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Citation: MA Rong-Hua, LIU Chun-Tao, QU Lun-Yu. Synthesis,Characterization and Catalytic Activity of Niobium Substituted- and Monoperoxyniobium Heteropolytungstophosphates[J]. Chinese Journal of Applied Chemistry, ;2000, 17(5): 487-490. shu

Synthesis,Characterization and Catalytic Activity of Niobium Substituted- and Monoperoxyniobium Heteropolytungstophosphates

1.
a Department of Chemistry, Qiqihar University, Qiqihar 161006;
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b Qiqihar Environment Surveillance Center, Qiqihar;
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c College of Chemistry, Northeast Normal University, Changchun

Received Date: 28 December 1999
Available Online: 8 May 2000
Fund Project: 国家自然科学基金资助项目(29471009) (29471009)

The title heteropoly tungstophosphates M₄[PW₁₁NbO₂]·x H₂O(M=Me₄N⁺,Hep₄N⁺,K⁺) and M_nH_4-nPW₁₁(NbO₂)O₃₉]·x H₂O(M=Me₄N⁺,Et₄N⁺,Bu₄N⁺ and Hep₄N⁺) were synthesized and characterized. The IR, UV spectrometry, polarography and chemical titration confirmed the existence of NbO₂ groups in the complexes. All their ¹⁸³W NMR spectra have six peaks, showing the Keggin structure of anions in the com-pounds. Experiments on oxidation of maleic acid into tartaric acid showed that the complexes containing peroxy ions exhibited higher catalytic activity than those without peroxy ions.
- peroxyniobium heteropoly tungstophosphate,
- synthesis,
- catalytic activity
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