| Publication Type |
Journal Article |
| Title |
Photochemistry of benzophenone adsorbed on MCM-41 surface |
| Authors |
JP Da Silva IF Machado João P. Lourenço LFV Ferreira |
| Groups |
CATHPRO |
| Journal |
MICROPOROUS AND MESOPOROUS MATERIALS |
| Year |
2005 |
| Month |
September |
| Volume |
84 |
| Number |
1 |
| Pages |
1-10 |
| Abstract |
The photochemistry of benzophenone adsorbed on a channel-type solid support MCM-41 was studied by the use of diffuse reflectance and chromatographic techniques. For comparison purposes parallel studies were also conducted on silicalite and H-ZSM-5. The observed ground state absorption, luminescence and transient absorption spectra and photoproduct distribution strongly depend on the substrate under study. Triplet state luminescence was observed in all solids, hydrogen-bonded excited benzophenone emission was detected on MCM-41 while protonated excited benzophenone luminescence was observed only on H-ZSM-5. Transient absorption showed the triplet state in all solids and formation of the OH benzophenone adduct on MCM-41 and H-ZSM-5. Ketyl radical formation occurs after 355 nm irradiation but is a minor degradation pathway. The formation of transients resulting from the reaction of benzophenone with molecular oxygen was also detected on MCM-41, in air-equilibrated conditions and benzoic acid is the main degradation product. 2-Hydroxybenzophenone is one of the major photodegradation products on MCM-41 and H-ZSM-5. Products resulting from the alpha-cleavage were also detected under 266 nm irradiation. Benzophenone was found to be very stable in silicalite under all used conditions. (c) 2005 Elsevier Inc. All rights reserved. |
| DOI |
http://dx.doi.org/10.1016/j.micromeso.2005.05.012 |
| ISBN |
|
| Publisher |
|
| Book Title |
|
| ISSN |
1387-1811 |
| EISSN |
|
| Conference Name |
|
| Bibtex ID |
ISI:000232036300001 |
| Observations |
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