Tungstophosphoric heteropolyacid supported onto neutral alumina:characterization and synthesis of acetals and ketals
来源期刊：Rare Metals2007年第2期
论文作者：GAO Jinzhang, WEI Yunxia, WANG Xuemei, and YANG Wu Chemistry & Chemical Engineering College, Northwest Normal University, Lanzhou , China
文章页码：152 - 157
摘 要：Tungstophosphoric acid （HPW） catalyst supported on the neural alumina was studied. It was prepared by means of an equilibrium and incipient wetness impregnation technique. Solution of HPW in 50% V/V ethanol-water was used to impregnate Al2O3 at 25°C. It was found that the catalyst containing 30% PW by calcination at 500°C showed a higher catalytic activity in the synthesis of acetals and/or ketals. In the following condition, that is, the molar ratio of aldehyde/ketone to glycol being 1:1.5,the mass fraction of the catalyst used was 0.5%, and the reaction time was 1.0 h; the yields of ketals and acetals could reach up to 60.5%-86.7%. Moreover, it could be easily recovered and reused.
GAO Jinzhang, WEI Yunxia, WANG Xuemei, and YANG Wu Chemistry & Chemical Engineering College, Northwest Normal University, Lanzhou 730070, China
摘 要：Tungstophosphoric acid （HPW） catalyst supported on the neural alumina was studied. It was prepared by means of an equilibrium and incipient wetness impregnation technique. Solution of HPW in 50% V/V ethanol-water was used to impregnate Al2O3 at 25°C. It was found that the catalyst containing 30% PW by calcination at 500°C showed a higher catalytic activity in the synthesis of acetals and/or ketals. In the following condition, that is, the molar ratio of aldehyde/ketone to glycol being 1:1.5,the mass fraction of the catalyst used was 0.5%, and the reaction time was 1.0 h; the yields of ketals and acetals could reach up to 60.5%-86.7%. Moreover, it could be easily recovered and reused.
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