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Heterogeneous photo-catalysis from the perspective of the adsorbed state. The photo-oxidation of propan-2-ol to propan-2-one on rutile titanium dioxide.
- Source :
-
Journal of Catalysis . Aug2018, Vol. 364, p89-101. 13p. - Publication Year :
- 2018
-
Abstract
- O 2 -titrations accompanying ESR, adsorption isotherm and TPD studies of well-crystallised powdered rutile provide insights into the nature of the reduced surface following adsorption of propan-2-ol at 300 K. Estimates have been made of the mean dimensions of the octa-decahedral micro-crystallites, and of the manner in which UV-A radiation penetrates into a randomised particle-bed. The reduced surface contains a small fractional coverage (0.003monolayer) of paramagnetic Ti 3+ A sites (1.1 × 10 16 m −2 ) that appear to be associated mainly with the crystallite edges, and a large majority (>98%) of diamagnetically-coupled Ti 3+ A-B spin-pairs arranged in the form of extended defects on the crystallite faces. UV-A is found to activate only a thin layer of particles at the bed exterior (0.83%) on which a large fraction (>30%) of the Ti 4+ oct sites become reduced to paramagnetic Ti 3+ A at 78 K, and mainly to spin-pairs at 300 K, with implications for their subsequent reactivity with oxidising gases. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PHOTOCATALYSIS
*PHOTOOXIDATION
*RUTILE
*TITANIUM dioxide
*VOLUMETRIC analysis
Subjects
Details
- Language :
- English
- ISSN :
- 00219517
- Volume :
- 364
- Database :
- Academic Search Index
- Journal :
- Journal of Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 130721479
- Full Text :
- https://doi.org/10.1016/j.jcat.2018.04.023