| Ag/MIL-101催化剂还原对硝基苯酚反应动力学 |
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| 引用本文： | 秦凤祥,李凭力,黄益平,徐义明,陆晓咏,刘春江. Ag/MIL-101催化剂还原对硝基苯酚反应动力学[J]. 化工进展, 2016, 35(Z2): 168-173. DOI: 10.16085/j.issn.1000-6613.2016.s2.028 |
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| 作者姓名： | 秦凤祥 李凭力 黄益平 徐义明 陆晓咏 刘春江 |
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| 作者单位： | 1. 天津大学化工学院, 天津 300072;2. 中建安装工程有限公司, 江苏 南京 210023 |
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| 摘 要： | 采用双溶剂浸渍法制备得到了粒径为1.9nm±0.6nm高分散性的Ag/MIL-101催化剂。考察了该催化剂在过量NaBH4存在下，还原对硝基苯酚生成对氨基苯酚反应中的催化性能。本文通过研究催化剂浓度、底物浓度和温度对催化活性的影响，获得不同条件下的表观反应速率常数kapp，采用Langmuir-Hinshelwood吸附反应模型对所得动力学数据进行拟合，获得本征反应速率常数k，底物吸附常数K4-NP和KBH4，底物吸附焓、熵以及真实活化能EA，k等热力学参数。研究表明，诱导时间t0直接与该反应速率控制步骤的反应速率常数k有关。
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| 关 键 词： | 催化剂载体 纳米粒子 反应动力学 催化机理 |
| 收稿时间： | 2016-04-21 |
Kinetic analysis of catalytic reduction of 4-nitrophenol by Ag/MIL-101 |
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| QIN Fengxiang,LI Pingli,HUANG Yiping,XU Yiming,LU Xiaoyong,LIU Chunjiang. Kinetic analysis of catalytic reduction of 4-nitrophenol by Ag/MIL-101[J]. Chemical Industry and Engineering Progress, 2016, 35(Z2): 168-173. DOI: 10.16085/j.issn.1000-6613.2016.s2.028 |
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| Authors: | QIN Fengxiang LI Pingli HUANG Yiping XU Yiming LU Xiaoyong LIU Chunjiang |
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| Affiliation: | 1. School of Chemical Engineering, Tianjin University, Tianjin 300072, China;2. China Construction Installation Engineering Co., Ltd., Nanjing 210023, Jiangsu, China |
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| Abstract: | Highly dispersed and ultrafine Ag/MIL-101 was prepared by double solvent method(DSM).The size of the nanoparticles was about 1.9nm±0.6nm and the total surface area of nanoparticles could be determined precisely.The catalytic activity was investigated by photo-metrically monitoring the reduction of 4-nitrophenol(4-NP) by an excess of NaBH4 in the presence of the nanoparticles.The kinetic data could be modelled to the Langmuir-Hinshelwood equation.The apparent reaction rate,kapp was found to be related to the total surface of the nanoparticles,to the kinetic constant,k,related to the rate-determining step,and to the adsorption constants K4-NP and KBH4 for 4-NP and borohydride,respectively.The activation energy was obtained by fitting kapp obtained at different temperatures.The study also showed that the induction time,t0,is directly related to the reaction rate constant,k,of the controlling step. |
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| Keywords: | catalyst support nanoparticles reaction kinetics catalytic mechanism |
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