IRAS and TPD study of adsorbed formic acid on Pt(110)-(1x2) surface

被引：24

作者：

Ohtani, T ^{[1
]}

Kubota, J ^{[1
]}

Wada, A ^{[1
]}

Kondo, JN ^{[1
]}

Domen, K ^{[1
]}

Hirose, C ^{[1
]}

机构：

[1] TOKYO INST TECHNOL,RESOURCES UTILIZAT RES LAB,MIDORI KU,YOKOHAMA,KANAGAWA 226,JAPAN

来源：

SURFACE SCIENCE | 1996年 / 368卷

关键词：

carboxylic acid; chemisorption; low index single crystal surfaces; metallic surfaces; platinum; reflection spectroscopy;

D O I：

10.1016/S0039-6028(96)01061-8

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 adsorption of formic acid on the Pt(110)-(1x2) surface was studied by infrared reflection absorption spectroscopy (IRAS) and temperature-programmed desorption (TPD). Formic acid dissociatively adsorbed to form bridging formate at low exposure and 140 K, giving IRAS peak at 2935, 1338 and 1321 cm(-1) assigned to the C-H stretching, C-H in-plane bending, and O-C-O symmetric stretching modes, respectively. On increasing the exposure, formic acid adsorbed on the formate-covered surface as a multilayer. Molecular adsorption of formic acid on the formate-covered surface reduced the intensities of the C-H stretching and C-H in-plane bending bands of formate. The adsorption temperature was an important factor for the crystalline structure of the multilayer of formic acid. Molecular adsorption of formic acid al 143 K produced structure of the a-form, while adsorption at lower temperature resulted in an amorphous phase.

引用

页码：270 / 274

页数：5