Pd-Ni/Al2O3催化合成四甲基二丙烯三胺研究 Pd-Ni/Al2O3 Catalyze Synthesis of 3,3’-Iminobis(N,N-dimethylpropylamine)

Abstract

本研究采用浸渍法制作了一系列的以γ-Al2O3为载体的Pd-Ni双金属纳米催化剂(Pd-Ni(x: y)/Al2O3；x和y分别是Pd-Ni的摩尔比)，该催化剂用于二甲基丙二胺和二甲氨基丙腈加氢合成四甲基二丙烯三胺。并使用X射线衍射(XRD)、X电子光谱法(XPS)和透射电子显微镜法(TEM)对催化剂进行了表征。催化剂的活性随着Pd-Ni负载量的不同而变化。在所有催化剂中Pd-Ni/γ-Al2O3 (Pd:Ni = 1:2)表现出了最佳的催化活性，转化率在30%~40%，选择性达到90% (120˚C, 最初氢气压力2 MPa, 8 h)。 Several γ-Al2O3 supported Pd-Ni bimetallic nanocatalysts (Pd-Ni(x:y)/Al2O3; where x and y repre-sent the mass ratio of Pd and Ni, respectively) were prepared by the impregnation method and used for selective hydrogenation of N,N-Dimethyl-1,3-propane diamine and Dimethylaminopropionitrile to 3,3’-iminobis(N,N-dimethylpropylamine). The Pd-Ni/Al2O3 samples were confirmed to have generated Pd-Ni bimetallic nanoparticles by X-ray diffraction (XRD), X-ray photoelectron spec-troscopy (XPS) and transmission electron microscopy (TEM). The catalytic activity was assessed in view of the effects of different mass ratios of Pd and Ni. Among all the samples, the Pd-Ni (1:2)/Al2O3 (PN-1:1) catalyst showed extremely high catalytic ability, which had 30% - 40% conversion rate and 90% selectivity (120˚C, 2 MPa initial H2 pressure, 8 h).