Issue 1, 1995

Surface characterization of yttria-stabilized tetragonal ZrO2. Part 3.—CO2 adsorption and the CO2–CO interaction

Abstract

The surface chemical features and sintering behaviour of two preparations of tetragonal zirconia (t-ZrO2) stabilized with 3 mol % Y2O3 have been examined, and have been compared with those of a 2 mol% t-ZrO2 preparation and a monoclinic zirconia (m-ZrO2) preparation.

The adsorption of CO2 indicates that the most peculiar features of the genuine t-ZrO2 phase are: (i) the almost complete absence of surface hydrogencarbonates, related to the virtual absence of monodentate surface OH groups; (ii) the presence of various types of bidentate carbonates; and (iii) the formation of a peculiar monodenate carbonate species, characterized by a very small spectral separation between the coupled CO oscillators (and observed only on all t-ZrO2 preparations). In some stages of the thermal sintering process, some of the characteristics of t-ZrO2 become modified, and the surface chemical behaviour becomes similar to that of m-ZrO2. When metastable t-ZrO2 specimens start to segregate out an amorphous phase, which coats the crystallites, the adsorptivity towards CO2 declines sharply, and the usual carbonate-like species observed on most crystalline oxides no longer form.

When CO2 is preadsorbed onto t-ZrO2, the overall capacity for CO uptake is decreased to a variable extent (15–50%), whereas the IR band corresponding to adsorbed CO is shiffed to higher wavenumbers by surface inductive effects only when CO2 yields appreciable amounts of surface hydrogencarbonate species.

Article information

Article type
Paper

J. Chem. Soc., Faraday Trans., 1995,91, 125-132

Surface characterization of yttria-stabilized tetragonal ZrO2. Part 3.—CO2 adsorption and the CO2–CO interaction

C. Morterra, G. Cerrato and L. Ferroni, J. Chem. Soc., Faraday Trans., 1995, 91, 125 DOI: 10.1039/FT9959100125

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