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Oxidative dehydrogenation of ethylbenzene to styrene with CO2 over SnO2–ZrO2 mixed oxide nanocomposite catalysts

✍ Scribed by David Raju Burri; Kwang-Min Choi; Dae-Soo Han; Sujandi; Nanzhe Jiang; Abhishek Burri; Sang-Eon Park

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
812 KB
Volume
131
Category
Article
ISSN
0920-5861

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✦ Synopsis

SnO 2 -ZrO 2 nanocomposite catalysts with different compositions ranging from 0 to 100% of SnO 2 were prepared at room temperature by coprecipitation 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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