Catalyst for removing nitrogen oxides

Details Catalyst for removing nitrogen oxides Catalyst for removing nitrogen oxides

1988-10-18

1990-08-28

Shine, W. J.

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

Catalyst or precursor therefor

Sulfur or compound containing same

502309, 423239, B01J 2106, B01J 2322, B01J 2328, B01J 2330

Patent

active

049525484

ABSTRACT:
A catalyst for removing nitrogen oxides contained in exhaust gases, particularly those containing vapor-form catalyst poisons, by catalytic reduction with ammonia, while retaining a high denitration performance for a long time, which catalyst comprises titanium oxide as a first component, molybdenum oxide and/or tungsten oxide as a second component and vanadium oxide and/or sulfate as a third component, the atomic ratio of the respective elements being Ti:Mo and/or W:V=80-96.6:3-15:0.5-5, and the size of the crystallite of the titanium oxide according to Sherrer's equation being in the range of 185 .ANG. to 300 .ANG. in the direction of a plane (101) (interplanar spacing: d=3.52 .ANG.).

REFERENCES:
patent: 3614809 (1971-10-01), Hayes et al.
patent: 3632709 (1972-01-01), Hayes et al.
patent: 4085193 (1978-04-01), Nakajima et al.
patent: 4466947 (1984-08-01), Imanari et al.

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