In Situ Photoemission Observation of Catalytic CO Oxidation Reaction on Pd(110) under Near-Ambient Pressure Conditions: Evidence for the Langmuir-Hinshelwood Mechanism

被引：26

作者：

Toyoshima, Ryo ^{[1
]}

Yoshida, Masaaki ^{[1
]}

Monya, Yuji ^{[1
]}

Suzuki, Kazuma ^{[1
]}

Amemiya, Kenta ^{[2
]}

Mase, Kazuhiko ^{[2
]}

Mun, Bongjin Simon ^{[3
,4
]}

Kondoh, Hiroshi ^{[1
]}

机构：

[1] Keio Univ, Dept Chem, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan

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

[3] Gwangju Inst Sci & Technol, Dept Phys & Photon Sci, Kwangju 500712, South Korea

[4] Gwangju Inst Sci & Technol, Ertl Ctr Electrochem & Catalysis, Kwangju 500712, South Korea

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 40期

关键词：

ROOT-5)R27-DEGREES-O SURFACE OXIDE; LEVEL PHOTOEMISSION; ACTIVE SURFACES; PD(100); ADSORPTION; PALLADIUM; OXYGEN; RECONSTRUCTIONS; PT(110); XPS;

D O I：

10.1021/jp4054132

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：

CO oxidation reaction on a Pd(110) single crystal surface at various temperatures under near-ambient-pressure conditions has been investigated using in situ X-ray photoemission spectroscopy and mass spectroscopy. At lower temperature conditions, the CO2 formation rate is low, where the surface is covered by CO molecules (i.e., CO poisoning). Above a critical temperature 165 degrees C the Pd(110) surface converts to a catalytically active surface and is dominated by chemisorbed oxygen species. Further at the higher temperatures up to 320 degrees C, the CO2 formation rate is gradually decreased to about 80% of the maximum rate. At this moment, the amount of chemisorbed O was also decreased, which suggests that the CO oxidation reaction proceeds via the conventional Langmuir-Hinshelwood mechanism even under near-ambient pressure conditions.

引用

页码：20617 / 20624

页数：8

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