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Issue
Korean Journal of Chemical Engineering,
Vol.34, No.5, 1346-1357, 2017
CO2/O2-oxidative dehydrogenation of ethane to ethylene over highly dispersed vanadium oxide on MgO-promoted sulfated-zirconia nanocatalyst: Effect of sulfation on catalytic properties and performance
Taghavinezhad P, Haghighi M, Alizadeh R
The ZrO2 was treated by various molarities of H2SO4 solution (0, 0.5, 1 and 2) then mixed by MgO and impregnated with 5 wt% of V2O5. The synthesized catalysts were characterized by XRD, FESEM, PSD, EDX, BET and FTIR techniques. According to the results obtained by characterization studies, the modification of MgO-ZrO2 support by various molarities of H2SO4 solution had a great impact on the crystallinity, morphology and functional groups of prepared nanocatalysts. On the other hand, the catalytic activity of synthesized nanocatalysts in the oxidative dehydrogenation of ethane to ethylene is affected by the sulfur content on the support. The crystalline structures of MgO and ZrO2 were confirmed by XRD analysis. The crystallinity of tetragonal ZrO2 was decreased by increasing H2SO4 molarity used in ZrO2 (Sx) synthesising. The highest catalytic performance and ethylene productivity (C2H4 yield of 48% and ethane conversion of 79% at 700 °C) were obtained on the V2O5/MgO-ZrO2 (S1) nanocatalyst. This could be related to the superior acid-base property, smaller particles, better dispersion of active phase and uniform morphology of V2O5/MgO-ZrO2 (S1).
Keywords: Impregnation; Precipitation; V2O5/MgO-ZrO2; Dehydrogenation; Ethane; Ethylene
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