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Vanadium Oxide Supported on Titanosilicates for the Oxidative Dehydrogenation of n-Butane

Author:
Wang, Cun, Chen, Jian-Gang, Xing, Tian, Liu, Zhao-Tie, Liu, Zhong-Wen, Jiang, Jinqiang, Lu, Jian
Source:
Industrial & Engineering Chemistry Research 2015 v.54 no.14 pp. 3602-3610
ISSN:
1520-5045
Subject:
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, butanes, catalysts, catalytic activity, dehydrogenation, engineering, nitrogen, oxygen, porous media, surface area, temperature, titanium dioxide, transmission electron microscopy, vanadium
Abstract:
Vanadium-containing titanosilicates and V-containing SBA-15 catalysts for oxidative dehydrogenation (ODH) of n-butane at lower temperatures and with lower vanadia contents were contrastively studied. The catalysts were investigated by various techniques, namely, N₂ adsorption–desorption, SAXS, TEM, FT-IR, XRD, XRF, H₂-TPR, O₂-TPD, and XPS, in relation to their performance for the ODH of n-butane. Results reveal that titanosilicate materials synthesized exhibit mesoporous structure, high BET specific surface area, and high total pore volume. H₂-TPR, O₂-TPD, and XPS results show that lattice oxygen exists in the surface of the V-containing titanosilicate catalysts and enhances the reducibility of vanadia-based catalysts with increasing TiO₂ loadings. The V-containing titanosilicate catalysts exhibit much higher catalytic activity for the ODH of n-butane than that of V-containing SBA-15 at a significantly lower temperature of 460 °C, which indicates that lattice oxygen in the catalyst plays an important role in the activation of n-butane.
Agid:
5382571