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Influence of aging temperature and Mg/Zr molar ratio on transformation of C2H6 to C2H4 over VOx catalyst supported on Mg–Zr nanocomposite

  • Parisa Taghavinezhad
  • Mohammad Haghighi
  • Reza Alizadeh
Article
  • 7 Downloads

Abstract

To identify active and selective catalysts for oxidative dehydrogenation of ethane in presence of CO2, MgO–ZrO2 supports with varying amounts (0–100 wt%) of ZrO2 were synthesized via a coprecipitation method then impregnated with NH4VO3. In addition, the impact of the aging temperature on the structural properties and catalytic activity was examined. To characterize the prepared catalysts, X-ray diffraction (XRD) analysis, field-emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) spectroscopy, Brunauer–Emmett–Teller (BET) measurements, ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy (DRS), and Fourier-transform infrared (FTIR) analysis were applied. The results of XRD and EDX analyses confirmed successful synthesis of MgO–ZrO2 nanocomposite. In presence of zirconia, the dispersion of V-species was improved, decreasing the particle size of vanadium oxide and thus promoting the catalytic activity. However, for higher concentration of ZrO2 on the support, agglomeration of particles was observed and the ratio of the tetragonal to monoclinic phase of zirconia decreased. On the other hand, the presence of MgO stabilized the tetragonal phase of zirconia. According to the applied characterization methods and catalytic activity tests, VOx/ZrO2(25)–MgO(75)-A was selected as the most active catalyst, showing C2H4 yield of 60.13 % as well as ethane conversion of 67.14 % at 700 °C. This catalyst remained stable during 10 h on stream at 700 °C, indicating that the presence of a proper amount of zirconia not only increased the activity of the catalyst but also prevented its deactivation.

Keywords

Mg–Zr nanocomposite Mg/Zr molar ratio Structural/morphology evolution Oxidative dehydrogenation Ethylene 

Notes

Acknowledgements

The authors are grateful to Sahand University of Technology and Iran Nanotechnology Initiative Council for their complementary financial support of this research.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Chemical Engineering FacultySahand University of TechnologySahand New Town, TabrizIran
  2. 2.Reactor and Catalysis Research Center (RCRC)Sahand University of TechnologySahand New Town, TabrizIran

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