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Oxidative Dehydrogenation (ODH) of Ethylbenzene with \(\hbox {CO}_{2}\) and \(\hbox {N}_{2}\hbox {O}\) over Heteropolycompounds

  • Salem Cheknoun
  • Sadia Mansouri
  • Ouarda Benlounes
  • Smain Hocine
Regular Article
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Abstract

Heteropolyacids of Keggin structure, \(\hbox {H}_{3}\hbox {PMo}_{12}\hbox {O}_{40}\), \(\hbox {H}_{3}\hbox {PMo}_{11}\hbox {WO}_{40}\) and the salts \(\hbox {K}_{3}\hbox {PMo}_{11}\hbox {WO}_{40}\) and \(\hbox {K}_{2.5}\hbox {Fe}_{0.08}\hbox {H}_{0.26}\hbox {PMo}_{11}\hbox {WO}_{40}\) were characterized by X-ray diffraction (XRD), UV-Vis spectroscopy, Fourier transform infrared (FTIR), low-temperature nitrogen adsorption and \(^{31}\)P MAS NMR spectroscopy. The acid-base properties were evaluated using the isopropanol decomposition. They were tested in oxidative dehydrogenation (ODH) of ethylbenzene in the temperature range 300–400 \(^{\circ }\hbox {C}\) at atmospheric pressure with the mild oxidants carbon dioxide and nitrous oxide, the major actors in the greenhouse effect. The results show that the best compromise between conversion and selectivity is obtained for the mixed K/Fe salt of \(\hbox {PMo}_{11}\hbox {WO}_{40}\) at a relatively low temperature, namely \(350^{\circ }\hbox {C}\).

Graphical Abstract

Synopsis:Heteropolycompounds of Keggin structure catalysed oxidative dehydrogenation of ethylbenzene with high selectivity to styrene. It was noted that acidic properties of the catalytic system, reaction conditions and catalyst composition affect the oxidative dehydrogenation reaction.

Keywords

Ethylbenzene oxidative dehydrogenation \(\hbox {CO}_{2}\) \(\hbox {N}_{2}\hbox {O}\) heteropolycompounds 

Notes

Supplementary material

12039_2018_1447_MOESM1_ESM.docx (794 kb)
Supplementary material 1 (docx 794 KB)

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  • Salem Cheknoun
    • 1
  • Sadia Mansouri
    • 1
  • Ouarda Benlounes
    • 1
  • Smain Hocine
    • 1
  1. 1.Laboratoire de Chimie Appliquée et de Génie ChimiqueUniversité M. Mammeri de Tizi-OuzouTizi-OuzouAlgeria

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