HEAT TREATED ACTIVATED CARBON FOR DENITRATION, PROCESS FOR PREPARING THE SAME, METHOD OF DENITRATION USING THE SAME, AND SYSTEM OF DENITRATION USING THE SAME

WIPO Patent Application WO/1997/012671

A1

The invention pertains to the techniques for removing nitrogen oxides (NOx) contained in the exhaust gas discharged from boilers or the like. When the exhaust gas temperature is 100 �C or below, preferred is a heat treated activated carbon prepared by heat-treating an activated carbon as the raw material in a nonoxidizing atmosphere at 600 to 1200 �C and removing the oxygen-containing functional groups present on the surface thereof to lower the atomic ratio of the surface oxygen to the surface carbon below 0.05. When the exhaust gas temperature exceeds 100 �C, preferred is a heat treated activated carbon prepared by heat-treating an activated carbon as the raw material in a nonoxidizing atmosphere at 600 to 1200 �C and activating the surface of the activated carbon with sulfuric or nitric acid to give rise to oxidizable oxygen-containing functional groups on the surface.

MOCHIDA ISAO (JP)
YASUTAKE AKINORI (JP)
SETOGUCHI TOSHIHIKO (JP)
KOBAYASHI NORIHISA (JP)
KASUH TAKAHIRO (JP)
YOSHIKAWA MASAAKI (JP)

PCT/JP1996/002737

April 10, 1997

September 24, 1996

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OSAKA GAS CO LTD (JP)
MITSUBISHI HEAVY IND LTD (JP)
MOCHIDA ISAO (JP)
YASUTAKE AKINORI (JP)
SETOGUCHI TOSHIHIKO (JP)
KOBAYASHI NORIHISA (JP)
KASUH TAKAHIRO (JP)
YOSHIKAWA MASAAKI (JP)

B01D53/86; B01J21/18; (IPC1-7): B01J21/18; B01D53/56; B01D53/86

JPH0679176A	1994-03-22
JPS5381475A	1978-07-18
JPS54139880A	1979-10-30
JPS6458331A	1989-03-06
JPH05261249A	1993-10-12

See also references of EP 0801978A4

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