Photocatalytic degradation of triethylamine on titanium oxide thin films

Journal Article · Mon Nov 15 04:00:00 EST 1999 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1999.2617· OSTI ID:20003849

Huang, A; Cao, L; Chen, J; Spiess, F J; Suib, S L; Obee, T N; Hay, S O; Freihaut, J D

Photooxidation of triethylamine (TEA) in the presence of O{sub 2}, N{sub 2}, and H{sub 2}O over titanium oxide (TiO{sub 2}) was investigated using a flat plate reactor. TEA was photocatalytically oxidized to CO{sub 2} and some by-products on TiO{sub 2} thin film catalysts. The intrinsic oxidation rate of the reaction was determined and was dependent on TEA concentration, humidity level, and light intensity. Photocatalytic deactivation was observed in these reactions. Fourier transform infrared (FTIR) and temperature-programmed desorption with a mass spectrometer as a detector (TPD-MS) were used to characterize the surface of the catalyst and study the deactivation mechanism. FTIR and TPD-MS results suggest that accumulation of carboxylic acid species, -N-N=O, and some other accumulation of carboxylic acid species, -N-N=O, and some other carbonaceous species occurred during the reaction. These by-product species or intermediates were chemisorbed on the catalyst surface. They were stable under reaction conditions and might be responsible for deactivation of TiO{sub 2} by either poisoning the active sites directly or blocking the adsorption of TEA on the catalyst surface.

• Research Organization: Univ. of Connecticut, Storrs, CT (US)
• OSTI ID: 20003849
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 188; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AMINES
CATALYSTS
CATALYTIC EFFECTS
DEACTIVATION
INDOOR AIR POLLUTION
OXIDATION
PHOTOLYSIS
TITANIUM OXIDES