Preparation, Characterization of Co/Mo/γ-Al2O3 Catalyst and Its Catalytic Performance in the Preparation of Phthalaldehyde

Abstract

本文以硝酸钴为钴源、钼酸铵为钼源，γ-Al2O3为载体，采用浸渍法得到一系列不同钴钼含量的Co/Mo/γ-Al2O3催化剂。采用热失重分析、扫描电镜、X射线衍射、NH3程序升温脱附、X射线光电子能谱及BET物理吸附等方法对样品进行了表征，并考察了催化剂在邻苯二甲醇过氧化氢氧化反应中的催化性能。结果表明，所制备的Co/Mo/γ-Al2O3具有较大的比表面积和孔径，有利于邻苯二甲醛的生成，可使目标产物获得较高转化率。 A series of Co/Mo/γ-Al2O3 with different cobalt and molybdenum loadings were synthesized under the impregnation method, using cobalt nitrate as the cobalt source and ammonium molybdate as the molybdenum source respectively. The catalyst samples were characterized by thermogravi-metric analysis, scanning electron microscope, X-ray diffraction, NH3 temperature programmed desorption, X-ray photoelectron spectroscopy and BET. The catalytic performance of the catalysts was evaluated for oxidation of 1,2-benzenedimethanol into phthalaldehyde by H2O2. The results show that the prepared catalysts have larger surface area and pore size, which was beneficial to the formation of phthalaldehyde, and could make the target product obtain high conversion rate.