A series of SBA-15-supported chromia-ceria catalysts with 3％ Cr and 1％-5％ Ce (3Cr-Ce/SBA) were prepared using an incipient wetness impregnation method.The catalysts were characterized by XRD,N2 adsorption,SEM,TEM-EDX,Raman spectroscopy,UV-vis spectroscopy,XPS and H2-TPR,and their catalytic performance for isobutane dehydrogenation with CO2 was tested.The addition of ceria to SBA-15-supported chromia improves the dispersion of chromium species.3Cr-Ce/SBA catalysts are more active than SBA-15-supported chromia (3Cr/SBA),which is due to a higher concentration of Cr6+ species present on the former catalysts.The 3Cr-3Ce/SBA catalyst shows the highest activity,which gives 35.4％ isobutane conversion and 89.6％ isobutene selectivity at 570 ℃C after 10 min of the reaction.
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