Exhaust gas treating systems

Details Exhaust gas treating systems Exhaust gas treating systems

1998-12-24

2000-08-22

Griffin, Steven P.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

42324401, 423522, B01D 5360

Patent

active

061067911

ABSTRACT:
An active carbon for use in the treatment of exhaust gas can be obtained by heat-treating a starting active carbon fiber derived from polyacrylonitrile, pitch or the like or a starting particulate active carbon in a non-oxidizing atmosphere. The heat-treating temperature is preferably in the range of 600 to 1,200.degree. C. for use in the desulfurization of exhaust gas, and in range of 600 to 1,000.degree. C. for use in the denitration of exhaust gas. By using the resulting heat-treated active carbon for the purpose of desulfurization, the sulfur oxide concentration in exhaust gas can be reduced to 5 ppm or below. Moreover, by using the heat-treated active carbon in combination with conventional denitration based on selective catalytic reduction, the nitrogen oxide concentration in exhaust gas can be reduced to 1 ppm or below.

REFERENCES:
patent: 3639953 (1972-02-01), Kimura et al.
patent: 4210628 (1980-07-01), Ninomiya et al.
patent: 4500501 (1985-02-01), Hamada et al.
patent: 4921826 (1990-05-01), Juentgen
Patent Abstracts of Japan, vol. 003, No. 087 (C-053), Jul. 25, 1979 & JP 54 064091 A (TOHO Rayon Co. Ltd.), May 23, 1979.

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