Activity Patterns in the Catalytic Reduction of So2 on Some Transition Elements in Alumina.
Haas-LA; McCormick-TH; Khalafalla-SE
NTIS: PB 210 988 :14 pages
So2 reduction with CO was studied in an integral flow reactor at a nominal flow of 0.5 Liter per minute. Reactant gas contained 3 percent so2, 6 percent CO, and the balance he. So2 conversion was determined for three different types of catalysts. The first consisted of 16 commercial catalysts used for various chemical syntheses. Only the commercial catalysts which contained transition metals in alumina removed more than 30 percent so2 at temperatures below 510 deg c. Two other types of catalysts were prepared in the laboratory either by pelletizing equal amounts of powdered alumina and transition metal oxides or by impregnating commercial alumina tablets with transition metal ions. Regardless of preparation techniques, cr and fe in alumina were the two best catalysts. The observed results suggest that an intermediate (sco) is formed by the interaction of surface metal sulfides and carbonyls. Alumina then catalyzes the interaction of sco with so2 to form the end products (sulfur and carbon dioxide). Over 80 percent so2 was removed at 460 deg c with 2 grams alumina impregnated with 2.5 percent iron.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 210 988