We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
A vibrational spectroscopic study of the thermal behavior of Re<sub>2</sub>(CO)<sub>10</sub> on zeolite Y.
- Authors
Poissant, Robert R.; Yining Huang
- Abstract
This work describes the thermal decomposition of Re2(CO)10 in zeolite Y, which generates the zeolite-supported complex Re0(CO)3(O-Z)3, where (O-Z) represents a framework oxygen. The adsorption and thermal decomposition of Re2(CO)10 was performed on dehydrated and hydrated zeolite NaY. The conversion to Re0(CO)3(O-Z)3 was not significantly affected by the presence of water within the supercages as the supported complex formed at around 200 °C no matter what the initial water content of the zeolite was. However, when the zeolite sample was treated at ≥200 °C for long periods, the adsorbed H2O became involved in the reactivity, playing a role as an oxidant. The subcarbonyl complex Re0(CO)3(O-Z)3 was oxidized, generating isolated Re2O7 or HReO4, or a mixture of both, which was dispersed inside the zeolite host. This result suggests that thermal decomposition of Re2(CO)10 on a hydrated zeolite under mild conditions can be a convenient route for preparation of zeolite-supported Re2O7 catalysts. Re0(CO)3(O-Z)3 was also formed in siliceous zeolite Y (SiY) upon heating. But it quickly decomposes into metal Re at around 200 °C, suggesting that the tricarbonyl species is destabilized in the almost natural zeolite framework. The present study also shows that FT-Raman spectroscopy is a useful technique for monitoring the behavior of the metal carbonyl species in zeolitic hosts.
- Subjects
RAMAN spectroscopy; SPECTRUM analysis; ZEOLITES; OXYGEN; ORGANORHENIUM compounds; RHENIUM
- Publication
Canadian Journal of Chemistry, 2004, Vol 82, Issue 10, p1442
- ISSN
0008-4042
- Publication type
Article
- DOI
10.1139/V04-119