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文章编号: 16726987(2018)03001605; DOI: 10.16351/j.16726987.2018.03.002
兰丽娟1,2, 杜芳林1*
(1.青岛科技大学 材料科学与工程学院,山东 青岛 266042; 2.烟台大学 环境与材料工程学院,山东 烟台 264005)
摘要: 以氢气作为氢源,考察了Pd/CNTs对液相中的4卤代苯酚的催化加氢脱卤规律,反应活性顺序:4溴苯酚>4氯苯酚>4碘苯酚>4氟苯酚。分析了4碘苯酚加氢脱碘反应活性低的原因。预先进行4碘苯酚的吸附对反应是有利的,但反应过程中生成的I-对反应不利,原因在于其在催化剂表面具有强烈的吸附作用,导致催化剂活性降低。卤代苯酚的催化加氢脱卤反应速率控制步骤为氢活性中间体的生成。
关键词: Pd/CNTs; 催化加氢脱卤; 4卤代苯酚; 反应机理
中图分类号: X 703文献标志码: A
引用格式: 兰丽娟,杜芳林. Pd/CNTs对卤代苯酚的催化加氢脱卤机理\[J\]. 青岛科技大学学报(自然科学版), 2018, 39(3): 1620.
LAN Lijuan, DU Fanglin. Mechanism study on catalytic hydrodehalogenation of halogenated phenol over Pd/CNTs\[J\]. Journal of Qingdao University of Science and Technology(Natural Science Edition), 2018, 39(3): 1620.
Mechanism Study on Catalytic Hydrodehalogenation of
Halogenated Phenol Over Pd/CNTs
LAN Lijuan1,2, DU Fanglin1
(1.College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;
2.School of Environment and Materials Engineering, Yantai University, Yantai 264005, China)
Abstract: The catalytic hydrodehalogenation of 4halogenated phenol was investigated over Pd/CNTs by using hydrogen as hydrogen source. The reaction activity order was 4bromophenol>4chlorophenol>4iodophenol>4fluorophenol. The reason for the low reactivity of 4iodophenol hydrodeiodination was analyzed. The preadsorption of 4iodophenol was beneficial to the reaction, but the high adsorption of I- on the catalysts surface would result in the decline of the catalytic activity. The reaction rate control step was the formation of hydrogen active intermediates.
Key words: Pd/CNTs; catalytic hydrodehalogenation(HDH); 4halophenols; reaction mechanism
收稿日期: 20170301
基金项目: 国家自然科学基金项目(51272115).
作者简介: 兰丽娟(1974—),女,讲师.*通信联系人.