Heat-treated active carbons for use in denitration,...

Details Heat-treated active carbons for use in denitration,... Heat-treated active carbons for use in denitration,...

2002-02-25

2008-12-16

Hendrickson, Stuart (Department: 1793)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Waste gas purifier

C422S169000, C422S170000

Reexamination Certificate

active

07465429

ABSTRACT:
This invention relates to a technique for removing nitrogen oxides (NOx) present in exhaust gases discharged from boilers and the like. When the temperature of the exhaust gas is 100° C. or below, a heat-treated active carbon produced by heat-treating a raw active carbon at 600 to 1,200° C. in a non-oxidizing atmosphere so as to remove oxygen-containing functional groups present at the surfaces thereof and thereby reduce the atomic surface oxygen/surface carbon ratio to 0.05 or less is preferably used. When the temperature of the exhaust gas exceeds 100° C., a heat-treated active carbon produced by heat-treating a raw active carbon at 600. to 1,200° C. in a non-oxidizing atmosphere and activating the surfaces thereof with sulfuric acid or nitric acid to impart oxidizing oxygen-containing functional groups thereto is preferably used.

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Matsumura, ‘The Effects of Hydrophilic Structures of Active Carbons on the Adsorption of Benzene and Methanol Vapors’ in Carbon vol. 23 No. 3 pp. 263-271.

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