Korean Journal of Chemical Engineering, Vol.26, No.3, 654-659, May, 2009
Oxidation of cyclopentene catalyzed by tungsten-substituted molybdophosphoric acids
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A series of Keggin type tungsten-substituted molybdophosphoric acids (H3PMo12-nWnO40·XH2O) were synthesized and characterized by ICP-AES, FT-IR, TG-DSC, and XRD. The tungsten substitution extent significantly affected their catalytic activity in the oxidation of cyclopentene and the selectivity of the resultant products. The tungsten-substituted molybdophosphoric acids with tungsten substitution numbers in a range of 3-6.8 exhibited high catalytic activity in the oxidation of cyclopentene. After reaction for 8 h, the conversion of cyclopentene was up to 97%; the oxidation products mainly consisted of glutaraldehyde, cis-1,2-cyclopentanediol and trans-1,2-cyclopentanediol with the yields of ca. 23%, 27%, and 45%, respectively.
Keywords:Tungsten-substituted Molybdophosphoric Acid;Cyclopentene;Glutaraldehyde;cis-1,2-Cyclopentanediol;trans-1,2-Cyclopentanediol
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