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Catalytic Oxidation of Benzaldehyde to Benzoic Acid with Keggin Polyoxometalate [(CH2)5NH2]3PW12O40
Corresponding Author(s) : Fei- Lu
Asian Journal of Chemistry,
Vol. 25 No. 2 (2013): Vol 25 Issue 2
Abstract
The organic-inorganic hybrid catalyst [(CH2)5NH2]3PW12O40 was prepared by heteropoly acid and piperidine. The heteropoly acid was synthesized by sodium molybdate and sodium silicate and the piperidine was organic ligand. The proposed composition and structure of the catalyst were evidenced by FT-IR, XRD and TG-DTA. The results indicated that the heteropoly anions reserved their Keggin structure in the compound. Its catalytic performance was evaluated in the oxidation of benzaldehyde to benzoic acid. Various reaction parameters were changed to attain the optimal conditions. The optimal reaction conditions were found to be: n(catalyst):n(benzaldehyde) = 3.103 × 10-3:1; n(H2O2):n(benzaldehyde) = 4.0:1; reaction temperature 80 ºC; reaction time 4 h. The yield of benzoic acid achieved above 93 %, furthermore and the selectivity was 100 %.
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References
M.T. Pope, Heteropoly and Isopoly Oxometalates, Spring Verlag, Berlin (1983).
I.V. Kozhevnikov, Chem. Rev., 98, 171 (1998).
A. Dolbecq, E. Dumas, C.R. Mayer and P. Mialane, Chem. Rev., 110, 6009 (2010).
S.Q. Liu and Z.Y. Tang, Nano Today, 5, 267 (2010).
W. Qi and L.X. Wu, Polym. Int., 58, 1217 (2009).
Y.X. Qiao and Z.S. Hou, Curr. Org. Synth., 13, 1347 (2009).
P. Liu, Y. Liang, X.Z. Lin, C.X. Wang and G.W. Yang, AcCS Nano, 5, 4748 (2011).
A. Aouissi, Asian J. Chem., 22, 4924 (2010).
S.T. Zheng, J. Zhang and G.Y. Yang, Angew. Chem. Int. Ed., 47, 3909 (2008).
X.L. Wang, C. Qin, E.B. Wang, Z.M. Su, Y.G. Li and L. Xu, Angew. Chem. Int. Ed., 45, 7411 (2006).
N. Zou, W.L. Chen, Y.G. Li, W.L. Liu and E.B. Wang, Inorg. Chem. Commun., 11, 1367 (2008).
S.W. Lin, W.L. Chen, Z.M. Zhang, W.L. Liu and E.B. Wang, Acta Crystallogr., E64, m954 (2008).
R.D. Cluade, F. Michel, F. Raymonde and T. Rene, Inorg. Chem., 22, 207 (1983).
C.N. Kato, A. Shinohara, K. Hayashi and K. Nomiya, Inorg. Chem., 45, 8108 (2006).
V.F. Chuvaev, K.I. Popov and V.I. Spitsyn, Dokl. Akad. Nauk. SSSR, 255, 892 (1980).