γ?Al₂O₃ is commonly used as a carrier for catalysts, and the physicochemical properties of its surface greatly influence the catalytic reaction. The exposed Al coordination environment can be regulated by adjusting the morphology of γ?Al₂O₃ carriers by changing the synthesis method and synthesis conditions. The energy of the exposed crystal lattice of carriers with different morphologies is different, which will directly affect the acidity of the carrier and the interaction between active metals, and active metals and carriers, thus creating different loading sites of active metals. Carrier morphology control is an effective way to regulate the structure of the active components. The regulation of the support morphology of the propane dehydrogenation catalyst will affect the catalytic performance. The research progress of γ?Al₂O₃ support was reviewed from the aspects of preparation method, morphology control, and its influence on propane dehydrogenation catalyst.

The properties of alumina supports are the key factors affecting the propane dehydrogenation performance of Pt?Sn/γ?Al₂O₃ catalysts.In this paper,γ?Al₂O₃ supports were prepared at three calcination temperatures of 450,650,850 ℃,and the structures and properties of the supports and supported catalysts were systematically studied by XRD,XRF,NH₃?TPD,Py?FTIR, CO?FTIR,OH?FTIR,and other characterization methods.The properties of the propane dehydrogenation reaction were evaluated by a fixed?bed micro?reaction evaluation device with online analysis,and the gas?phase product distribution and coking properties were analyzed.The results show that with the increase in calcination temperature,the surface acid content of γ?Al₂O₃ supports decreases,and calcination at 850 ℃ almost eliminates the weak L acid centers on the surface.This indicates that the number of coordinated unsaturated Al sites on the surface of γ?Al₂O₃ and surface hydroxyl groups decreases as the calcination temperature grows,which is not conducive to the high dispersion of metal active centers.Both CO?FTIR and TEM results confirm the formation of larger Pt clusters on Pt?Sn/γ?Al₂O₃?850,and more Pt active phase structure with saturated coordination can promote the occurrence of side reactions such as deep dehydrogenation and reduce the selectivity of propylene products.