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Method of treating combustion exhaust gas containing nitrogen oxides

Patent ·
OSTI ID:6379052
; ; ;
A method of treating a combustion exhaust gas containing nitrogen oxides comprises: a first step of removing nitrogen oxides by treating a mixture of the exhaust gas, oxygen and ammonia in the absence of hydrogen or in the presence of lower than 10 mole ratio of hydrogen to ammonia at a temperature from 700 to 1300/sup 0/C, and a second step of adjusting a mole ratio of hydrogen to ammonia in the pretreated exhaust gas to higher than 3 and treating the mixed gas at a temperature from 490 to 700/sup 0/C.
Assignee:
Mitsubishi Chemical Industries, Ltd.
Patent Number(s):
US 4113838
OSTI ID:
6379052
Country of Publication:
United States
Language:
English

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Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701* -- Emission Control-- Nitrogen Oxides
AIR POLLUTION CONTROL
AMMONIA
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DENITRIFICATION
DESIGN
ELEMENTS
ENGINES
EXHAUST GASES
FLUIDS
GASEOUS WASTES
HIGH TEMPERATURE
HYDRIDES
HYDROGEN
HYDROGEN COMPOUNDS
INTERNAL COMBUSTION ENGINES
MANAGEMENT
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POLLUTION CONTROL
PROCESSING
WASTE MANAGEMENT
WASTE PROCESSING
WASTES