Solid-state ⁵¹V NMR and its potentiality in investigation of vanadia systems with paramagnetic centres

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• 作者：Aleks ; r A. Shubin ; Dzhalil F. Khabibulin ; Olga B. Lapina
• 关键词：Vanadium oxide catalysts ; Paramagnetic centers ; ⁵¹V NMR ; Solid-state NMR
• 刊名：Catalysis Today
• 出版年：2009
• 出版时间：30 April 2009
• 年：2009
• 卷：142
• 期：3-4
• 页码：220-226
• 全文大小：403 K

文摘

In this article we will discuss the potentiality of solid-state ⁵¹V NMR technique to characterize heterogeneous catalysts containing paramagnetic cations located on the surface or incorporated in the bulk of heterogeneous catalysts. ⁵¹V NMR data for a number of 3d and rare earth vanadates, where paramagnetic effects are caused by the presence of paramagnetic cations, are considered. We also summarize results available for vanadium bronzes, where some vanadium is in a paramagnetic V⁴⁺ state, and for some vanadium compounds, where closely spaced paramagnetic centers form diamagnetic pairs. The comprehensive ⁵¹V chemical shift scale (database) for paramagnetic solids was compiled.