Reduction of NO with NH/sub 3/ on TiO/sub 2/-,Al/sub 2/O/sub 3/- and Fe/sub 2/O/sub 3/-supported metal oxide catalysts
The pollution of the atmosphere by nitrogen oxides (NO/sub x/=NO+NO/sub 2/) has been a subject of growing concern during the past decade. During combustion, NO/sub x/ is formed either by reaction of oxygen and atmospheric nitrogen (thermal NO/sub x/) or conversion of chemically bound nitrogen in the fuel (fuel-NO/sub x/). The major fraction of these emissions results from the fuel-NO/sub x/ during combustion in industrial and utility boilers. The formation of NO/sub x/ in the boilers can be reduced to a considerable extent by modification in the combustion technique, for example by applying fluidized bed combustion boilers. There still will remain some NO/sub x/ in the flue gases. Hence, other additional methods have been introduced for NO/sub x/-removal. The most widely applied method for decreasing NO/sub x/ emissions from existing stationary sources is selective catalytic reduction (SCR) by NH/sub 3/. The most commonly proposed overall reactions between NO and NH/sub 3/ are: 4 NH/sub 3/ + 4 NO + O/sub 2/ ----> 4 N/sub 2/ + 6 H/sub 2/O (1) 4 NH/sub 3/ + 6 NO ----> 5 N/sub 2/ + 6 H/sub 2/O (2). The catalyst used in a commercial plant must possess high activity and selectivity, since the volume of flue gas to be treated is large. In addition, the catalyst must be resistant to SO/sub x/ poisoning. The purpose of the present study was to examine the kinetics of NO-NH/sub 3/-O/sub 2/ reactions on several catalysts promoting the SCR of NO/sub x/.
- Research Organization:
- A. Ahlstroem Co., Karhula (Finland)
- OSTI ID:
- 5931276
- Report Number(s):
- CONF-8708275-
- Journal Information:
- Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Journal Name: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States) Vol. 32:4; ISSN ACFPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010800* -- Coal
Lignite
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ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMMONIA
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COPPER COMPOUNDS
COPPER OXIDES
DATA
ELEMENTS
EXPERIMENTAL DATA
FLUE GAS
GASEOUS WASTES
HEMATITE
HYDRIDES
HYDROGEN COMPOUNDS
ILMENITE
INFORMATION
IRON COMPOUNDS
IRON ORES
IRON OXIDES
KINETICS
MINERALS
NICKEL COMPOUNDS
NICKEL OXIDES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
NUMERICAL DATA
ORES
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
REDUCTION
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES
WASTES