Synthesis and catalytic property of urania-palladium-graphene nanohybrids  

二氧化铀-钯-石墨烯纳米复合材料的合成及其催化4-硝基苯酚还原反应的研究（英文）

作　　者：丁莉 张则尧 李彦 

机构地区：[1]Beijing National Laboratory for Molecular Sciences, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials, Chemistry and Applications College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

出　　处：《Science China Materials》2017年第5期399-406,共8页中国科学（材料科学（英文版）

基　　金：supported by the Ministry of Science and Technology of China (2016YFA0201904);National Natural Science Foundation of China (21631002 and U1632119)

摘　　要：ABSTRACT Urania-paUadium-graphene nanohybrids were synthesized via a solvothermal process in ethylene glycol. With the solvothermal treatment, the Pd nanocrystals sur- rounded by well-crystallized urania supported on graphene oxide was obtained. This ternary hybrid showed consid- erably higher catalytic activity than palladium-graphene hybrids toward the reduction of 4-nitrophenol by NaBH4. Besides the smaller sizes of palladium nanoparticles in the ternary hybrids, in which the aggregation of Pd nanoparticles was prevented by urania, the charge transfer between the nano-structured Pd and urania may also contribute to the enhancement of catalytic activity by offering more active sites for adsorption and reaction.本文通过溶剂热方法合成了二氧化铀-钯-石墨烯纳米复合材料.在这种复合材料中,金属钯和二氧化铀的纳米晶负载在石墨烯氧化物上,且钯纳米晶与二氧化铀纳米晶密切接触.这一复合材料对4-硝基苯酚还原反应表现出良好的催化活性,二氧化铀在其中发挥了关键作用.二氧化铀有效地防止钯颗粒在溶剂热过程中团聚、长大;此外,在钯与二氧化铀界面处,电子从钯转移至二氧化铀表面,为催化还原反应提供了更多的吸附和反应位点,从而有效地提高了催化剂活性.

关 键 词：uranium oxides PALLADIUM catalytic performance 

分 类 号：O643.36[理学—物理化学] TB33[理学—化学]