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℃. It was found that the catalyst containing 30% PW by calcination at 500℃ 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.
参考文献
| [1] | Kozhevnikov I .Catalysis by Heteropoly acids and multicomponent polyoxometalates in liquid-phase reactions[J].Chemical Reviews,1998,90:171. |
| [2] | Wang E B;Hu C W;Xu L.Introduction to Heteropolyacidic Chemistry[M].北京:化学工业出版社,1997:175. |
| [3] | Noritaka M;Makoto M .Heteropolyacid catalysts[J].Curr Opin Solid Sate Mater Sci,1997,2(01):84. |
| [4] | Misono M;Noriji N .Recent progress in catalytic technology in Japan[J].Applied Catalysis,1990,64:1. |
| [5] | Jianxin M;Yuichi K;Toshio O .Alkylation of 1,3,5-trimethylbenzene with γ-butyrolactone over heteropolyacid catalysts[J].Applied Catalysis A-general,2003,255(02):337. |
| [6] | Pankaj S;Samir V;Anjali P .Heteropolyacid supported onto neutral alumina:characterization and esterification of 1 and 2 alcohol[J].J Molec Catal A,214(02):281. |
| [7] | Kozhevnikov I V;Matveev K I .Homogeneous catalysts based on heteropoly acids (review)[J].Applied Catalysis,1983,5:135. |
| [8] | Hu C;Zhang Y;Xu L;Peng G .Continuous syntheses of octyl phenol or nonane phenol on supported heteropoly acid catalysts[J].Applied Catalysis,1999,177(02):237. |
| [9] | A.V.Ivanov;T.V.Vasina;V.D.Nissenbaum;L.M.Kustov;M.N.Timofeeva;J.I.Ho9uzvicka .Isomerization of n-hexane on the Pt-promoted keggin and Dawson tungstophosphoric heteropoly acids supportedon zirconia[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2004(1):65-72. |
| [10] | Loader C E;Anderson H J.Pyrrole chemistry part ⅩⅩ:synthesis of pyrrole acetals[J].Synthesis,1978(03):295. |
| [11] | Dhrubojyoti D L;Dipak P;Jajir S S .Cadmium iodide catalyzed and efficient synthesis of acetals under microwave irradiations[J].Chemistry Letters,1999,332(08):1283. |
| [12] | Zhang K Q;Sun B G.Synthesis of benzaldehyde-hexyl-mercaptan[J].CHEMISTRY WORLD,1999(01):37. |
| [13] | Luo Y M;Yang S J .Synthesis of ethyl acetoacetate 1,22 propanediol ketal catalyzed with phosphotungstic acid[J].Rare Met,2004,28(04):787. |
| [14] | Yadav G D;Bokade V V .Novelties of heteropoly acid supported on clay:etherification of phenethyl alcohol with alkanols[J].Applied Catalysis A-general,1996,147(02):299. |
| [15] | Okuhara T;Mizuno N;Misono M .IR spectrum study of heteropolyacid[J].Advance in Catalysis,1996,41:113. |
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