Catalytic reduction of NO/sub x/ in stack gases
- Hitachi Research Lab., Ibaraki-ken, Japan
It is of vital importance to develop a high performance catalyst for the commercial utilization of a NO/sub x/ reduction plant. There are several requirements for the catalyst: it must have a high activity and selectivity for the NO/sub x/--NH/sub 3/ reaction; it must be resistant to SO/sub x/ poisoning for stable and reliable operation of an NO/sub x/ reduction plant. A life list of the catalyst was carried out using a bench-scale test plant, which treated a flue gas from a residiuum oil-fired boiler. A mechanism for the NO--NH/sub 3/ reaction was investigated using the NR-catalysts. The NO conversion as a function of the NO/NH/sub 3/ ratio was studied using NR-600 catalyst. The effect of oxygen in the NO--NH/sub 3/ reaction was studied using a gas mixture with or without O/sub 2/. Based on the experience of many pilot plants, Hitachi Ltd. has constructed about 10 commercial NO/sub x/ reduction plants. A plant treating a flue gas from a coke oven plant at a gas flow rate of 500,000 Nm/sup 3//h has been operated for about 2 years. The largest plant treated a flue gas from a LNG-fired boiler at a gas flow rate of 2,000,000 Nm/sup 3//h. Several plants treating a petroleum-fired boiler flue gas have been operated successfully. A small plant, which treated a NO/sub 2/-containing gas at 210/sup 0/C, was operated very stably. 9 figures, 3 tables.
- OSTI ID:
- 6146323
- Report Number(s):
- CONF-790415-P4
- Journal Information:
- Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States), Journal Name: Prepr., Div. Pet. Chem., Am. Chem. Soc.; (United States) Vol. 24:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Innovative Clean Coal Technology (ICCT): Demonstration of selective catalytic reduction (SCR) technology for the control of nitrogen oxide (NO{sub x}) emissions from high-sulfur coal-fired boilers. Technical progress report, October 1993--December 1993
Related Subjects
010800 -- Coal
Lignite
& Peat-- Waste Management
02 PETROLEUM
020800* -- Petroleum-- Waste Management
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105 -- Separation Procedures
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACTIVATION ENERGY
AMMONIA
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
COKE
CRYOGENIC FLUIDS
DENITRIFICATION
ELEMENTS
ENERGY
ENERGY SOURCES
FLUE GAS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
FUNCTIONAL MODELS
GAS FUELS
GASEOUS WASTES
GASES
HYDRIDES
HYDROGEN COMPOUNDS
LIQUEFIED NATURAL GAS
MANAGEMENT
NATURAL GAS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PILOT PLANTS
REDUCTION
REMOVAL
STACK DISPOSAL
SULFUR COMPOUNDS
SULFUR OXIDES
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES