Formation and oxidation mechanisms of Pd-Zn nanoparticles on a ZnO supported Pd catalyst studied by in situ time-resolved QXAFS and DXAFS

被引：22

作者：

Uemura, Yohei ^{[1
,2
]}

Inada, Yasuhiro ^{[3
]}

Niwa, Yasuhiro ^{[1
]}

Kimura, Masao ^{[4
]}

Bando, Kyoko K. ^{[5
]}

Yagishita, Akira ^{[1
]}

Iwasawa, Yasuhiro ^{[6
]}

Nomura, Masaharu ^{[1
]}

机构：

[1] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan

[2] Univ Tokyo, Grad Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 1130033, Japan

[3] Ritsumeikan Univ, Coll Life Sci, Dept Appl Chem, Nojihigashi Kusatsu, Shiga 5258577, Japan

[4] Nippon Steel Corp Ltd, Adv Technol Res Labs, Futtsu, Chiba 2938511, Japan

[5] Natl Inst Adv Ind Sci & Technol, Res Ctr Compact Chem Proc, Tsukuba, Ibaraki 3058565, Japan

[6] Univ Electrocommun, Dept Engn Sci, Chofu, Tokyo 1828585, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2012年 / 14卷 / 07期

基金：

日本学术振兴会;

关键词：

ENERGY-DISPERSIVE XAFS; METHANOL DECOMPOSITION; REDUCTION PROCESSES; NO REDUCTION; FUEL-CELL; RH; PERFORMANCE; EXAFS; BEHAVIOR; TIO2;

D O I：

10.1039/c1cp22466b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Formation and oxidation processes of PdZn nanoparticles on ZnO were successfully observed by means of in situ time-resolved X-ray absorption fine structure spectroscopy (XAFS), and the analysis of data on near-edge (XANES) and extended (EXAFS) structures revealed detailed changes in Pd during both processes. PdZn nanoparticles were formed on ZnO through a two-step scheme under a hydrogen atmosphere. The first process was the formation of metallic Pd nanoparticles, which was quickly finished within 1 s. The second process was the formation of PdZn nanoparticles, which took several tens of minutes. Oxidation of the PdZn nanoparticles also consisted of two processes. Zn atoms were oxidized prior to Pd atoms and the metallic Pd nanoparticles surrounded by ZnO were formed afterwards. Oxidation of the metallic Pd nanoparticles was scarce and very slow. According to the results of kinetic analyses, the metallic Pd surrounded by ZnO was a stable species under the oxidative atmosphere.

引用

页码：2152 / 2158

页数：7

共 23 条

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