负载型Pt/CeO_(2)催化剂对碘乙酸的催化加氢脱碘研究  

Study on catalytic hydrodeiodination of iodoacetic acid on CeO_(2) supported Pt catalyst

作　　者：林婧凌 李明会 万玉秋[1] 郑寿荣[1] LIN Jingling;LI Minghui;WAN Yuqiu;ZHENG Shourong(State Key Laboratory of Pollution Control and Resource Reuse Research,School of the Environment,Nanjing University,Nanjing,210023,China)

机构地区：[1]污染控制与资源化研究国家重点实验室南京大学环境学院,南京210023

出　　处：《环境化学》2022年第8期2488-2495,共8页Environmental Chemistry

基　　金：国家自然科学基金(21976086)资助。

摘　　要：采用硼氢化钠还原法制备了一系列不同载体(氧化铈、氧化铝、氧化硅和商用碳)的负载型Pt基催化剂.通过透射电子显微镜(TEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、电感耦合等离子体发射光谱(ICP-OES)等手段对催化剂的结构进行了详细表征,并对碘乙酸(MIAA)的液相催化加氢脱碘反应进行了研究.结果表明,Pt/CeO_(2)具有比其他催化剂高得多的MIAA催化加氢脱碘活性;Pt/CeO_(2)催化活性与溶液pH呈现先升后降的火山型变化,且随Pt负载量的增加而提高;MIAA的催化加氢脱碘反应符合朗格缪尔-欣谢尔伍德(Langmuir-Hinshelwood)模型,表明MIAA脱碘反应的速率控制步骤是污染物MIAA在催化剂表面的吸附过程;经4次循环使用后,Pt/CeO_(2)催化剂仍能去除93.4%的MIAA,具有较高的活性.The Pt catalysts supported on varied material(CeO_(2),Al_(2)O_(3),SiO_(2) and commercial C)were synthesized by the sodium borohydride reduction method.The structural properties of the catalysts were characterized in detail by TEM,XRD,XPS and ICP-OES,and their catalytic activities of liquid phase hydrodeiodination of iodoacetic acid(MIAA) were examined.The results showed that Pt/CeO_(2) had much higher MIAA catalytic hydrodeiodination activity than other catalysts.The initial activity of Pt/CeO_(2) showed an up-side down volcano-type dependency on pH,and enhanced with Pt loading amount.The catalytic hydrodeiodination reaction of MIAA conformed to the LangmuirHinshelwood model,which indicated that the adsorption of MIAA on the catalyst surface is the ratecontrolling step of this reaction.In addition,the Pt/CeO_(2) catalyst can still remove 93.4% of MIAA after 4 cycles of use,and exhibits high catalytic stability during catalyst reuse.

关 键 词：Pt/CeO_(2) 碘乙酸 液相催化加氢脱碘 硼氢化钠还原法 

分 类 号：O643.36[理学—物理化学]