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钯蜂窝催化剂用于硝基苯气液固三相加氢反应
1.中国科学院大连化学物理研究所,辽宁 大连 116023;2.中国科学院大学,北京 100039
Three-Phase Hydrogenation of Nitrobenzene to Aniline over Monolith Palladium Supported Catalyst
1. Dalian Institute of Chemical Physics, Dalian 116023, China; 2. University of Chinese Academy of Sciences, Beijing 100039, China
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摘要 以Pd/Al2O3/堇青石为催化剂,硝基苯与氢气为原料,系统地考察了氧化铝涂层的上载量、氢气流速、反应温度以及液体空速对硝基苯气液固三相加氢反应的影响规律。结果表明:较高的涂层上载量能产生较大的Pd颗粒,而在较大的Pd颗粒上反应的活性较高;氢气流速对反应并无明显的影响,表明反应器内的流型处于膜状流;反应的表观活化能为6.1 kJ/mol,显示外扩散过程对反应的影响很大;硝基苯转化率随着液体空速的增加而不断下降,通过计算不同液相空速时的总传质系数,并与硝基苯的转化率进行关联,发现总传质系数与硝基苯转化率呈良好的线性关系。
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杜宝磊1
2
苏宏久1
苏 敏1
2
王树东1
关键词 堇青石硝基苯加氢膜状流总传质系数    
Abstract:Three-phase hydrogenation of nitrobenzene was carried out in a continuous flow reactor. The effects of the layer loading, the H2 flow rate, the reaction temperature and the liquid hourly space velocity (LHSV) were investigated. It was observed that Pd dispersion decreased with the increase of layer loading, while a higher nitrobenzene activity was obtained over larger Pd particles; the conversion was not affected by gas flow rate, which showed that the flow pattern was in film flow regime; the apparent activation energy was 6.1 kJ/mol, indicating the external mass transfer couldn’t be neglected; the nitrobenzene conversion decreased with the increase of LHSV, and a good linear relationship between the conversion and the overall mass transfer coefficient was observed.
Key wordsmonolith    hydrogenation of nitrobenzene    film flow    mass transfer coefficient   
收稿日期: 2014-04-14     
基金资助:国家自然科学基金(21306184)。
作者简介: 杜宝磊(1986—),男,博士研究生;王树东(1965—),男,研究员,通讯联系人。E-mail: wangsd@dicp.ac.cn。
引用本文:   
杜宝磊1,2,苏宏久1等. 钯蜂窝催化剂用于硝基苯气液固三相加氢反应[J]. 化学反应工程与工艺, 2014, 30(6): 499-505.
Du Baolei1,2,Su Hongjiu1 et al. Three-Phase Hydrogenation of Nitrobenzene to Aniline over Monolith Palladium Supported Catalyst[J]. 化学反应工程与工艺, 2014, 30(6): 499-505.
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