Abstract
V-SBA-16 catalysts with uniform cubic mesoporous structure were prepared by direct hydrothermal method as a function of the pH of the initial gel and characterized by ICP, XRD, TEM, N2 adsorption–desorption, DRUV—vis and Raman spectra. The pH of the initial gel in synthesis of V-SBA-16 show important effects on the maintenance of well ordered mesoporous structure, introduced vanadium content and the incorporation of vanadium into the network of SBA-16 type mesoporous material. The initial gel system with a pH value of 2.0 was found to be a suitable for incorporation of vanadium and retaining the mesostructure of SBA-16. The catalytic activities of V-SBA-16 catalysts were evaluated for the hydroxylation of benzene using molecular O2 as the oxidant. The highest phenol yield of 30.4% with a selectivity of 90% and turnover number of 105 were obtained over the VS-2.0 (1.67) sample prepared at the initial gel system with pH value of 2.0, which is attributed to its high V content and uniform framework V species that highly dispersed on the well ordered SBA-16 type mesoporous materials.
Graphical Abstract
V-SBA-16 catalysts with ordered cubic mesoporous structure, highly dispersed framework V species and relative high vanadium content are prepared by one-pot hydrothermal method with pH adjusting and show fascinating catalytic activity for benzene hydroxylation to phenol.
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Acknowledgments
This work is supported by the Natural Science Foundation of China (20876034), Program for New Century Excellent Talents in Heilongjiang Provincial University (1155-NCET-014), Major Foundation of Educational Commission of Heilongjiang Province of China (11531Z11) and Heilongjiang University Natural Science Funds for Distinguished Young Scholar (JCL200802). The authors also thank Dr. Alexander D. Gordon (Department of Chemistry, University of California, Riverside, USA) for his help in the use of the English language.
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Zhao, L., Dong, Y., Zhan, X. et al. One-pot Hydrothermal Synthesis of Mesoporous V-SBA-16 with a Function of the pH of the Initial Gel and its Improved Catalytic Performance for Benzene Hydroxylation. Catal Lett 142, 619–626 (2012). https://doi.org/10.1007/s10562-012-0773-9
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DOI: https://doi.org/10.1007/s10562-012-0773-9