Catalyst of supported vanadium oxide and manganese oxide and met

Details Catalyst of supported vanadium oxide and manganese oxide and met Catalyst of supported vanadium oxide and manganese oxide and met

1974-06-03

1977-01-18

Shine, W. J.

Compositions

X-ray or neutron shield

252461, 423239, B01J 2322, B01J 2334

Patent

active

040038548

ABSTRACT:
The catalyst for selective removal of nitrogen oxides from waste gases is actually vanadium oxide and manganese oxide applied to an inert carrier. Said metal oxides are taken in the weight ratio V.sub.2 O.sub.5 /Mn.sub.2 O.sub.3 of 0.1 - 30:1, the total weight of the metal oxides being 5 - 40 per cent of the total weight of the catalyst.
The proposed catalyst is prepared by dissolving ammonium metavanadate or vanadium pentoxide in an aqueous solution of oxalic acid having a concentration of 10 to 360 g/liter. A hydro-soluble salt of manganese is then dissolved in the obtained solution of ammonium oxalate-vanadate or oxalate-vanadic acid, the manganese salt being taken in such a quantity that the weight ratio of ammonium oxalate-vanadium or oxalate-vanadic acid to the manganese salt should be from 0.1 to 30:1 calculating with reference to the ratio of the metal oxides V.sub.2 O.sub.5 /Mn.sub.2 O.sub.3. The thus-prepared solution is used to impregnate an inert carrier, which is then dried at a temperature of 110.degree. - 120.degree. C, and calcined at a temperature from 400.degree. to 600.degree. C. Said operations of impregnating, drying, and calcining are performed at least once.

REFERENCES:
patent: 2134543 (1938-10-01), Andrews
patent: 3025132 (1962-03-01), Innes
patent: 3200144 (1965-08-01), Baumgartner et al.
patent: 3656915 (1972-04-01), Tourtellotte
patent: 3699683 (1972-10-01), Tourtellotte et al.

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