Pt/Pd/Fe Trimetallic Nanoparticle Produced via Reverse Micelle Technique: Synthesis, Characterization, and Its Use as an Efficient Catalyst for Reductive Hydrodehalogenation of Aryl and Aliphatic Halides under Mild Conditions
Pt/Pd/Fe Trimetallic Nanoparticle Produced via Reverse Micelle Technique: Synthesis, Characterization, and Its Use as an Efficient Catalyst for Reductive Hydrodehalogenation of Aryl and Aliphatic Halides under Mild Conditions
复制标题
DOI：
10.1021/cs300507a
复制
发表时间：
2013-02-01
期刊：
影响因子：
12.9
通讯作者：
Balalaie, Saeed
中科院分区：
文献类型：
--
作者：
Abazari, Reza;Heshmatpour, Felora;Balalaie, Saeed
采用水/AOT/异辛烷的油包水型微乳液体系，在室温下制备了Pt/Pd/Fe三金属纳米粒子（Pt/Pd/Fe T-NP）。通过场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和X射线荧光（XRF）分析对该纳米粒子（NP）进行了物理表征。将该纳米粒子用于卤代有机物（HOCs）的加氢脱卤（HDH）反应，并将其催化氯苯加氢脱氯（HDC）的性能与同样方法制备的Pt/Pd、Pt/Fe和Pd/Fe纳米粒子（B-NPs）进行了比较。Pt/Pd/Fe混合系综的形成导致HDC反应的整体活性和可重复使用性的提高，与作为最佳B-NP的Pd/Fe催化剂相比。对氯苯的HDC进行了回收实验。以HDC的转化率最大为目标，对溶剂、催化剂和甲酸铵用量等反应参数进行了优化。结果表明，HOCs，包括吸电子和给电子底物，都得到了顺利的还原。最后提出了Pt/Pd/Fe催化剂表面HDH反应的机理。
The Pt/Pd/Fe trimetallic nanoparticle (Pt/Pd/Fe T-NP) was prepared using a water-in-oil microemulsion system of water/AOT/isooctane at room temperature. This nanoparticle (NP) was physically characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray fluorescence (XRF) analyses. The said NP was used as catalyst for hydrodehalogenation (HDH) of halogenated organic compounds (HOCs), and its capability in hydrodechlorination (HDC) of chlorobenzene was compared with Pt/Pd, Pt/Fe, and Pd/Fe bimetallic nanoparticles (B-NPs) synthesized via the same method. The formation of mixed Pt/Pd/Fe ensembles results in an enhanced overall activity and reusability of HDC reaction, compared with Pd/Fe catalyst which acted as the best B-NP. Recycling experiments were examined for HDC of chlorobenzene. To get a maximum conversion of HDC, the reaction parameters like the effect of solvent, amounts of catalyst and ammonium formate were optimized. According to the results, HOCs, including electron-withdrawing and electron-donating substrates, were reduced smoothly. Finally, a mechanism for HDH reaction on the Pt/Pd/Fe catalyst surface was proposed.