Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Reexamination Certificate
2008-11-14
2010-02-02
Hendrickson, Stuart (Department: 1793)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
Reexamination Certificate
active
07655204
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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Kasuh Takahiro
Kobayashi Norihisa
Mochida Isao
Setoguchi Toshihiko
Yasutake Akinori
Foley & Lardner LLP
Hendrickson Stuart
Mitsubishi Jukogyo Kabushiki Kaisha
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