| 摘要 |
1280073 Oxide composition BP CHEMICALS Ltd 19 April 1971 [20 March 1970] 13584/70 Heading B1E An antimony-tin oxide composition in pellet or granular form is pretreated prior to pelleting or granulating by heating in an inert atmosphere, e.g. nitrogen or argon at 200 to 500‹C, the composition then being pelleted or granulated and finally calcined at 550 to 1000‹C in a molecular oxygen-containing gas. The composition may also contain Ti, Cr, Fe, Co, Ni, Cu, V, Mo, U and/or W. The composition is suitably formed by mixing the oxides, or by decomposing precursors thereof. The atomic ratio Sb:Sn is suitably 0.1:1 to 20:1, the atomic ratio of antimony to any other metals present suitably also being 0.1:1 to 20:1. The examples describe the preparation of catalysts containing: (i) Sb, Sn (in ratio 4:1); (ii) Sb, Sn, V (2:1:1); (iii) Sb, Sn, Fe (4:1:0.25); and Sb, Sn, V, Fe (3:1:1:0.4). |
