Water-Gas Shift Reaction on Metal Nanoclusters Encapsulated in Mesoporous Ceria Studied with Ambient-Pressure X-ray Photoelectron Spectroscopy

被引：99

作者：

Wen, Cun ^{[1
]}

Zhu, Yuan ^{[1
]}

Ye, Yingchun ^{[1
]}

Zhang, Shiran ^{[1
]}

Cheng, Fang ^{[1
]}

Liu, Yi ^{[1
]}

Wang, Paul ^{[2
]}

Tao, Franklin ^{[1
]}

机构：

[1] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA

[2] Bradley Univ, Dept Phys, Peoria, IL 61625 USA

来源：

ACS NANO | 2012年 / 6卷 / 10期

基金：

美国国家科学基金会;

关键词：

catalysis; water-gas shift; ambient-pressure X-ray photoelectron spectroscopy; ceria; in situ; SURFACE SCIENCE; IN-SITU; CATALYSTS; NANOPARTICLES; CRYSTAL; CONFINEMENT; FRAMEWORKS; CHEMISTRY; MECHANISM; SUPPORTS;

D O I：

10.1021/nn303901q

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Metal nanoclusters (Au, Pt, Pd, Cu) encapsulated in channels of mesoporous ceria (mp-CeO2) were synthesized. The activation energies of water-gas shift (WGS) reaction performed at oxide metal interfaces of metal nanoclusters encapsulated in mp-CeO2(M@mp-CeO2) are lower than those of metal nanoclusters impregnated on ceria nanorods (M/rod-CeO2). in situ studies using ambient-pressure XPS (AP-XPS) suggested that the surface chemistry of the internal concave surface of CeO2 pores of M@mp-CeO2 is different from that of external surfaces of CeO2 of M/rod-CeO2 under reaction conditions. AP-XPS identified the metallic state of the metal nanoclusters of these WGS catalysts (M@mp-CeO2 and M/rod-CeO2) under a WGS reaction condition. The lower activation energy of M@mp-CeO2 in contrast to M/rod-CeO2 is related to the different surface chemistry of the two types of CeO2 under the same reaction condition.

引用

页码：9305 / 9313

页数：9

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