A kind of chromium-bismuth catalyst of preparing propylene by dehydrogenating propane, preparation method and application

Chromium bismuth catalyst, preparation method and application the invention discloses a kind of preparing propylene by dehydrogenating propane.The catalyst includes：Oxide carrier, chromium and bismuth；Wherein chromium content is 8wt%~35wt% of overall catalyst weight；Bi content is 0.1wt%~5wt% of overall catalyst weight；Oxide carrier accounts for 10wt%~92wt% of overall catalyst weight；The molar ratio range of chromium and bismuth is (5~80) in the chromium bismuth catalyst:1；The oxide is selected from silica, diatomite, calcium silicates, zirconium oxide, titanium oxide, the one or more of aluminium oxide.The catalyst of the present invention not only has the characteristics that stability is good, but also activity height, high selectivity can convert propane to propylene, and catalyst has higher space-time yield, has good stability under conventional reaction condition with higher yield.