Diffuse reflectance IR study of noble metals supported on basic carriers. Part I: Pt supported on Al-Mg hydrotalcite

被引：27

作者：

Kazansky, VB

Borovkov, VY

Serykh, AI

Figueras, F

机构：

[1] Russian Acad Sci, ND Zelinskii Organ Chem Inst, Moscow 117913, Russia

[2] Inst Rech Catalyse, CNRS, F-69626 Villeurbanne, France

来源：

CATALYSIS LETTERS | 1997年 / 49卷 / 1-2期

关键词：

supported Pt; hydrotalcites; adsorption of CO; adsorption of hydrogen; Pt hydrides; DRIR spectroscopy; sulfur modification;

D O I：

10.1023/A:1019032600282

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 state of metallic Pt supported on alumina-magnesia hydrotalcite was investigated using diffuse reflectance FT-IR spectra of adsorbed CO and terminal Pt hydrides formed upon hydrogen dissociative chemisorption on metal at room temperature. On hydrotalcite surface metallic Pt exists in three different forms, such as neutral and negatively charged metallic particles as well as slightly negatively charged clusters encapsulated between layers of support: Negative charging on Pt particles results in decrease of singleton frequency of linearly adsorbed CO by 70 cm(-1) and frequency of Pt-H bond vibration by 50-100 cm(-1). It was also established that negatively charged Pt is less sulfur resistant than neutral Pt particles.

引用

页码：35 / 41

页数：7

共 24 条

[1]

ALEKSEEV AA, 1981, DOKL AKAD NAUK SSSR, V246, P625

[2] FACTORS DETERMINING CO ADSORPTION SITES ON PD AND PT(100) AND PT(111) SURFACES - THEORETICAL-STUDY [J].