| 摘要 |
A catalyst comprises alumina as support, chromium oxide (preferably 5-25%; Cr2O3 and CrO3 mentioned), a spinel (preferably 0.1-10%), and preferably an alkali metal, particularly potassium. The spinel, the amount of which may be, for example, 2-5% and less than the amount of chromium oxide, is described as a compound of face-centred cubic crystal structure of general formula MM12O4, wherein M and M1 are metals; the valencies of the latter may vary, as indicated by the general formul M12O.MO3, 2M1O.MO2 and M12O3.MO. Preferred spinels are cobalt, copper and iron chromites (including natural "chrome ironstone") and zinc titanate. Promoting elements in the catalyst are preferably present in an amount of 0.1-5% (as oxide). The catalyst is used for the dehydrogenation or dehydrocyclization at elevated temperature of feedstocks consisting of or containing non-aromatic hydrocarbons (preferably C5-7); the following features of the process are preferred:-pressure less than 50 p.s.i.g., hydrogen not added, temperature 450-580 DEG C., space velocity 0.1-1 v./v./hr., product has research octane number at least 100, the feedstock is a straight-run distillate or a catalytic (particularly platinum) reformate.ALSO:A catalyst comprises alumina as support, chromium oxide (preferably 5-25%), a spinel (preferably 0.1-10, particularly 2-5%) which is preferably cobalt, copper or iron chromite or zinc titanate, and an alkali metal, preferably potassium. The catalyst is used for dehydrogenation or dehydrocyclization at elevated temperature of feedstocks consisting of or containing non-aromatic (preferably C5-7) hydrocarbons. The following features of the process are preferred: pressure less than 50 p.s.i.g., hydrogen not added, temperature 450-580 DEG C., space velocity 0.1-1 v/v/hr., product has research octane number at least 100, the feedstock is a straight-run distillate or a catalytic (particularly Pt) reformate. |
