Regeneration of Co3O4–CeO2 catalyst used for odor elimination in an offset-printing factory
- Kenichiro Inoue, Tokyo Metropolitan Industrial Technology Research Institute, Tokyo, Japan
- Shoichi Somekawa, Tokyo Metropolitan Industrial Technology Research Institute, Tokyo, Japan, Corresponding author; Email: email@example.com
- Tsutomu Shinoda, Sankyo Kousan Co., Ltd., 12-3, Kawasaki-city, Kanagawa, Japan
- Hiroyuki Fujiwara, Sankyo Kousan Co., Ltd., 12-3, Kawasaki-city, Kanagawa, Japan
- Yoshimasa Kawami, Sankyo Kousan Co., Ltd., 12-3, Kawasaki-city, Kanagawa, Japan
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 oC (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 oC; 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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