Regeneration of Co3O4-CeO2 catalyst used for odor elimination in an offset printing factory

Kenichiro  Inoue; Shoichi  Somekawa; Tsutomu Shinoda; Hiroyuki  Fujiwara; Yoshimasa  Kawami

Authors

Kenichiro Inoue Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10, Aomi, Koto-ku, Tokyo 135-0064, Japan
Shoichi Somekawa Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10, Aomi, Koto-ku, Tokyo 135-0064, Japan
Tsutomu Shinoda Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10, Aomi, Koto-ku, Tokyo 135-0064, Japan
Hiroyuki Fujiwara Sankyo Kousan Co., Ltd., 12-3, Ogi-machi, Kawasaki-ku, Kawasaki-city, Kanagawa 210-0867, Japan
Yoshimasa Kawami Sankyo Kousan Co., Ltd., 12-3, Ogi-machi, Kawasaki-ku, Kawasaki-city, Kanagawa 210-0867, Japan

Keywords:

Co3O4-CeO2 catalyst, offset printing factory, Pt/Al2O3 catalyst, odor elimination, recovery of catalyst activity, sulfur

Abstract

Deactivated ball-type Co₃O₄-CeO₂ catalyst used for odor elimination in an offset printing factory for a year was regenerated by soaking in water. The reaction yield of ethyl acetate to carbon dioxide increased, on regeneration, to 98% from 82% (used catalyst) at 350^○C (new catalyst: almost 100%). Sulfur was found in the water (eluate) after soaking the deactivated catalyst; and it is suggested that sulfur, which generally works as a catalyst poison, is dissolved in the water, resulting in recovery of catalyst activity. In the case of ball-type Pt/Al₂O₃ catalyst, little catalyst deactivation was observed after a year of usage at 350^○C; and it is considered that, in this case, the blocking of active sites is suppressed, since the sulfur adsorbed on platinum is easily burned and converted into gas.

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