首页|Effective synthesis of vanadium-doped mesoporous silica nanospheres by sol-gel method for propane dehydrogenation reaction
Effective synthesis of vanadium-doped mesoporous silica nanospheres by sol-gel method for propane dehydrogenation reaction
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NSTL
Elsevier
The vanadium-doped mesoporous silica nanospheres (nV-MSNs) with worm-like porous structure were successfully synthesized by simple sol-gel method and applied to propane dehydrogenation (PDH) reaction. The moderate introduction of vanadium species didn't affect the self-assembly of the worm-like porous structure of support. The prepared samples were characterized by X-ray diffraction (XRD), Raman, X-ray photoelectron spectra (XPS), temperature-programmed desorption (TPD) of NH3 and temperature-programmed reduction (TPR) with H-2 to investigate the influence of the chemical states of VOX on the catalytic properties in PDH reaction. It is found that the appropriate amount and high dispersion degree of VOX species of the nV-MSNs catalyst is the key to obtain excellent catalytic performance in PDH. It is shown that 9V-MSNs catalyst exhibits optimum reaction activity with an initial propane conversion of 50.6% at 600 degrees C. The catalyst obtains the maximum percentage of active V-V species, and has better vanadium dispersion than others, which is demonstrated by Raman and XPS analysis. 9V-MSNs catalyst also exhibits outstanding activity and stability in reaction-regeneration for six cycles. Hence, the prepared nV-MSNs catalysts hold immense potential to further development in application of PDH.
NSTL
Elsevier
