Journal
NEW JOURNAL OF CHEMISTRY
Volume 43, Issue 29, Pages 11554-11563Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj02007a
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Funding
- Council of Scientific and Industrial Research [9/468(0402)/2009-EMR-I]
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Vanadium incorporated mesoporous SBA-15 and KIT-6 catalysts were prepared by a direct hydrothermal method under mild acidic reaction conditions. The structural features of the catalysts have been thoroughly investigated by using various characterization techniques including N-2-physisorption, X-ray diffraction, V-51 NMR spectroscopy, Raman spectroscopy, H-2-TPR, and XPS. The characterization results revealed that under hydrated conditions, the incorporated vanadium was highly dispersed on the surface of SBA-15 and KIT-6 catalysts with octahedral coordination. However, the various spectral analyses manifest that the local environment of vanadium is entirely different for SBA-15 and KIT-6 supports. The influence of the supports and their catalytic activity for the diphenylmethane oxidation reaction are investigated. The efficiency of the catalysts was compared in terms of a constant level of vanadium loading on both the catalysts, and it was observed that the V-KIT-6 catalyst exhibited better catalytic activity than V-SBA-15. The enhanced activity of the V-KIT-6 catalyst was mainly attributed to the presence of a large portion of vanadium on the external walls with the V5+ oxidation state. The deactivation study was performed on both catalysts and it was found that both catalysts exhibited a similar level of conversion and selectivity under identical experimental conditions. In addition, the catalytic activity was directly correlated with various characterization results.
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