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- W2055144825 abstract "The chemistry of Ru(III) hexaamine complex imbedded in zeolite has been investigated by e.s.r., i.r., and other techniques. Zeolite-supported Ru(III)(NH3)6 exhibited e.s.r. signal characteristic for four d5 low-spin configuration species in an octahedral tetragonally distorted crystal field symmetry. Upon thermal activation, change from axial to orthorhombic symmetry occurred. I.r. analysis in the δNH3 region also indicated that the symmetry of the NH3 ligand coordination sphere was lowered upon thermal activation. Activation at temperature higher than 523 K resulted in the formation of RuOx species. The results will be discussed in terms of rapid hydrolysis of the cationic Ru(III), with the subsequent formation of ruthenium red complexes that were decomposed into ruthenium oxide at higher temperature. The stability of Ru(III)(NH3)6 toward hydrolysis depended on the zeolite type used. Finally, we report that the dispersion of the Ru metal, formed upon H2 reduction, was controlled by the state of the dispersion of the oxidized Ru." @default.
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- W2055144825 date "1989-01-01" @default.
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- W2055144825 title "E.s.r. and i.r. studies of ruthenium (III) hexaamine-exchanged zeolites" @default.
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- W2055144825 doi "https://doi.org/10.1016/0144-2449(89)90009-2" @default.
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