Catalyst for reducing nitrogen oxides and process for making the

Details Catalyst for reducing nitrogen oxides and process for making the Catalyst for reducing nitrogen oxides and process for making the

1990-05-18

1992-10-13

Shine, W. J.

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Silicon containing or process of making

502527, 502247, 502254, 502255, 423239A, B01J 2106, B01J 2108, B01J 2322, B01J 2328, B01J 2330

Patent

active

051550830

ABSTRACT:
A catalyst for reducing nitrogen oxides in the exhaust gas with ammonia, having a catalyst composition coated on an inorganic fiber cloth as a substrate is provided. The inorganic fiber cloth is impregnated with at least one inorganic oxide selected from silica and said catalyst composition, preferably with an organic binder like polyvinyl alcohol, so that the weight ratio of the inorganic oxide/said inorganic fiber cloth is in the range of 0.05 to 0.8 and the inorganic oxide is substantially placed between the fibers constituting said inorganic fiber cloth.
The above inorganic fiber cloth is preferably a glass fiber cloth, more preferably a glass fiber cloth which surface is acid-treated to have a layer deficient in alumina and calcium oxide.

REFERENCES:
patent: 3189563 (1965-06-01), Hamel
patent: 3929671 (1975-12-01), Nakamura et al.
patent: 4038214 (1977-07-01), Gotoh et al.
patent: 4280926 (1981-07-01), Abe et al.
patent: 4282115 (1981-08-01), Atsukawa et al.
patent: 4732879 (1988-03-01), Kalinowski et al.
Schleppy, R., Jr., "Reduction of Nitric Oxide on Fiber Glass", Ind. Eng. Chem, Prod. Res. Dev., vol. 15, No. 3, pp. 172-176.

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