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Surface Chemistry of Formaldehyde on Rutile TiO2(011)-(2 Ă— 1) Surface: Photocatalysis Versus Thermal-Catalysis
- Source :
- The Journal of Physical Chemistry C. 121:25921-25929
- Publication Year :
- 2017
- Publisher :
- American Chemical Society (ACS), 2017.
-
Abstract
- Investigating the surface chemistry of formaldehyde on the surface of TiO2 is important in understanding the thermal-catalytic and photocatalytic reactions of formaldehyde on TiO2-involved catalysts. By combining thermal desorption spectroscopy and X-ray photoelectron spectroscopy, we studied the adsorption, thermo-induced surface reactions, and photo-induced surface reactions of formaldehyde on the rutile TiO2(011)-(2 × 1) surface. The dominant thermal-catalytic reaction is the formation of ethylene by a reductive carbon–carbon formation reaction of formaldehyde adsorbed at the oxygen vacancy sites, and the dominant photocatalytic reaction is the formation of formate, assisted by the bridge O2c sites, followed by carbon monoxide formation at elevated temperatures. The surface intermediates of formaldehyde reactions to ethylene and carbon monoxide on the rutile TiO2(011)-(2 × 1) surface were identified. The effect of the surface structure of the rutile TiO2(011)-(2 × 1) surface, particularly the oxygen va...
- Subjects :
- Chemistry
Thermal desorption spectroscopy
Inorganic chemistry
Formaldehyde
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
Oxygen
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Catalysis
chemistry.chemical_compound
General Energy
Adsorption
Rutile
Photocatalysis
Physical and Theoretical Chemistry
0210 nano-technology
Carbon monoxide
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 121
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi...........7a379b8d6f58cce2569822dfa706606c