Abstract
SnO 2–ZrO 2 nanocomposite catalysts with different compositions ranging from 0 to 100% of SnO 2 were prepared at room temperature by co-precipitation method using aqueous ammonia as a hydrolyzing agent. X-ray diffraction, transmission electron microscopic characterization revealed the SnO 2–ZrO 2 nanocomposite behavior. Acid–base properties of these catalysts were ascertained by temperature-programmed desorption (TPD) of NH 3 and CO 2. Both acidic and basic sites distribution of the nanocomposite catalysts is quite different from those of respective single oxides (SnO 2 or ZrO 2). Catalytic activity of these nanocomposite catalysts for ethylbenzene dehydrogenation (EBD) to styrene in the presence of excess CO 2 was evaluated. The change in the acid–base bi-functionality of the nanocomposite catalysts in comparison with single oxides had profound positive influence in enhancing the catalytic activity.
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