Process for removing nitrogen oxides from exhaust gases

Details Process for removing nitrogen oxides from exhaust gases Process for removing nitrogen oxides from exhaust gases

1989-06-12

1990-08-28

Shine, W. J.

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

Zeolite or clay, including gallium analogs

And group iii or rare earth metal or lanthanide containing

502 60, 502 74, B01J 2106, B01J 2322, B01J 2324, B01J 2904

Patent

active

049525450

ABSTRACT:
A process for removing nitrogen oxides from an exhaust gas containing the nitrogen oxides and an arsenic compound, which comprises bringing said exhaust gas into contact with a reducing gas in the presence of a catalyst to reduce the nitrogen oxides in the exhaust gas and render them nontoxic. There are disclosed two types of catalysts: (1) a catalyst comprising (A) an oxide of titanium, (B) an oxide of at least one metal selected from tungsten and molybdenum, (C) an oxide of vanadium, and (D) an oxide and/or a sulfate of at least one metal selected from the group consisting of yttrium, lanthanum, cerium and neodymium, and (2) the above (A), (B), (C) components and (D)' at least one metal selected from the group consisting of yttrium, lanthanum, cerium, neodymium, copper, cobalt, manganese and iron, the component (D)' being deposited on zeolite.

REFERENCES:
patent: 4081510 (1978-03-01), Kato et al.
patent: 4735927 (1988-04-01), Gerdes et al.

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