron spectroscopy , reactivity (psychology) , yield (engineering) , inorganic chemistry , nuclear chemistry , organic chemistry , chemical engineering , metallurgy , materials science , medicine , alternative medicine , pathology , engineering
The effect of the cobalt additive on Rh/SiO 2 catalysts prepared by co‐impregnation was examined to improve the reactivity in CO 2 hydrogenation. The CO 2 conversion increased significantly with the amount of cobalt added. Although the methanol selectivity was very low over nonpromoted Rh/SiO 2 catalyst, more than 10% selectivity to methanol was obtained over the catalysts with cobalt added in the range of Co/Rh = 0.1–1 (atomic ratio). The methanol yield over Rh–Co/SiO 2 catalyst was higher than the sum of the yields of Rh/SiO 2 and Co/SiO 2 catalysts. Physically mixed Rh/SiO 2 and Co/SiO 2 catalysts did not promote methanol formation. Based on the results of X‐ray diffraction and X‐ray photoelectron spectroscopy, it was suggested that Rh–Co alloy was formed on the catalyst surface to change the electronic states of rhodium, resulting in promotion of methanol formation. Copyright © 2000 John Wiley & Sons, Ltd.