负载型杂多酸催化剂的制备及其对催化合成乙酸异丙酯的性能研究

The Preparation of Supported Heteropoly Acids Catalyst and its Catalytic Performance Studies for Synthesis of Isopropyl Acetate

采用热回流浸渍法将Keggin型12-磷钨杂多酸负载到改性高岭土上,并利用X射线衍射(XRD)、傅立叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)等手段对催化剂进行了表征。考察了负载型磷钨杂多酸催化剂对乙酸、异丙醇催化合成乙酸异丙酯的最佳反应条件。结果表明:改性高岭土有助于磷钨酸更好的分散,负载后磷钨杂多酸的Keggin结构并未遭到破坏。所制备的催化剂对乙酸和异丙醇合成乙酸异丙酯的酯化反应具有很好的催化选择性。

12 - P - W heteropoly acid supported on modified kaolin was prepared by the heat reflux impregnated method. The structure of the catalyst was characterized by using several techniques of X - ray diffraction （XRD） , Fourier transform infrared （FT- IR） spectroscopy and scanning electron microscopy （SEM）. Meanwhile the reaction conditions on the activity of P - W heteropoly acid supported were optimized as catalyst for synthesis of isopropyl ace- tate by acetic acid and isopropyl alcohol. The analysis results indicated that the prepared catalyst was effective for the esterification reaction of acetic acid with isopropyl alcohol. Modified kaolin can promote 12 -P -W heteropoly acid better dispersion and its Keggin structuye has not destroyed. The preparation of the catalyst for acetic acid and isopropyl alcohol synthesis isopropyl acetate esterification reaction has the very ~ood catalytic selectivitv.