吲哚的直接气相合成:MgO助剂对Cu/SiO_2催化剂性能的影响

Direct Vapor-Phase Synthesis of Indole:Effect of MgO on the Performance of Cu/SiO_2 Catalyst

将MgO作为助剂用于苯胺和乙二醇直接气相合成吲哚Cu/SiO2催化剂中,通过X射线衍射、程序升温还原和热重分析对催化剂进行了表征.结果表明,适量(如0.17mmol/g)MgO的添加不仅提高了催化剂的活性,而且显著增强了催化剂的稳定性.加入的MgO可与CuO发生一定的相互作用,从而改善铜在二氧化硅表面上的分散,抑制铜在反应过程中的烧结.此外,MgO还减少了催化剂的积炭.

Magnesia was used as the promoter in the Cu/SiO2 catalyst for direct vapor-phase synthesis of indole from aniline and ethylene glycol. The catalyst was characterized by XRD, H2-TPR, and TG. The results showed that a suitable amount of MgO （i. e. , 0.17 mmol/g） remarkably increased the stability and activity of the catalyst. The MgO additive improved the dispersion of copper phases on the silica and prevented them from sintering in the reaction process. There existed an interaction between CuO and MgO, which inhibited the sintering of copper. The MgO promoter could suppress the coking of this copper-based catalyst.