In situ FTIR studies of high-temperature adsorption of hydrogen on zirconia

被引：60

作者：

Trunschke, A ^{[1
]}

Hoang, DL ^{[1
]}

Lieske, H ^{[1
]}

机构：

[1] INST APPL CHEM,D-12484 BERLIN,GERMANY

来源：

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1995年 / 91卷 / 24期

关键词：

D O I：

10.1039/ft9959104441

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 interaction of hydrogen with ZrO2 at high temperatures (673-873 K) has been studied by using in situ FTIR spectroscopy. OH species are formed with O-H stretching frequencies at 3650 cm(-1) on the surface of monoclinic and at 3730 cm(-1) on the surface of tetragonal zirconia. The role of these hydroxy groups in the mechanism of hydrogen uptake and desorption at high temperatures, previously observed on monoclinic ZrO2, is discussed. According to our proposal, the nature of the hydrogen uptake of monoclinic zirconia consists of a heterolytic dissociation of molecular hydrogen and the simultaneous formation of OH species and hydridic species at adjacent O2- and Zr3+ surface sites.

引用

页码：4441 / 4444

页数：4

共 22 条

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