Surface chemistry of alkyl and perfluoro ethers: a FTIR and ab initio study of adsorption and decomposition of CF3OCF3 on an Al2O3 surface
1997; Elsevier BV; Volume: 380; Issue: 2-3 Linguagem: Inglês
10.1016/s0039-6028(97)00037-x
ISSN1879-2758
Autores Tópico(s)Inorganic Fluorides and Related Compounds
ResumoThe adsorption and thermal decomposition of perfluorodimethyl ether, (CF3)2O, on a high-surface-area Al2O3 surface was investigated by FTIR under both vacuum and pressure conditions. IR spectra in the 4000-1050 cm−1 range were collected and the spectral assignments were assisted by quantum chemical ab initio calculations. The spectral evidence indicated that (CF3)2O decomposed to form adsorbed fluoroformate, FCOO (ads). Increases of temperature (up to 525 K) caused the FCOO (ads) to convert to hydrogen formate, HCOO (ads). Surface hydroxyl groups participated in the decomposition of (CF3)2O and the conversion of FCOO (ads) to HCOO (ads). A decomposition mechanism is proposed.
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