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

[1] Formation of Supported Intermetallic Nanoparticles in the Pd-Zn/α-Al2O3 Catalyst
Mashkovsky, I. S.
Markov, P. V.
Bragina, G. O.
Baeva, G. N.
Bukhtiyarov, A. V.
Prosvirin, I. P.
Bukhtiyarov, V. I.
Stakheev, A. Yu.
KINETICS AND CATALYSIS, 2017, 58 (04) : 471 - 479
[2] In Situ Spectroscopy of Complex Surface Reactions on Supported Pd-Zn, Pd-Ga, and Pd(Pt)-Cu Nanoparticles
Foettinger, Karin
Rupprechter, Guenther
ACCOUNTS OF CHEMICAL RESEARCH, 2014, 47 (10) : 3071 - 3079
[3] In-situ time-resolved DXAFS and Raman spectroscopy for selective ethanol oxidation on supported vanadium catalysts
Tada, Mizuki
Ishiguro, Nozomu
Murakami, Daisuke
Iwasawa, Yasuhiro
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2010, 240
[4] Bimetallic Pd-Zn silica-supported catalyst for CO hydrogenation.: In situ DRIFT study
Araña, J
Homs, N
Sales, J
de la Piscina, PR
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2000, 164 (1-2) : 297 - 300
[5] Formation of sphalerite and wurtzite ZnO in Pd-Zn alloy after internal oxidation at elevated temperatures
Watanabe, Kei
Sakaguchi, Norihito
Watanabe, Seiichi
JOURNAL OF MATERIALS SCIENCE, 2011, 46 (13) : 4568 - 4573
[6] Thermal evolution of carbon-supported Pd nanoparticles studied by time-resolved X-ray diffraction
Canton, P
Meneghini, C
Riello, P
Balerna, A
Benedetti, A
JOURNAL OF PHYSICAL CHEMISTRY B, 2001, 105 (34): : 8088 - 8091
[7] Formation of supported intermetallic nanoparticles in the Pd–Zn/α-Al2O3 catalyst
I. S. Mashkovsky
P. V. Markov
G. O. Bragina
G. N. Baeva
A. V. Bukhtiyarov
I. P. Prosvirin
V. I. Bukhtiyarov
A. Yu. Stakheev
Kinetics and Catalysis, 2017, 58 : 471 - 479
[8] The CO oxidation kinetics on supported Pd model catalysts:: A molecular beam/in situ time-resolved infrared reflection absorption spectroscopy study
Libuda, J
Meusel, I
Hoffmann, J
Hartmann, J
Piccolo, L
Henry, CR
Freund, HJ
JOURNAL OF CHEMICAL PHYSICS, 2001, 114 (10): : 4669 - 4684
[9] Reversible Sulfidation of Pt0.3Pd0.7 Nanoparticles Investigated by in Situ Time-Resolved XAS
Boita, Jocenir
Bernardi, Fabiano
Castegnaro, Marcus Vinicius
Nicolao, Lucas
Alves, Maria C. M.
Morais, Jonder
JOURNAL OF PHYSICAL CHEMISTRY C, 2014, 118 (10): : 5538 - 5544
[10] In situ and time-resolved SAXS studies of Pd nanoparticle formation in a template of block copolymer microdomain structures
Sakamoto, N
Harada, M
Hashimoto, T
MACROMOLECULES, 2006, 39 (03) : 1116 - 1124

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