AI Article Synopsis
- The study examines how tertiary alcohols, specifically tert-butanol, react on the rutile TiO(110)-surface under thermal and photochemical conditions.
- At low temperatures (100 K), the primary photochemical reaction involves the ejection of a methyl radical and the formation of acetone, while at room temperature (293 K), isobutene production also occurs photochemically.
- The research highlights how varying temperatures affect reaction selectivity and underscores the importance of thermal effects in photocatalysis.
Article Abstract
The thermal and photochemical mechanistic pathways for tertiary alcohols on the rutile TiO(110)-surface are studied with the example of tert-butanol. While the thermal reaction is known to yield isobutene, the photochemical ejection of a methyl radical is observed at 100 K. The C-C scission, which is accompanied by the formation of acetone, is the only photochemical reaction pathway at this temperature and can be attributed to the reaction of photoholes that are created upon UV-light illumination at the surface of the n-type semiconductor. At 293 K the selectivity of the reaction changes, as isobutene is additionally formed photochemically. A comparison of the kinetics of the different reactions reveals further insights. Together with the quantitative evaluation of the reaction products at low temperatures and the comparison of the reaction pathways at different temperatures it is demonstrated how thermal effects can influence the selectivity of the reactions in photocatalysis.
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| http://dx.doi.org/10.1039/c8cp00223a | DOI Listing |
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