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学科主题: 物理化学
题名: Catalytic Chemistry of the Nano-confined Systems
作者: Bao XH(包信和)
会议文集: Proceedings of AsiaNaon2010
会议名称: Asian Conference on Nanoscience and Nanotechnology 2010
会议日期: 2010-11-1
出版日期: 2011
会议地点: 东京
其他题名: 纳米限域体系的催化化学
通讯作者: 包信和
出版者: 待补充
出版地: 待补充
合作性质: 特邀报告
部门归属: 502
主办者: RIKEN Adnanced Science Institute
摘要: In the present talk, the unique characters of the catalysis with the nano-confined system will be demonstrated, and the emphasis will be laid on the differences of the electron properties, which derived from a so-called effect of the quantum well states in the 2D nano-systems and the effects of the interface confinement between the nano-islands and the surfaces of the substrates. The effect of electron quantum confinement on the catalytic activities of 2D ultra-thin metal films is explored by comparing the work function change and the initial reaction rate of atomically flat films of different thickness on silicon surfaces, using complementary microscopy and spectroscopy techniques. The obvious oscillations of the oxidation rate of lead films are observed, which are attributed to be a manifestation of the Fabry-Pe´rot interference modes of electron de Broglie waves (quantum well states) in the films. The modulation of the electron density of states near the Fermi level opens a new demission for tuning the catalytic performance of metal systems via size- and thickness-dependent quantum size effects, which will be illustrated through two examples. Coordinatively unsaturated ferrous (CUF) sites confined in nanosized matrices are active centers in a wide range of enzyme and homogeneous catalytic reactions. Preparation of the analogous active sites at supported catalysts is of great importance in heterogeneous catalysis but remains a challenge. On the basis of surface science measurements and density functional calculations, in the present talk, I will show that the interface confinement effect can be used to stabilize the CUF sites by taking advantage of strong adhesion between ferrous oxides and metal substrates. The interface-confined CUF sites together with the metal supports are active for dioxygen activation, producing reactive dissociated oxygen atoms. The structural ensemble was highly efficient for carbon monoxide oxidation at low temperature under typical operating conditions of a proton-exchange membrane fuel cell.
英文摘要: In the present talk, the unique characters of the catalysis with the nano-confined system will be demonstrated, and the emphasis will be laid on the differences of the electron properties, which derived from a so-called effect of the quantum well states in the 2D nano-systems and the effects of the interface confinement between the nano-islands and the surfaces of the substrates. The effect of electron quantum confinement on the catalytic activities of 2D ultra-thin metal films is explored by comparing the work function change and the initial reaction rate of atomically flat films of different thickness on silicon surfaces, using complementary microscopy and spectroscopy techniques. The obvious oscillations of the oxidation rate of lead films are observed, which are attributed to be a manifestation of the Fabry-Pe´rot interference modes of electron de Broglie waves (quantum well states) in the films. The modulation of the electron density of states near the Fermi level opens a new demission for tuning the catalytic performance of metal systems via size- and thickness-dependent quantum size effects, which will be illustrated through two examples. Coordinatively unsaturated ferrous (CUF) sites confined in nanosized matrices are active centers in a wide range of enzyme and homogeneous catalytic reactions. Preparation of the analogous active sites at supported catalysts is of great importance in heterogeneous catalysis but remains a challenge. On the basis of surface science measurements and density functional calculations, in the present talk, I will show that the interface confinement effect can be used to stabilize the CUF sites by taking advantage of strong adhesion between ferrous oxides and metal substrates. The interface-confined CUF sites together with the metal supports are active for dioxygen activation, producing reactive dissociated oxygen atoms. The structural ensemble was highly efficient for carbon monoxide oxidation at low temperature under typical operating conditions of a proton-exchange membrane fuel cell.
语种: 英语
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/115896
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Bao XH. Catalytic Chemistry of the Nano-confined Systems[C]. 见:Asian Conference on Nanoscience and Nanotechnology 2010. 东京. 2010-11-1.
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