Reduction of nitrogen oxide in effluent gases using NCO radicals
A process is described for reducing the nitrogen oxide content of a post combustion gas which comprises the steps of (a) generating NCO free radicals by (a-1) heating cyanuric acid in the presence of a catalyst which comprises zirconium, phosphorus or a mixture of zirconium and phosphorus at a temperature of less than 1,000 F, (a-2) reacting formaldehyde with nitrogen in the presence of a catalyst capable of promoting the reaction, (a-3) reacting formaldehyde with nitric oxide, (a-4) reacting carbon monoxide with nitric oxide, nitrogen or a mixture thereof, (a-5) reacting of methanol with nitrogen, or (a-6) combinations of any one of (a-l) - (a-5), and thereafter (b) adding the free radicals to the gas whereby the NCO free radicals react with the nitrogen oxide in the gas at a temperature of from ambient temperature up to about 2,000 F.
- Assignee:
- Molecular Technology Corp., Canton, OH (United States)
- Patent Number(s):
- US 5234670; A
- Application Number:
- PPN: US 7-668045
- OSTI ID:
- 6034535
- Country of Publication:
- United States
- Language:
- English
Similar Records
Catalytic decomposition of cyanuric acid and use of product to reduce nitrogen oxide emission
Kinetics of the reaction of NCO with ethene and oxygen over the temperature range 295-662K. [NCO]
Related Subjects
010800 -- Coal
Lignite
& Peat-- Waste Management
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
ALCOHOLS
ALDEHYDES
AZINES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
CYANURATES
DENITRIFICATION
ELEMENTS
FLUE GAS
FORMALDEHYDE
GASEOUS WASTES
HEATING
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
METALS
METHANOL
NITRIC OXIDE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS
POLLUTION CONTROL
RADICALS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TRANSITION ELEMENTS
TRIAZINES
WASTES
ZIRCONIUM