Acid-treated bentonite-supported Ni catalysts via rapid microwave-assisted drying for nitrobenzene hydrogenation
Acid-treated bentonite-supported Ni catalysts via rapid microwave-assisted drying for nitrobenzene hydrogenation
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酸处理膨润土负载镍催化剂通过快速微波辅助干燥用于硝基苯加氢
DOI：
10.1080/00986445.2017.1409737
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发表时间：
2018-02
影响因子：
2.5
通讯作者：
Hongbing Ji
中科院分区：
文献类型：
--
作者：
Yuexiu Jiang;Xiliang Li;Zuzeng Qin;Hongbing Ji
摘要采用微波干燥法制备了酸处理过的膨润土负载镍催化剂，并对其进行了表征，并将其用于硝基苯加氢制苯胺。微波辅助干燥使催化剂的干燥时间从传统加热方法的3 h缩短到10 m in；微波干燥后，酸处理的膨润土负载的镍催化剂比传统的干燥方法更稳定，这是因为酸处理的膨润土载体上的镍颗粒更小，金属镍的分散度更高，镍与酸处理的膨润土载体之间的相互作用更强。在300℃下，硝苯液时空速为3.6 m L g−1 h−1，氢气时空速为4 800 m L g−1 h−1的催化研究表明，采用微波加热法制备的催化剂在60 h的反应中保持了99.9%的转化率和93%的苯胺选择性。此外，用传统方法干燥的催化剂只能使用16 h。
ABSTRACT Acid-treated bentonite-supported Ni catalysts were prepared using a microwave-assisted drying process, characterized and used for the hydrogenation of nitrobenzene to aniline. Microwave-assisted drying of the catalyst reduced the drying time from 3 h with a traditional heating method to 10 min; after drying by microwave irradiation, the acid-treated bentonite-supported Ni catalysts were more stable due to a smaller crystallite size, a higher dispersion of metallic Ni and stronger interactions between Ni and the acid-treated bentonite support than the traditional drying method. Catalytic studies conducted at 300°C with a nitrobenzene liquid hourly space velocity of 3.6 mL g−1 h−1 and a H2 gas hourly space velocity of 4,800 mL g−1 h−1 indicated that the catalyst prepared using the microwave heating method maintained a nitrobenzene conversion of >99.9% with an aniline selectivity >93% during a 60-h reaction. In addition, the catalyst dried using a traditional method only functioned for 16 h.
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