A. Trunschke et al., IN-SITU FTIR STUDIES OF HIGH-TEMPERATURE ADSORPTION OF HYDROGEN ON ZIRCONIA, Journal of the Chemical Society. Faraday transactions, 91(24), 1995, pp. 4441-4444
Citations number
22
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
The interaction of hydrogen with ZrO2 at high temperatures (673-873 K)
has been studied by using in situ FTIR spectroscopy. OH species are f
ormed 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 a
nd desorption at high temperatures, previously observed on monoclinic
ZrO2, is discussed. According to our proposal, the nature of the hydro
gen uptake of monoclinic zirconia consists of a heterolytic dissociati
on of molecular hydrogen and the simultaneous formation of OH species
and hydridic species at adjacent O2- and Zr3+ surface sites.