State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, Jilin, China.
Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA.
Angew Chem Int Ed Engl. 2016 Mar 24;55(14):4542-6. doi: 10.1002/anie.201600625. Epub 2016 Mar 7.
Pd@CeO2 core-shell nanostructures with a tunable Pd core size, shape, and nanostructure as well as a tunable CeO2 sheath thickness were obtained by a biomolecule-assisted method. The synthetic process is simple and green, as it involves only the heating of a mixture of Ce(NO3 )3 , l-arginine, and preformed Pd seeds in water without additives. Importantly, the synthesis is free of thiol groups and halide ions, thus providing a possible solution to the problem of secondary pollution by Pd nanoparticles in the sheath-coating process. The Pd/CeO2 nanostructures can be composited well with γ-Al2 O3 to create a heterogeneous catalyst. In subsequent tests of catalytic NO reduction by CO, Pd@CeO2 /Al2 O3 samples based on Pd cubes (6, 10, and 18 nm), Pd octahedra (6 nm), and Pd cuboctahedra (9 nm) as well as a simply loaded Pd cube (6 nm)-CeO2 /Al2 O3 sample were used as catalysts to investigate the effects of the Pd core size and shape and the hybrid nanostructure on the catalytic performance.
采用生物分子辅助法制备了具有可调钯核尺寸、形状和纳米结构以及可调氧化铈壳层厚度的 Pd@CeO2 核壳纳米结构。该合成工艺简单环保，仅涉及 Ce(NO3 )3 、l-精氨酸和预形成的 Pd 种子在水中的混合物加热，无需添加物。重要的是，合成过程中不含巯基和卤化物离子，从而为解决壳层涂覆过程中钯纳米粒子的二次污染问题提供了一种可能的解决方案。Pd/CeO2 纳米结构可以很好地与 γ-Al2 O3 复合，形成异质催化剂。在随后的 CO 催化还原 NO 测试中，以 Pd 立方体（6、10 和 18nm）、Pd 八面体（6nm）和 Pd 立方面心十二面体（9nm）为 Pd 核以及负载简单 Pd 立方体（6nm）-CeO2 /Al2 O3 样品为催化剂，考察了 Pd 核尺寸和形状以及杂化纳米结构对催化性能的影响。
