Acidic and basic properties of zirconia—alumina and zirconia—titania mixed oxides
Two series of mixed oxides ZrO 2Al 2O 3 and ZrO 2TiO 2 were prepared from propylate hydrolysis, followed by drying and calcination. The acidic and basic properties of the various samples were characterized by adsorption of specific probe molecules (carbon dioxide, pyridine, 2,6-di-methylpyridine)...
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Published in | Journal of molecular catalysis Vol. 84; no. 3; pp. 283 - 297 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
25.10.1993
Elsevier Sequoia |
Subjects | |
Online Access | Get full text |
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Summary: | Two series of mixed oxides ZrO
2Al
2O
3 and ZrO
2TiO
2 were prepared from propylate hydrolysis, followed by drying and calcination. The acidic and basic properties of the various samples were characterized by adsorption of specific probe molecules (carbon dioxide, pyridine, 2,6-di-methylpyridine) studied by FT-IR spectroscopy and activity towards two test reactions (2-propanol dehydration and carbon oxysulfide hydrolysis). Both methods showed that a synergy occurred on ZrO
2TiO
2 samples leading to a maximum of Brønsted acidity and a minimum of basicity for ZrO
2 (23%)TiO
2 (77%). On the other hand, the Lewis acidity of ZrO
2Al
2O
3 samples increased with the alumina content whereas the basicity decreased sharply as soon as alumina was introduced. |
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ISSN: | 0304-5102 |
DOI: | 10.1016/0304-5102(93)85061-W |