Effect of microstructures of Pt catalysts supported on carbon nanotubes (CNTs) and activated carbon (AC) for nitrobenzene hydrogenation
Effect of microstructures of Pt catalysts supported on carbon nanotubes (CNTs) and activated carbon (AC) for nitrobenzene hydrogenation
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DOI：
10.1016/j.matchemphys.2007.02.045
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发表时间：
2007-06
影响因子：
4.6
通讯作者：
Yun Zhao;Chunhua Li;Z. Yu;K. Yao;Sheng-fu Ji;Ji Liang
中科院分区：
文献类型：
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作者：
Yun Zhao;Chunhua Li;Z. Yu;K. Yao;Sheng-fu Ji;Ji Liang
制备了碳纳米管(CNTs)和活性碳(AC)负载的铂催化剂。用BET、TEM、XPS等技术对催化剂的结构进行了表征。考察了该催化剂对硝基苯加氢反应的催化性能。结果表明，碳纳米管的介孔织构使其外表面容易被铂离子吸附。因此，碳纳米管上的铂颗粒要小得多，而且合适的表面基团浓度使铂更容易被还原。AC表面的微孔织构使其上的PT颗粒较大，AC上的官能团较多，需要在较高温度下还原。铂/碳纳米管催化剂还原温度较低，表现出比铂/AC催化剂更高的硝基苯加氢活性。
Pt catalysts supported on carbon nanotubes (CNTs) and activated carbon (AC) were prepared. The structure of the catalysts was characterized using BET, TEM, XPS techniques. The catalytic performance for nitrobenzene hydrogenation was tested. The results show that the mesoporous textures of CNTs make the outer surfaces of CNTs accessible for Pt ion. So Pt particles on CNTs are much smaller, and the proper concentration of surface groups on CNTs makes Pt easy for reducibility. Pt particles on AC are larger due to the microporous texture, and reduction at higher temperature is necessary because of more functional groups on AC. The Pt/CNTs catalysts reduced at lower temperature, exhibit higher activity than the Pt/AC catalysts for nitrobenzene hydrogenation.