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US 5,472,676 AGranted
Method of deodorizing a gas containing maloderous components
AssigneeNippon Shokubai Co., Ltd.
InventorsSadao Terui, Kunio Sano, Kazuyoshi Nishikawa, Akira Inoue, Yoshiyuki Yokota
Life of this patent
Estimating the term…
Abstract
A gas containing malodorous components is deodorized by passing the gas over a MnO.sub.2 based catalyst while the catalyst is heated by directly applying an electric current thereto, thereby catalytically oxidizing the malodorous components in the gas and effecting their removal.
Claims10
A method of decomposing ozone, which comprises the steps of:
- contacting an ozone-containing gas with a catalyst of (a) MnO.sub.2 or (b) MnO.sub.2 combined with at least one element selected from the group consisting of Fe, Co, Ni, Cu, Ag, Au, Pt, Pd and Rh, either of which catalysts (a) or (b) is supported on an inorganic support, said catalyst being integrally molded and being directly heated by an applied electric current;
- and
- decomposing the ozone in said gas.
A method of decomposing absorbable gas components of a gas by absorption-combustion, comprising the steps of:
- (a) flowing a gas containing absorbable gas components over
- (1) a first catalyst,
- (2) an absorbent, and
- (3) a second catalyst, in sequential order, said first and second catalyst being integrally molded MnO.sub.2 or integrally MnO.sub.2 combined with at least one element selected from the group consisting of Fe, Co, Ni, Cu, Ag, Au, Pt, Pd and Rh, thereby sorbing absorbable gas components from the gas;
- (b) directly heating the first and second catalyst and absorbent by applying an electric current to the first and second catalyst thereby desorbing absorbable gas components and bringing the desorbed gas components in contact with the first and second catalyst and decomposing the gas components;
- and
- (c) interrupting the heating of the first and second catalyst after all of said gas components have been decomposed by combustion and returning to step (a).
4 more elements
A method of decomposing absorbable gas components of a gas on a catalyst-sorbent, comprising the steps of:
- flowing said gas containing absorbable gas components in an upward direction through an integrally molded MnO.sub.2 on a support or a catalyst-sorbent or integrally molded MnO.sub.2 with at least one element selected from the group consisting of Fe, Co, Ni, Cu, Ag, Au, Pt, Pd and Rh, on an inorganic support, thereby absorbing said absorbable gas components;
- desorbing the absorbed gas components by heating, which desorption is accompanied by reduction of the flow of gas through the catalyst;
- and
- decomposing the absorbed gas components by directly heating the catalyst by applied electric current until all desorbed gas components are decomposed thereby discharging gas to the environment free of unburnt gas components.
1 more element
Dependencies are inferred from the claim text.