ESR Studies of the Effects of Counter Ions on V4+ Ion in Heteropolyacid Salts Catlysts

Chem. J. Chinese Universities ›› 1996, Vol. 17 ›› Issue (4): 622.

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ESR Studies of the Effects of Counter Ions on V⁴⁺ Ion in Heteropolyacid Salts Catlysts

ZHENG Ying-Guang¹, DONG Feng-Xia¹, WU Tong-Hao², JIA Ji-Fei²

1. Analytical Measurement Center, Jilin University, Changchun 130023;
2. Department of Chemistry, Jilin Unitiersity

Received:1995-04-03 Online:1996-04-24 Published:1996-04-24

Abstract

Abstract: The transition metal ions Cu²⁺ and V⁴⁺ in heteropolyacid salts used in one-stepoxidition of isobutyraldehyde(IBL)to produce methacrylic acid(MAA) were studied by ESRmethod.The convolution difference method was applied to the resolution enhancement ofESRspectra of transition metal ions.Spectral parameters of V⁴⁺ coordinated to heteropolyanion was detected from complicated and superposed spectra.Furthermore,α2 and Kwerecomputed.We have also discussed the effects of the counter ions Cu²⁺ and various kinds ofalkali metals on the electron cloud density and delocalization of unpaired electrons and property of V—O bond.

Key words: Heteropolyacid salt, Cu²⁺, V⁴⁺, ESR

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ZHENG Ying-Guang, DONG Feng-Xia, WU Tong-Hao, JIA Ji-Fei. ESR Studies of the Effects of Counter Ions on V⁴⁺ Ion in Heteropolyacid Salts Catlysts[J]. Chem. J. Chinese Universities, 1996, 17(4): 622.

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ESR Studies of the Effects of Counter Ions on V⁴⁺ Ion in Heteropolyacid Salts Catlysts

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