多金属氧酸盐催化苯甲醇的选择性氧化：一个绿色可循环的高效催化氧化体系

以Keggin结构的几类杂多酸和三乙胺（TEA）为原料，通过简单的酸碱反应合成了相应杂多酸的TEA盐。 并以它们作为催化剂，30％H2O2作氧化剂，在不使用长链相转移剂的条件下，研究了它们催化苯甲醇选择氧化制备苯甲醛的反应性能。 结果表明，该类催化剂在苯甲醇的选择氧化反应中具有比相应杂多酸更高的催化活性或选择性。 其中TEAH]H2PW12O40为最佳催化剂，在适宜的反应条件下，该催化剂上苯甲醇转化率可达99.5％以上，苯甲醛选择性达~100％。 催化剂可以被分离和循环使用多次，活性、选择性基本不变。 用水作溶剂，避免了有机溶剂的使用，是一个高效、绿色的苯甲醛选择氧化体系。

Selective Oxidation of Benzyl Alcohol Catalyzed by Polyoxometalates:A Green Recyclable Catalytic System with High Performance

Several triethylamine(TEA) salts of heteropolyacids were synthesized by acid base reaction using Keggin-type heteropolyacids and TEA as raw materials. These salts were used to catalyze the oxidation of benzyl alcohol to benzaldehyde in water with 30% aqueous hydrogen peroxide as oxidant without employment of phase transfer catalyst with long chain. These salts possess higher catalytic activities or selectivities than the corresponding acids. TEAH]H2PW12O40 exhibits the best performance of all catalysts. Under the optimum reaction conditions, the conversion of benzyl alcohol and the selectivity of benzaldehyde is over 99.5% and ~100%, respectively, over TEAH]H2PW12O40. After the reaction, the catalyst can be isolated and used for next oxidation cycle, and the activity and selectivity are maintained in recycle. In view of the fact that water is used as reaction medium instead of organic solvent, this system is effective and green for selective oxidation of benzyl alcohol.