INTERACTION OF GROUP-6 METAL-CARBONYLS WITH SULFATED ZIRCONIUM DIOXIDE - IR STUDIES

Citation
Ee. Platero et Mp. Mentruit, INTERACTION OF GROUP-6 METAL-CARBONYLS WITH SULFATED ZIRCONIUM DIOXIDE - IR STUDIES, Inorganic chemistry, 33(7), 1994, pp. 1506-1509
Citations number
31
Categorie Soggetti
Chemistry Inorganic & Nuclear
Journal title
ISSN journal
00201669
Volume
33
Issue
7
Year of publication
1994
Pages
1506 - 1509
Database
ISI
SICI code
0020-1669(1994)33:7<1506:IOGMWS>2.0.ZU;2-Y
Abstract
The interaction of Cr(CO)6, MO(CO)6, and W(CO)6, with dehydroxylated a ctive zirconia (prepared by thermolysis of a zirconium sulfate) has be en studied by in situ IR spectroscopy. Adsorption of the three metal c arbonyls takes place via O-bonding between a CO ligand and Lewis acid sites on the zirconia surface. Two kinds of these sites (with differen t Lewis acid strength) have been identified using CO as a spectroscopi c probe. Formation of surface adducts between the zirconia support and the metal carbonyls was found to labilize CO ligands. Reversible deca rbonylation of the adsorbed metal carbonyls was observed when pumping at room temperature. Subsequent admission of CO into the IR cell regen erates the hexacarbonyl surface adducts. The stability of these adduct s (toward decarbonylation) was found to follow the order W(CO)6 > Cr(C O)6 > MO(CO)6.