【摘要】 以乙醇和哌嗪催化胺化合成N-乙基哌嗪的反应为模型,对分子间醇的催化胺化反应进行了研究。制备了一系列的铜基催化剂用于此反应,筛选得到了Cu-Cr-Zn/γ-Al2O3催化剂,在最佳反应条件下,乙醇的转化率达93%,N-乙基哌嗪的选择性达90%以上;而且在100 h的寿命实验中,N-乙基哌嗪的选择性保持在86%以上。采用X射线衍射、X射线光电子能谱和程序升温还原等对催化剂进行了系列表征,提出单质铜最有可能是催化剂的活性中心,且活性组分锌的添加能够有效地分散催化剂表面的铜,从而提高了催化剂的活性和稳定性。更多还原

【Abstract】 The intermolecular catalytic amination of alcohols is examined by using the catalytic amination of ethanol with piperazine to N-ethylpiperazine as a model.A series of copper based catalysts are prepared and Cu-Cr-Zn/γ-Al₂O₃ is chosen as a catalyst finally.The conversion of ethanol is 93% and the selectivity of N-ethylpiperazine is over 90% under the optimal reaction conditions.The selectivity of N-ethylpiperazine remains over 86% during the 100-hour service life test.The catalysts are characterized by XRD,XPS and TPR.The Cu⁰ is believed to be the most likely the active site of the catalyst.The copper on the surface of the catalyst can be highly dispersed by the addition of zinc,which leads to the improvement of both the activity and the stabilityof the catalyst.更多还原