The studies on the Friedel–Crafts acylation of toluene with acetic anhydride over HPW/TiO2
The studies on the Friedel–Crafts acylation of toluene with acetic anhydride over HPW/TiO2
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DOI：
10.1016/j.fuproc.2011.05.026
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发表时间：
2011-10
影响因子：
7.5
通讯作者：
K. Su;Zhenhua Li;B. Cheng;Lei Zhang;Maliang Zhang;Jun Ming
中科院分区：
文献类型：
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作者：
K. Su;Zhenhua Li;B. Cheng;Lei Zhang;Maliang Zhang;Jun Ming
以HPW(H3PW12O40)/TiO2为催化剂，甲苯和乙酸酐为原料合成对甲基苯乙酮，并用BET、X射线衍射和NH3-TPD对催化剂进行了表征。表征结果表明，HPW与TiO2之间的相互作用阻止了HPW中酸性质子的流失，形成了HPW/TiO2催化剂上的弱Lewis酸中心。当HPW负载量较大或HPW/TiO2在高温下焙烧时，会形成HPW/TiO2上的弱酸中心。反应结果表明，对甲基苯酚的产率和选择性与催化剂的酸性有关，HPW/TiO2催化剂上弱Lewis酸中心的出现导致了对甲基苯酚的产率下降。
P-methyl acetephenone synthesis from toluene and acetic anhydride over HPW(H3PW12O40)/TiO2was carefully studied, and catalysts were characterized by BET, XRD and NH3-TPD. The characterized results displayed that the interaction between HPW and TiO2prevented the loss of acidic protons from HPW to form the weak Lewis acid sites over HPW/TiO2. The weak acid sites over HPW/TiO2came into being in case of much more HPW being loaded onto TiO2or HPW/TiO2being calcined at high temperature. The reaction results suggest that p-methyl acetephenone yield and selectivity depended on the acidity of catalysts, and the appearance of weak Lewis acid sites over HPW/TiO2resulted in p-methyl acetephenone yield decline.