Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1980-05-21
1981-11-24
Peters, G. O.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
422171, 422172, B01D 5336
Patent
active
043024319
ABSTRACT:
In a process and an apparatus for controlling oxides of nitrogen in exhaust gases from combustion equipment by decomposing the oxides, in the presence of oxygen, with ammonia blown into the equipment and associated ducting at temperatures within the range from 700.degree. to 1300.degree. C., a catalyst assembly is arranged, with the catalytic surfaces of the component units substantially in parallel to the direction of exhaust gas flow, in a region where the temperature of the gas after the decomposing treatment is between 300.degree. and 500.degree. C., and the gas after the decomposing treatment is caused to pass through the catalyst assembly to decompose residual nitrogen oxides and ammonia in the gas to innocuous substances. An additional supply of ammonia, in an amount from 0.5 to 1.5 times equivalent (in molar ratio) to the amount of nitrogen oxides in moles in the gas is introduced into the space immediately upstream of the catalyst assembly, thereby to accelerate the decomposition of the oxides in the gas to make it harmless.
REFERENCES:
patent: 3970739 (1976-07-01), Shiraishi et al.
patent: 4081510 (1978-03-01), Kato et al.
patent: 4102980 (1978-07-01), Sasaki et al.
patent: 4129651 (1978-12-01), Kolke et al.
patent: 4193972 (1980-03-01), Pohlenz
Atsukawa Masumi
Matsumoto Kazuhiro
Sera Toshikuni
Seto Toru
Ukawa Naohiko
Mitsubishi Jukogyo Kabushiki Kaisha
Peters G. O.
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