期刊
JOURNAL OF CATALYSIS
卷 272, 期 1, 页码 131-139出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.03.004
关键词
Selective n-butane oxidation; VPO catalysts; Mars-van-Krevelen mechanism; V5+ species; Solid-state NMR spectroscopy
资金
- Deutsche Forschungsgemeinschaft [HU533/9-2]
- Fonds der Chemischen Industrie
Bulk VPO catalysts (VPO/bulk) and VPO catalysts supported on mesoporous SBA-15 material (VPO/SBA-15) were treated sequentially in a flow of nitrogen loaded with n-butane and of synthetic air loaded with n-butane in order to reach a complete reduction and reoxidation, respectively, of the catalyst surface. The V5+ species on these VPO catalysts were quantitatively investigated by solid-state NMR spectroscopy and correlated with the catalytic activities of the corresponding materials in the selective oxidation of n-butane to maleic anhydride. By P-31{H-1} cross-polarization MAS NMR experiments on the n-butane-loaded VPO/SBA-15 catalyst was evidenced that n-butane is preferentially adsorbed at surface sites of (delta-VOPO4-like phases. Based on the number of P/V5+ species in delta-VOPO4-like phases as determined by MAS NMR spectroscopy, the turnover frequency of the surface sites on the VPO/SBA-15 catalyst was estimated to be about 0.2 s(-1). (C) 2010 Elsevier Inc. All rights reserved.
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