The Complete 51V MAS NMR Spectrum of Surface Vanadia Nanoparticles on Anatase (TiO2): Vanadia Surface Structure of a DeNOx Catalyst

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• 作者：Ulla Gro Nielsen ; Nan-Yu Tops//pubs.acs.org/images/gifchars/oslash.gif" border="0">e ; Michael Brorson ; J//pubs.acs.org/images/gifchars/oslash.gif" border="0">rgen Skibste
• 刊名：Journal of the American Chemical Society
• 出版年：2004
• 出版时间：April 21, 2004
• 年：2004
• 卷：126
• 期：15
• 页码：4926 - 4933
• 全文大小：193K
• 年卷期：v.126,no.15(April 21, 2004)
• ISSN：1520-5126

文摘

The first observations of the complete manifold of spinning sidebands (ssbs) including both thecentral and satellite transitions in ⁵¹V MAS NMR spectra of surface vanadia nanoparticles on titania inDeNO_x catalysts are presented. ⁵¹V quadrupole coupling and chemical shift anisotropy parameters for thedominating vanadia structure are determined from ⁵¹V MAS NMR spectra recorded at 9.4 and 14.1 T.Based on correlations previously established between ⁵¹V NMR parameters and crystal structure data forinorganic vanadates, the NMR data are consistent with vanadium in a distorted octahedral oxygencoordination environment for the so-called strongly bonded vanadia species on the surface. The investigationincludes two vanadia-titania model catalysts and six industrial-type DeNO_x catalysts.