Abstract
Five supported Pt catalysts (Pt/SBA-15, Pt/Al2O3, Pt/MgO, Pt/CeO2, and Pt/Ce0.63Zr0.37O2 ) were prepared to systematically investigate the influence of oxygen mobility over the support on combustion temperatures of coke produced in propane dehydrogenation. A strong correlation between the oxygen mobility of the supports and the combustion temperature of the coke was observed. The coke combustion temperatures increased following the reverse order of oxygen mobility of the supports: CeZrO2 > CeO2 > MgO > Al2O3 > SBA-15, implying that the oxygen transfer over supports was a rate-determining step in the coke combustion process. [Coke combustion was performed in a TGA instrument under air flow with a heating rate of 5 °C/min. The support with higher oxygen mobility resulted in a lower coke combustion temperature.]
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