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固载化杂多酸钴盐催化氧化甲苯制备苯甲醛

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Abstract:

以酸活化的凹凸棒石(palygorskite,Pa)为载体,采用化学键合的方法制备了3-氨丙基三乙氧基硅烷(3-aminopropyl-triethoxysilane,APTES)硅烷化凹凸棒石(PaAPTES)负载的Keggin型杂多酸钴盐催化剂(Co4H1PV2Mo10O40/PaAPTES),并用红外光谱分析、X射线衍射、比Brunauer-Emmett-Teller(BET)表面积测定等对催化剂进行了表征。进行了催化氧化甲苯制苯甲醛的反应实验。结果表明在采用Co4H1PV2Mo10O40/PaAPTES进行的催化反应中,苯甲醛是主要的生成产物。当乙腈为溶剂,催化剂的用量为0.3g,9.6mL双氧水(H2O2在溶液中体积含量为50%),在90℃反应9h,得到甲苯转化率为58%,苯甲醛的选择性达到75%。且催化剂便于从反应体系中分离。

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