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EnglishCubic sulfated zirconia (c-SZ) was prepared by sulfating phase-stabilised c-ZrO2, and its properties are compared with those of tetragonal (t-SZ) and monoclinic (m-SZ) systems. ZrO2 crystalline phases have been identified by XRD and, far more efficiently, by Raman spectroscopy. c-SZ exhibits better catalytic activity (n-butane isomerization at 423 K) than t-SZ, whereas m-SZ is virtually inactive. The better activity of c-SZ is not ascribable to changes of surface functionalities, but probably derives from a better stabilization of the high symmetry crystalline form (i.e., from a more favourable distribution of surface sulfates among regular and defective crystal terminations).
| Titolo: | Catalytic activity and some related spectral features of yttria-stabilised sulfated zirconia | |
| Autori Riconosciuti: | ||
| Autori: | C. Morterra; G. Cerrato; G. Meligrana; M. Signoretto; F. Pinna; G. Strukul | |
| Data di pubblicazione: | 2001 | |
| Abstract: | Cubic sulfated zirconia (c-SZ) was prepared by sulfating phase-stabilised c-ZrO2, and its properties are compared with those of tetragonal (t-SZ) and monoclinic (m-SZ) systems. ZrO2 crystalline phases have been identified by XRD and, far more efficiently, by Raman spectroscopy. c-SZ exhibits better catalytic activity (n-butane isomerization at 423 K) than t-SZ, whereas m-SZ is virtually inactive. The better activity of c-SZ is not ascribable to changes of surface functionalities, but probably derives from a better stabilization of the high symmetry crystalline form (i.e., from a more favourable distribution of surface sulfates among regular and defective crystal terminations). | |
| Volume: | 73 (3-4) | |
| Pagina iniziale: | 113 | |
| Pagina finale: | 119 | |
| Digital Object Identifier (DOI): | 1011-372X/01/0500-0113$19.50/0 | |
| Parole Chiave: | cubic zirconia; sulfated zirconia (SZ) catalysts; n-butane isomerisation; surface acidity of SZ catalysts; IR spectra of adsorbed pyridine | |
| Rivista: | CATALYSIS LETTERS | |
| Appare nelle tipologie: | 03A-Articolo su Rivista |
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