Heterogeneous photocatalytic oxidation of gas-phase organics for air purification: Acetone, 1-butanol, butyraldehyde, formaldehyde, and m-xylene oxidation
- North Carolina State Univ., Raleigh (United States)
Photocatalyzed degradations of trace levels of various oxygenates and an aromatic in air were carried out using near-UV-illuminated titanium dioxide (anatase) powder. The initial rates of degradation for acetone, 1-butanol, formaldehyde, and m-xylene were well described by Langmuir-Hinshelwood rate forms. No reaction intermediates were detected for acetone oxidation at conversions of 5-20%. Butyraldehyde was the main product of 1-butanol oxidation for conversions of 20-30%. The influence of 5% water (simulating partial humidification) in the feedstream varied strongly: water vapor inhibited acetone oxidation, but had no influence on the 1-butanol conversion rate. m-Xylene conversion was enhanced by trace water addition, but inhibited at higher water levels. Some catalyst deactivation was detected between 1-butanol runs; the activity could be easily recovered by illuminating the catalyst in fresh air. Formaldehyde was also successfully oxidized. These results, taken together with earlier literature with earlier literature citations for photocatalyzed total oxidation of methane, ethane, trichloroethylene, toluene, and a very recent report for oxidation of odor compounds, indicate a favorable technical potential for photocatalyzed treatment of air in order to degrade and remove all major classes of oxidizable air contaminants.
- OSTI ID:
- 7129352
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 136:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ACETONE
AIR
AIR POLLUTION
AIR POLLUTION CONTROL
ALCOHOLS
ALDEHYDES
ALKYLATED AROMATICS
AROMATICS
BUTANOLS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DEACTIVATION
ELECTROMAGNETIC RADIATION
EQUATIONS
FLUIDS
FORMALDEHYDE
GASES
HYDROCARBONS
HYDROXY COMPOUNDS
INDOOR AIR POLLUTION
KETONES
KINETIC EQUATIONS
NEAR ULTRAVIOLET RADIATION
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION
POLLUTION CONTROL
PURIFICATION
RADIATIONS
REGENERATION
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET RADIATION
VAPORS
WATER VAPOR
XYLENES