In situ FTIR studies of high-temperature adsorption of hydrogen on zirconia
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 91 (24) , 4441-4444
- https://doi.org/10.1039/ft9959104441
Abstract
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.Keywords
This publication has 0 references indexed in Scilit: