ISSN 2630-0583 (Print)

ISSN 2630-0656 (Online)

JCST

Journal of Current Science and Technology

http://jcst.rsu.ac.th

Journal of Current Science and Technology. Vol.8 No.1 , January - June 2018.

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

Kenichiro Inoue, Shoichi Somekawa, Tsutomu Shinoda, Hiroyuki Fujiwara, and Yoshimasa Kawami

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.

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

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DOI: 10.14456/jcst.2018.6