Nano ZSM-5 type ferrisilicates as novel catalysts for ethylbenzene dehydrogenation in the presence of N2O

CATEGORY: NANOTECH
Applied Surface Science, Volume 258, Issue 2, 1 November 2011, Pages 865–872
Nano ZSM-5 type ferrisilicates as novel catalysts for ethylbenzene dehydrogenation in the presence of N₂O
M. Khatamian^a,
mkhatamian@yahoo.com
A.A. Khandar^a,
M. Haghighi^b,
M. Ghadiri^{a, c
a} Inorganic Chemistry Department, Faculty of Chemistry, University of Tabriz, C.P. 51664, Tabriz, Iran
^b Reactor and Catalysis Research Center (RCRC), Chemical Engineering Department, Sahand University of Technology, P.O. Box 51335-1996, Sahand New Town, Tabriz, Iran
^c Department of Sciences, Urmia University of Technology, Urmia 57155-419, Iran
Abstract
Researchers used a hydrothermal process to prepare nanosized ZSM-5 type ferrisilicates. They studied a number of parameters including gel initiative compositions (Na⁺ or K⁺ alkali system), SiO₂/Fe₂O₃ molar ratios and hydrothermal temperature.
Using several characterization techniques, they observed that surface areas and the total pore volume increase with an increase in the SiO₂/Fe₂O₃ molar ratio at Na-FZ ferrisilicates. The catalytic performance of the synthesized catalysts was evaluated in ethylbenzene dehydrogenation to styrene in the presence of N₂O or steam at temperatures ranging from 400 °C to 660 °C under atmospheric pressure. The effects of gel initiative compositions, SiO₂/Fe₂O₃ molar ratio as well as the hydrothermal synthesis temperature on the catalytic performance of these catalysts were addressed. They demonstrate that styrene yield is significantly influenced by altering the the SiO₂/Fe₂O₃ ratio.  However, the yield is not much affected by changes in hydrothermal synthesis temperatures.
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