Colloidally Prepared Pt Nanowires versus Impregnated Pt Nanoparticles: Comparison of Adsorption and Reaction Properties

被引：19

作者：

Haghofer, Andreas ^{[1
]}

Sonstroem, Patrick ^{[2
,3
]}

Fenske, Daniela ^{[4
,5
]}

Foettinger, Karin ^{[1
]}

Schwarz, Sabine ^{[6
]}

Bernardi, Johannes ^{[6
]}

Al-Shamery, Katharina ^{[4
,5
]}

Baeumer, Marcus ^{[2
,3
]}

Rupprechter, Guenther

机构：

[1] Vienna Univ Technol, Inst Mat Chem, A-1210 Vienna, Austria

[2] Univ Bremen, Inst Appl & Phys Chem, D-28357 Bremen, Germany

[3] Ctr Interface Sci, D-28357 Bremen, Germany

[4] Carl von Ossietzky Univ Oldenburg, Inst Pure & Appl Chem, D-26129 Oldenburg, Germany

[5] Ctr Interface Sci, D-26129 Oldenburg, Germany

[6] Vienna Univ Technol, USTEM, A-1040 Vienna, Austria

来源：

LANGMUIR | 2010年 / 26卷 / 21期

关键词：

SUM-FREQUENCY GENERATION; SCANNING-TUNNELING-MICROSCOPY; CARBON-MONOXIDE ADSORPTION; SURFACE VIBRATIONAL SPECTROSCOPY; CO OXIDATION; PLATINUM NANOPARTICLES; IN-SITU; INFRARED-SPECTROSCOPY; FTIR SPECTROSCOPY; HIGH-TEMPERATURES;

D O I：

10.1021/la1015912

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Ligand-capped Pt nanowires, prepared by colloidal synthesis and deposited on a high surface area gamma-Al2O3 support, were subjected to surface characterization by electron microscopy and FTIR spectroscopy using CO as a probe molecule. The structural, adsorption, and catalytic reaction properties of the colloidal Pt nanowires were compared to those of conventional, impregnated Pt nanoparticles on the same Al2O3 support. In situ FTIR spectroscopy indicated ligand effects on the CO resonance frequency, irreversible CO-induced surface roughening upon CO adsorption, and a higher resistance of colloidal catalysts toward oxidation (both in oxygen and during CO oxidation), suggesting that the organic ligands might protect the Pt surface. Elevated temperature induced a transformation of Pt nanowires to faceted Pt nanoparticles. The colloidal catalyst was active for hydrodechlorination of trichloroethylene (TCE), but no ligand effect on selectivity was obtained.

引用

页码：16330 / 16338

页数：9

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