Reduction catalyst for removal of nitrogen oxides in exhaust gas

Details Reduction catalyst for removal of nitrogen oxides in exhaust gas Reduction catalyst for removal of nitrogen oxides in exhaust gas

1976-03-04

1978-06-27

Peters, G. O.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

252454, 252455Z, B01D 5334

Patent

active

040975762

ABSTRACT:
A reduction catalyst is disclosed. This catalyst comprises a naturally-occurring inorganic material which is a tuff consisting essentially of SiO.sub.2, Al.sub.2 O.sub.3 and H.sub.2 O containing 1-10% by weight of an alkali metal oxide and an alkaline earth metal oxide and has an X-ray diffraction pattern as shown in Table A or Table B. It is produced by depositing of the tuff metal ions selected from the group consisting of a metal belonging to Ib Group, IIb Group and VIII Group of Periodic Table, chromium, vanadium and manganese, followed by heat treatment, and repeating the same using different metal ions on each occasion. The catalyst is useful as a reduction catalyst for nitrogen oxides.

REFERENCES:
patent: 3346328 (1967-10-01), Sergeys et al.
patent: 3436356 (1969-04-01), Kato et al.
patent: 3449063 (1969-06-01), Griffing et al.
patent: 3476508 (1969-11-01), Kearby et al.
patent: 3656915 (1972-04-01), Tourtellotte
patent: 3873469 (1975-03-01), Foster
patent: 4013588 (1977-03-01), Tamura

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