Abstract

This paper describes a novel methodology for the real-time study of solid-gas phase photocatalytic reactions in situ. A novel reaction chamber has been designed and developed to facilitate the investigation of photoactive materials under different gas compositions. UV irradiation in the wavelength of ranges 376-387 and 381-392 nm was provided using specially designed high efficiency light emitting diode arrays. The experiments used air containing 190 ppm NO in a moist environment with a relative humidity of 0.1%. Photocatalytic samples consisting of pressed pellets of rutile and anatase crystalline forms of TiO were monitored over a period of 150 min. An ultra-high vacuum right angled bleed valve allowed a controlled flow of gas from the main reaction chamber at atmospheric pressure to a residual gas analyser operating at a vacuum of 10 mbar. The apparatus and methodology have been demonstrated to provide high sensitivity (ppb). The rate of degradation of NO attributed to reaction at the TiO surface was sensitive to both crystal structures (anatase or rutile) and wavelength of irradiation.
Original languageEnglish
Pages (from-to)716-726
Number of pages11
JournalJournal of Mass Spectrometry
Volume49
Issue number8
Early online date8 Jul 2014
DOIs
Publication statusPublished - 1 Aug 2014

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Ionization
Mass spectrometry
Gases
Electrons
Irradiation
Wavelength
Time and motion study
Ultrahigh vacuum
Atmospheric pressure
Light emitting diodes
Flow of gases
Atmospheric humidity
Crystal structure
Vacuum
Crystalline materials
Degradation
titanium dioxide
Air
Chemical analysis
Experiments

Cite this

Study of solid/gas phase photocatalytic reactions by electron ionization mass spectrometry. / Nuño, Manuel; Ball, Richard J.; Bowen, Chris R.

In: Journal of Mass Spectrometry, Vol. 49, No. 8, 01.08.2014, p. 716-726.

Research output: Contribution to journalArticle

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