Effect of High-temperature Pretreatment on Catalytic Propane Dehydrogenation over Co@MFI Catalysts
Cobalt based catalysts are promising for propane dehydrogenation to propylene owing to their low price and environmentally friendly.However,their application in propane dehydrogenation is limited due to the deactivation caused by carbon deposition at high temperature and the low catalytic activity exhibited at low temperatures.In this work,Co@MFI Catalysts were synthesized by one pot hydrothermal method using Co(NO3)2 as the Cobalt source and tetraethyl orthosilicate(TEOS)as the silicon source,and were used for propane nonoxidative dehydrogenation to propylene.The experimental results proved that high-temperature pretreatment in an inert atmosphere can significantly improve initial activity of the Co@MFI catalysts.Characterization results of XRD,XPS,H2-TPR showed that highly dispersed and difficult to reduce Co(Ⅱ)was an active species for dehydrogenation.High temperature inert gas pretreatment can remove surface water via the surface dehydroxylation effect of the catalyst,thereby increase the number of active sites.The research results provide an effective method for improving the low-temperature propane dehydrogenation activity of the catalysts.
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