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)(NH 3) 6 exhibited e.s.r. signal characteristic for four d 5 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 δNH 3 region also indicated that the symmetry of the NH 3 ligand coordination sphere was lowered upon thermal activation. Activation at temperature higher than 523 K resulted in the formation of RuO x 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)(NH 3) 6 toward hydrolysis depended on the zeolite type used. Finally, we report that the dispersion of the Ru metal, formed upon H 2 reduction, was controlled by the state of the dispersion of the oxidized Ru.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
