FTIR study of adsorption and reactions of ethylene oxide on powdered TiO2
Lien, CFu; Ho, CH; Shieh, CYi; Tseng, C; Lin, JL
| HERO ID | 1948018 |
|---|---|
| In Press | No |
| Year | 2008 |
| Title | FTIR study of adsorption and reactions of ethylene oxide on powdered TiO2 |
| Authors | Lien, CFu; Ho, CH; Shieh, CYi; Tseng, C; Lin, JL |
| Journal | Journal of Physical Chemistry C |
| Volume | 112 |
| Issue | 22 |
| Page Numbers | 8365-8371 |
| Abstract | Adsorption, thermal decomposition, and photoreactions of ethylene oxide (EO) on powdered TiO2 have been studied by Fourier-transformed infrared spectroscopy. Most of the adsorbed EO molecules at the saturated coverage on 35 degrees C TiO2 remain intact. As the temperature is increased (>= 100 degrees C), the surface EO molecules dissociate into ethylene glycol-like species (-OCH2CH2OH or -OCH2CH2O-) by ring rupture and crotonaldehyde (CH3CH = CHCHO) possibly via acetaldehyde from EO isomerization. The ring-opening process is enhanced in the presence of coadsorbed H2O molecules. EO with the highly strained three-membered ring is thermally more reactive than 1,4-dioxane on TiO2. EO molecules adsorbed on TiO2 readily undergo photodegradation in O-2, forming surface H2O, CO2, HCO3, CO3, and HCOO. The,comparative studies of O-16(2) and O-18(2) indicate that both O-2 and lattice oxygen take part in the EO photodecomposition. The reaction pathways involving the two oxygen species are discussed. |
| Doi | 10.1021/jp711700d |
| Wosid | WOS:000256265100044 |
| Url | https://pubs.acs.org/doi/10.1021/jp711700d |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |