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Journal of Chemical Sciences

, Volume 127, Issue 4, pp 701–709 | Cite as

Studies on ethylbenzene dehydrogenation with CO2 as soft oxidant over Co3O4/COK-12 catalysts

  • RAMUDU POCHAMONI
  • ANAND NARANI
  • MOHAN VARKOLU
  • MURALI DHAR GUDIMELLA
  • S SAI PRASAD POTHARAJU
  • DAVID RAJU BURRI
  • SEETHA RAMA RAO KAMARAJUEmail author
Article

Abstract

Oxidative dehydrogenation of ethylbenzene to styrene has been studied over Co3O4 supported on mesoporous silica (COK-12) with CO2 as soft oxidant in a fixed bed reactor at atmospheric pressure in the temperature range of 723 to 923K. While COK-12 has been prepared by self-assembly method using long chain ionic surfactant i.e., P123 as template, cobalt oxide supported on COK-12 catalysts with variable Co content have been synthesised by simple wet impregnation technique. All the catalysts were characterized by N2 adsorption - desorption, XRD, FT-IR, TPR, UV-Vis and XPS techniques. XRD and pore size distribution studies indicate the intactness of mesoporous structure of SiO2 even after incorporation of Co3O4. Presence of Co3O4 crystallites were observed beyond 5 wt% Co loading. High ethylbenzene conversion and stable styrene yields have been observed over 3% Co3O4/COK-12 catalyst due to the presence of large number of active Co3O4 catalytic sites. Enhancement in the activity has been observed with CO2 as soft oxidant than with N2 as diluent. This is because of the fact that the liberated H2 reacts with CO2 in the form of reverse water gas shift reaction.

Graphical Abstract

3 weight% Co3O4 on COK-12 catalyst exhibits good and stable activity in the oxidative dehydrogenation of ethyl benzene to styrene due to the presence of smaller Co3O4 particles.

Keywords

Co3O4/COK-12 ethylbenzene dehydrogenation CO2 soft oxidant styrene 

Notes

Acknowledgements

The authors thank Department of Science & Technology (DST), New Delhi, India for sanctioning a project (DST/IS-STAC/CO2-SR-136/12(C))under CO2 sequestration scheme. PR and AN acknowledge Council of Scientific and Industrial Research (CSIR), New Delhi, India for the award of CSIR fellowship.

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Copyright information

© Indian Academy of Sciences 2015

Authors and Affiliations

  • RAMUDU POCHAMONI
    • 1
  • ANAND NARANI
    • 1
  • MOHAN VARKOLU
    • 1
  • MURALI DHAR GUDIMELLA
    • 2
  • S SAI PRASAD POTHARAJU
    • 1
  • DAVID RAJU BURRI
    • 1
  • SEETHA RAMA RAO KAMARAJU
    • 1
    Email author
  1. 1.Catalysis LaboratoryIndian Institute of Chemical TechnologyHyderabadIndia
  2. 2.Chemical Engineering DepartmentGayatri Vidya Parishad College of EngineeringVisakhapatnamIndia

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