Formation and Characterization of PdZn Alloy: A Very Selective Catalyst for Alkyne Semihydrogenation

被引：153

作者：

Tew, Min Wei ^{[1
]}

Emerich, Herman ^{[2
]}

van Bokhoven, Jeroen A. ^{[1
,3
]}

机构：

[1] ETH, Inst Chem & Bioengn, CH-8093 Zurich, Switzerland

[2] SNBL ESRF, F-38043 Grenoble, France

[3] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 17期

基金：

瑞士国家科学基金会;

关键词：

X-RAY-ABSORPTION; SUPPORTED PALLADIUM CATALYSTS; GALLIUM INTERMETALLIC COMPOUNDS; PD/ZNO CATALYSTS; SILICA CATALYST; IN-SITU; HYDROGENATION; ACETYLENE; SPECTROSCOPY; REDUCTION;

D O I：

10.1021/jp1103164

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：

The formation of a PdZn alloy from a 4.3% Pd/ZnO catalyst was characterized by combined in situ high-resolution X-ray diffraction (HRXRD) and X-ray absorption spectroscopy (XAS). Alloy formation started already at around 100 C, likely at the surface, and reached the bulk with increasing temperature. The structure of the catalyst was close to the bulk value of a 1:1 PdZn alloy with a L1(o) structure (RPd-Pd = 2.9 angstrom, RPd-zn = 2.6 angstrom, CNPd-zn= 8, CNPd-Pd =4) after reduction at 300 degrees C and above. The activity of the gas-phase hydrogenation of 1-pentyne decreased with the formation of the PdZn alloy. In contrast to Pd/SiO2, no full hydrogenation occurred over Pd/ZnO. Over time, only slight decomposition of the alloy occurred under reaction conditions.

引用

页码：8457 / 8465

页数：9

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