Preparation of a catalyst for the oxidation of sulfur dioxide to

Details Preparation of a catalyst for the oxidation of sulfur dioxide to Preparation of a catalyst for the oxidation of sulfur dioxide to

1984-06-25

1985-09-03

Gantz, D. E.

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

Catalyst or precursor therefor

Silicon containing or process of making

502243, 502312, 502344, 502353, 423535, B01J 2304, B01J 2322

Patent

active

045393095

ABSTRACT:
Catalysts for the oxidation of sulfur dioxide to sulfur trioxide, consisting of a silica-based carrier and, applied on this, an active substance containing vanadium and alkali metal compounds, are prepared by dissolving vanadium pentoxide in an alkali solution, acidifying the solution with sulfuric acid, mixing the acidified solution with the carrier, molding the mixture and drying and calcining the molding. To obtain mechanically stable catalysts, a dissolved alkali metal silicate and/or silica sol are added to the alkaline solution before acidification, the latter process is carried out at below 35.degree. C. and the solution is then immediately incorporated into the carrier. The resulting moist crumbly material contains from 2 to 6% by weight of V.sub.2 O.sub.5, from 35 to 45% by weight of H.sub.2 O and from 15 to 50% by weight of SiO.sub.2. From 5 to 25% by weight of the total silica content originates from the dissolved alkali metal silicate and/or silica sol.

REFERENCES:
patent: 3107223 (1963-10-01), Royer et al.
patent: 3186794 (1965-06-01), Davies
patent: 3275406 (1966-09-01), Krempff
patent: 3755549 (1973-08-01), Guth
patent: 3793230 (1974-02-01), Dorn et al.
patent: 3962137 (1976-06-01), Taylor
patent: 4485190 (1984-11-01), Sherif
Chemisches Zentralblatt, 1963, Nr. 15, pp. 5693 and 5761.
Sulphur, No. 138, Sep./Oct. 1978, pp. 39-41.

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