Preparation of Ni/bentonite catalyst and its applications in the catalytic hydrogenation of nitrobenzene to aniline
Preparation of Ni/bentonite catalyst and its applications in the catalytic hydrogenation of nitrobenzene to aniline
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Ni/膨润土催化剂的制备及其在硝基苯催化加氢制苯胺中的应用
DOI：
10.1016/j.cjche.2016.04.030
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发表时间：
2016-09-01
影响因子：
3.8
通讯作者：
Ji, Hongbing
中科院分区：
文献类型：
--
作者：
Jiang, Yuexiu;Li, Xiliang;Ji, Hongbing
采用浸渍法制备了不同镍含量的膨润土负载镍，应用于固定床反应器中硝基苯加氢制苯胺，并通过X射线衍射(XRD)、H-2-程序升温还原(H-2-TPR)和X射线光电子能谱(XPS)对其进行了表征。结果表明，与其他催化剂相比，镍含量为20 wt%的Ni/膨润土催化剂提供了更高的硝基苯转化率和苯胺选择性。 NiO是催化剂活性组分的前驱体，Ni/膨润土-20催化剂上的小晶粒尺寸以及高度分散的NiO有助于提高催化性能。硝基苯的氢化反应在Ni/bentonite-20上于300℃下进行，H-2气态时空速为4800ml.(g cat)(-1).h(-1)，硝基苯液态时空速为4.8ml.(g cat)(-1).h(-1)。硝基苯转化率为95.7%，苯胺选择性为98.8%。当硝基苯液时空速为4.8ml.(g cat)(-1).h(-1)时，10小时反应期间苯胺收率大于95.0％。 (C) 2016 中国化学工业工程学会，化学工业出版社。版权所有。
Ni supported on bentonite was prepared by the impregnation method with different nickel contents, applied to the hydrogenation of nitrobenzene to aniline in a fixed-bed reactor, and it was characterized by X-ray diffraction (XRD), H-2-temperature programmed reduction (H-2-TPR), and X-ray photoelectron spectrometry (XPS). The results showed that Ni/bentonite catalyst with 20 wt% nickel content provided a higher conversion of nitrobenzene and selectivity of aniline compared to other catalysts. NiO was the precursor of the active component of the catalyst, and the small crystallite size aswell as the highly dispersed NiO on the Ni/bentonite-20 catalyst, contributed to the catalytic performance. The hydrogenation of nitrobenzene was carried out at 300 degrees C with a H-2 gaseous hourly space velocity of 4800 ml.(g cat)(-1).h(-1) and a nitrobenzene liquid hourly space velocity of 4.8 ml.(g cat)(-1).h(-1) over Ni/bentonite-20. A 95.7% nitrobenzene conversion and 98.8% aniline selectivity were obtained. While the nitrobenzene liquid hourly space velocity was 4.8 ml.(g cat)(-1).h(-1), the yield of aniline was more than 95.0% during a 10-hour reaction. (C) 2016 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.