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Cobalt Nanoparticles Encapsulated in Nitrogen-Doped Carbon Shells: Efficient and Stable Catalyst for Nitrobenzene Reduction
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-02-26 , DOI: 10.1021/acs.iecr.9b06604 Yan Xu 1 , Weixiang Shan 1 , Xiang Liang 1 , Xiaohui Gao 2 , Wenzhang Li 1 , Hongmei Li 2 , Xiaoqing Qiu 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-02-26 , DOI: 10.1021/acs.iecr.9b06604 Yan Xu 1 , Weixiang Shan 1 , Xiang Liang 1 , Xiaohui Gao 2 , Wenzhang Li 1 , Hongmei Li 2 , Xiaoqing Qiu 1
Affiliation
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In this work, cobalt [email protected] carbon nanocomposites ([email protected]) with controllable Co contents have been prepared by pyrolysis of Zn/Co bimetal zeolitic imidazolate framework-9 (Zn/Co-ZIF-9). The magnetic cobalt nanoparticles encapsulated by multilayered carbon shells are uniformly distributed on the NC substrates. The as-obtained [email protected] 45.8 wt % samples exhibit higher catalytic activity and stability for the heterogeneous catalytic reduction of nitrobenzene to anilines by NaBH4 under gentle condition. The reduction reaction over [email protected] 45.8 wt % catalysts accords with pseudo-first-order kinetics with an apparent rate constant of 0.844 min–1 and apparent activation energy of 14.20 kJ/mol at room temperature. Additionally, the related catalytic mechanism and reaction path have been fully explored and it has been found that the active hydrogen species induced by metallic cobalt nanoparticles, instead of the self-hydrolysis of NaBH4, accounts for the efficient reduction of nitrobenzene. Moreover, the [email protected] catalysts are greatly expedient for the separation and recycling from the reaction system due to its ferromagnetism, suggesting the promising application in the catalytic reduction reaction of nitrobenzene into anilines.
中文翻译：
氮掺杂碳壳中包裹的钴纳米粒子：高效，稳定的还原硝基苯的催化剂
在这项工作中，通过热解Zn / Co双金属沸石咪唑酸盐骨架9（Zn / Co-ZIF-9），制备了具有可控Co含量的钴[受电子邮件保护的]碳纳米复合材料（[受电子邮件保护的]）。被多层碳壳包封的磁性钴纳米颗粒均匀分布在NC基板上。所获得的[受电子邮件保护的] 45.8 wt％的样品在温和条件下对NaBH 4将硝基苯异质催化还原为苯胺显示出更高的催化活性和稳定性。在[电子邮件保护的] 45.8 wt％催化剂上的还原反应符合拟一级反应动力学，表观速率常数为0.844 min –1在室温下的表观活化能为14.20 kJ / mol。另外，已经充分探索了相关的催化机理和反应路径，并且已经发现由金属钴纳米颗粒诱导的活性氢物种代替了NaBH 4的自水解而不是有效地还原了硝基苯。而且，[电子邮件保护的]催化剂由于其铁磁性而非常适于从反应体系中分离和再循环，这表明在将硝基苯催化还原成苯胺中有希望的应用。
更新日期：2020-02-27
中文翻译：
氮掺杂碳壳中包裹的钴纳米粒子：高效，稳定的还原硝基苯的催化剂
在这项工作中，通过热解Zn / Co双金属沸石咪唑酸盐骨架9（Zn / Co-ZIF-9），制备了具有可控Co含量的钴[受电子邮件保护的]碳纳米复合材料（[受电子邮件保护的]）。被多层碳壳包封的磁性钴纳米颗粒均匀分布在NC基板上。所获得的[受电子邮件保护的] 45.8 wt％的样品在温和条件下对NaBH 4将硝基苯异质催化还原为苯胺显示出更高的催化活性和稳定性。在[电子邮件保护的] 45.8 wt％催化剂上的还原反应符合拟一级反应动力学，表观速率常数为0.844 min –1在室温下的表观活化能为14.20 kJ / mol。另外，已经充分探索了相关的催化机理和反应路径，并且已经发现由金属钴纳米颗粒诱导的活性氢物种代替了NaBH 4的自水解而不是有效地还原了硝基苯。而且，[电子邮件保护的]催化剂由于其铁磁性而非常适于从反应体系中分离和再循环，这表明在将硝基苯催化还原成苯胺中有希望的应用。
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