Facile immobilization of Ag nanoparticles on microchannel walls in microreactors for catalytic applications
Facile immobilization of Ag nanoparticles on microchannel walls in microreactors for catalytic applications
复制标题
轻松将银纳米颗粒固定在微反应器的微通道壁上，用于催化应用
DOI：
10.1016/j.cej.2016.10.038
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发表时间：
2017-02-01
影响因子：
15.1
通讯作者：
Chu, Liang-Yin
中科院分区：
文献类型：
--
作者：
Zhang, Lei;Liu, Zhuang;Chu, Liang-Yin
微反应器技术在多相催化反应中显示出巨大的潜力。然而，在微反应器中集成催化剂存在着操作繁琐、固定化不稳定、催化活性低等问题，限制了微反应器在催化领域的广泛应用。在此，提出了一种简单有效的策略，该策略利用聚多巴胺涂层的多功能粘附和还原性能，可以简单稳定地将银纳米颗粒（Ag NP）催化剂固定在玻璃微反应器中微通道的壁上。该方法具有化学稳定性和物理简单的优点。整个制造过程可以在温和的环境下轻松快速地进行。通过改变还原温度，可以简单地调节在微通道壁上形成银纳米颗粒。在4-硝基苯酚合成4-氨基苯酚的示范反应中，将纳米银固定在微通道壁上的微反应器在连续反应24 h的过程中表现出较高的催化活性和令人满意的稳定性，证实了纳米银的优异稳定性。本研究所提出的策略提供了一个简易的路线，制备金属纳米催化剂配备微反应器。(C)© 2016 Elsevier B. V.版权所有。
The microreactor technologies have shown great potential in heterogeneous catalysis reactions. Nevertheless, the integration of catalysts inside microreactors often suffer from several challenges such as troublesome procedure, instable immobilization and low catalytic activity thus limiting the wide utilization of microreactors in catalysis. Herein, a facile and efficient strategy, which is assisted with the versatile adhesion and reduction properties of polydopamine coating, has been proposed for simply and stably immobilizing catalysts of silver nanoparticles (Ag NPs) on the walls of microchannels in glass microreactors. The proposed approach is featured with the advantages of both chemical stability and physical simplicity. The whole fabrication procedure could be easily and quickly conducted under a mild environment. The formation of Ag NPs on the walls of microchannels could be simply tuned by varying the reduction temperature. In a demonstration reaction of 4-nitrophenol to 4-aminophenol, the microreactors immobilized with Ag NPs on the walls of microchannels show high catalytic activity and satisfactory stability during the continuous reaction for 24 h, which confirms the outstanding stability of the immobilized Ag NPs. The proposed strategy in this study provides a facile route for fabricating metallic nanocatalysts equipped microreactors. (C) 2016 Elsevier B.V. All rights reserved.