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51V NMR and EPR Study of Reaction Kinetics and Mechanisms in V2O5 Gelation by IonExchange of Sodium Metavanadate Solutions

机译：偏二氧钒酸钠溶液离子交换反应动力学及V2O5凝胶化机理的51V NmR和EpR研究

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V2O5 gels produced by sol-gel methods have several potential uses in electronicsand catalysis, but the rate and mechanism of the synthesis remain poorly understood. Recent results disagree with models previously proposed. 51V NMR spectra show that the initial reactions involve the consumption of the dioxovanadium cation V (V) 02 (+). The only other vanadium (V) species in solution, decavanadic acid, acts only as a source of dioxovanadium cations for the polymerization through a dimerization reaction with the dioxovanadium cation. Hydrolysis of the polymer allows further decavanadic acid decomposition to the dioxovanadium cation by furnishing protons. 51V MAS NMR of the resulting colloidal suspensions indicates that the vanadium environment in the polymer is similar to that of the dioxovanadium cation.... V2O5, Metavanadate, Sol/gel, NMR, EPR.

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作者
Pozarnsky, G. A.; McCormick, A. V.;
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年度 1993
页码
总页数 27
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Vanadates; Reaction kinetics; Gelation; Catalysis; Cations; Decomposition; Hydrolysis; Polymerization; Spectra; Nuclear magnetic resonance; Electron; Electron paramagnetic resonance; Chemical reactions; Dimers; Colloids;

机译：钒酸盐;反应动力学;凝胶化;催化;阳离子;分解;水解;聚合;光谱;核磁共振;电子;电子顺磁共振;化学反应;二聚体;胶体;

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51V NMR and EPR Study of Reaction Kinetics and Mechanisms in V2O5 Gelation by IonExchange of Sodium Metavanadate Solutions

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