Double Layer Catalyst Bed for Removing So2 from Waste Gases.
Haas-LA; Khalafalla-SE; McCormick-TH
U S Pat 3 888 970 1975 Jun; :
Dry waste gas containing so2 and CO (mole ratio 1:2) was heated to 400 deg c and passed through a double-layer catalyst to form a product gas having <12.5 pct of the original amount of s compounds after gaseous s compounds separation. The first catalyst layer (fe, cr, ni, CO, or mn supported on al2o3 pellets) was two times the weight of the second layer (al2o3 only). Thus, an fe-al2o3 catalyst was prepared by pelletizing <10 micrometer fe2o3 and <0.05 Um y- alumina powders, heating at 1,200 deg c for 2 h and reducing with h2 at 600 deg c for 1 h.
U.S. Pat. 3,888,970; June 10, 1975; Chem. Abstr. 84:64,807K