Abstract
In 2O 3–MO x binary mixed metal oxide catalysts (M: Al, Zn, Zr, Ti, Fe, Mg, Si, and Ce) prepared by a coprecipitation or sol–gel method have been tested for the dehydrogenation of propane to propylene in the presence of carbon dioxide. Several techniques including N 2 adsorption/desorption, X-ray diffraction, H 2-temperature-programmed reduction and X-ray photoelectron spectroscopy were applied to characterize the physicochemical properties of the as-synthesized materials. Catalytic tests showed that all In-containing samples were active in the CO 2-promoted dehydrogenation of propane with good propylene selectivity. Among the In 2O 3–MO x catalysts tested, the In 2O 3–Al 2O 3 sample containing a 20 mol% indium content showed the highest dehydrogenation activity with superior long-term stability. The specific interaction between In 2O 3 and Al 2O 3 leading to a high component dispersion is suggested to play a key role in regulating the redox and structural properties of surface indium species, which makes the In 2O 3–Al 2O 3 composite highly active and stable for the reaction.
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