采用溶胶-凝胶法制备了一系列不同 Fe 含量的 MnOx-TiO2催化剂,使用氢气程序升温还原(H2-TPR)、X射线光电子能谱(XPS)、比表面积测定(BET)和X射线衍射(XRD)等技术对其进行了表征,考察了该类催化剂催化燃烧氯苯(CB)的活性和稳定性。催化活性测试结果表明,Fe 的添加改善了MnOx-TiO2催化剂的活性,同时显著提高了该催化剂的稳定性。表征结果表明,适量 FeOx 的添加能明显提高催化剂的比表面积,促进了各活性组分的分散,提高了催化剂表面活性氧物种和晶格氧的数量,使催化剂表面的氧化能力大幅度提高,从而提高了 FeOx-MnOx-TiO2催化剂的活性和稳定性。
In this study,a series of MnOx-TiO2 and FeOx-MnOx-TiO2 catalysts were prepared using a sol-gel method and were investigated for the catalytic combustion of chlorobenzene (CB).The result revealed that FeOx-MnOx-TiO2 catalysts exhibited a relatively higher catalytic activity than that of MnOx-TiO2 catalysts. Moreover,a remarkably higher stability was detected for the FeOx-MnOx-TiO2 samples compared with Mn-Ti catalysts,indicating that the stability of MnOx-TiO2 samples could be enhanced by the addition of Fe.The syn-thetized catalysts were characterized using H2 temperature-programmed reduction(H2-TPR),X-ray photoelec-tron spectroscopy(XPS),brunauer-emmett-teller(BET)surface measurement,and X-ray diffraction(XRD). Characterization of the catalysts revealed that the appropriate addition of FeOx to the MnOx-TiO2 catalysts would increase the specific surface area of the catalysts,which promotes the dispersion of Mn species over the TiO2 supports.In addition,the introduction of Mn also increases the amount of active oxygen species on the catalyst surface and lattice oxygen,which would in turn significantly enhance the oxidation abilities of catalysts. All of above reasons account for the higher catalytic activity and stabilities of FeOx-MnOx-TiO2 catalysts.
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