| Pd/CeO2催化水中溴酸盐的加氢还原研究 |
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| 引用本文： | 周娟,陈欢,李晓璐,万海勤,万玉秋,许昭怡.Pd/CeO2催化水中溴酸盐的加氢还原研究[J].中国环境科学,2011,31(8):1274-1279. |
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| 作者姓名： | 周娟 陈欢 李晓璐 万海勤 万玉秋 许昭怡 |
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| 作者单位： | 南京大学环境学院,污染控制与资源化研究国家重点实验室,江苏南京210046 |
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| 基金项目： | 国家自然科学基金资助项目(21077050); 江苏省自然科学基金资助项目(BK2010051); 科技部国际科技合作项目(2010DFA91910) |
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| 摘 要： | 采用溶胶-凝胶法制备了CeO2载体,以浸渍法和沉积沉淀法制备了负载型催化剂Pd/CeO2.使用透射电镜(TEM)和Zeta电位仪对催化剂进行了表征.结果表明两种材料的等电点都在5.0左右; Pd颗粒在载体表面具有良好的分散性,且Pd负载量越高,Pd颗粒的粒径越大.采用Pd/CeO2催化剂催化溴酸盐加氢还原,发现在溴酸盐初始浓度为0.39mmol/L时,采用沉积沉淀法和浸渍法合成的Pd/CeO2催化剂反应50min后对溴酸盐的去除率分别为100%和71%,表明使用沉积沉淀法合成的催化剂具有较高的催化活性.改变催化剂用量,溴酸盐的催化还原速率不受传质阻力的影响,反应过程符合Langmuir–Hinshelwood模型,即催化还原反应由溴酸盐在催化剂表面的吸附控制.增加Pd的负载量,溴酸盐的还原速率增大.溶液pH值较低时,有利于对溴酸盐的催化还原.
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| 关 键 词： | Pd/CeO2 沉积沉淀法 催化加氢 溴酸盐还原 |
| 收稿时间： | 2010-12-13; |
Study on liquid phase catalytic hydrogenation of bromate over Pd/CeO_2 catalyst |
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| ZHOU Juan,CHEN huan,LI Xiao-lu,WAN Hai-qin,WAN Yu-qiu,XU Zhao-yi.Study on liquid phase catalytic hydrogenation of bromate over Pd/CeO_2 catalyst[J].China Environmental Science,2011,31(8):1274-1279. |
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| Authors: | ZHOU Juan CHEN huan LI Xiao-lu WAN Hai-qin WAN Yu-qiu XU Zhao-yi |
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| Affiliation: | ZHOU Juan,CHEN huan,LI Xiao-lu,WAN Hai-qin,WAN Yu-qiu,XU Zhao-yi(State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing 210046,China) |
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| Abstract: | CeO2 carrier was synthesized via the sol-gel method,Pd/CeO2 catalysts were prepared using the deposition-precipitation and impregnation method.The catalysts were characterized by TEM and Zeta potential measurement.Results showed the isoelectric points(IEPs) of both catalysts were around 5.0,and metallic Pd particles were well dispersed on CeO2 surface,the average Pd particle sizes on the CeO2 surface grown with the increase of Pd loading amount.Bromate with an initial concentration of 0.39mmol/L was removed... |
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| Keywords: | Pd/CeO2 deposition-precipitation method catalytic hydrogenation bromate reduction |
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