Abstract
A rapid non-sodium process was developed to synthesize highly ordered V-MCM-41 mesoporous materials with atomic level dispersed vanadium species. NH3·H2O instead of NaOH was used to maintain the moderately basic synthesis condition. The characterization results of N2 physisorption and XRD showed that the synthesized samples had highly ordered hexagonal structure. UV–Vis, UV-Raman, and EPR spectra provided evidence that most vanadium ions were tetrahedrally incorporated into the framework of siliceous MCM-41. The NH3-TPD proved the mild acidity of V-MCM-41 due to the incorporation of vanadium cations. The most important variables were structural order and vanadium loading which can be controlled easily by changing synthesis variables in such a way that collapse of the V-MCM-41structure did not occur. The synthesized V-MCM-41 catalysts successfully catalyzed the isomerization of heptene. High conversion and isomer selectivity were achieved with good catalytic stability. The structure of V-MCM-41 can be well preserved after reaction.
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The authors thank AcRF tier 2 (M45120006 ARC 13/07) for providing funding support. The financial support of AcRF tier 1 (M52120049 RG45/06) is gratefully acknowledged.
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Hu, S., Liu, D., Li, L. et al. A Non-sodium Synthesis of Highly Ordered V-MCM-41 and Its Catalytic Application in Isomerization. Catal Lett 129, 478–485 (2009). https://doi.org/10.1007/s10562-008-9826-5
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DOI: https://doi.org/10.1007/s10562-008-9826-5