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采用浸渍法制备了一系列Pt/Ru质量比不同的Fe3O4修饰的Pt-Ru/Fe3O4/C催化剂,运用透射电镜(TEM)、能量弥散X射线谱(EDX)、X射线光电子能谱(XPS)、X射线粉末衍射(XRD)等手段对Pt-Ru/Fe3O4/C一系列催化剂进行了表征,并考察了Pt/Ru质量比不同对催化剂Pt-Ru/Fe3O4/C在无溶剂条件下催化邻氯硝基苯(o-CNB)选择性加氢制备邻氯苯胺(o-CAN)催化性能的影响.研究结果表明,催化剂的催化活性和对目标产物的选择性跟活性组分Pt、Ru比例有关.随着Pt/Ru比例的减小,目标产物o-CAN的选择性有所升高,然而反应物o-CNB的转化率有所下降.当Pt/Ru的质量比为2时,o-CNB的转化率降为76.5%,而目标产物o-CAN的选择性仍然为100%.与此同时,我们还对Pt-Ru/Fe3O4/C催化剂高的催化活性和目标产物的高选择性可能的原因进行了分析.
A series of Pt-Ru / Fe3O4 / C catalysts with different Pt / Ru mass ratios were prepared by impregnation method. TEM, XRD, XPS, , X-ray powder diffraction (XRD) and other means of Pt-Ru / Fe3O4 / C series of catalysts were characterized and investigated the Pt / Ru mass ratio of the catalyst Pt-Ru / Fe3O4 / C under solvent- Chloronitrobenzene (o-CNB) selective hydrogenation o-CAN (o-CAN) catalytic performance of the research results show that the catalytic activity of the catalyst and the selectivity of the target product with the active component Pt, Ru ratio .With the decrease of Pt / Ru ratio, the selectivity of the target product o-CAN increased, but the conversion of the reactant o-CNB decreased.When the mass ratio of Pt / Ru was 2, o The conversion of -CNB was reduced to 76.5%, while the selectivity of o-CAN was still 100% .At the same time, we also studied the high catalytic activity of Pt-Ru / Fe3O4 / C catalyst and the high selectivity of the target product The possible causes were analyzed.