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Study of solid/gas phase photocatalytic reactions by electron ionization mass spectrometry
Author(s) -
Nuño Manuel,
Ball Richard J.,
Bowen Chris R.
Publication year - 2014
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.3396
Subject(s) - chemistry , anatase , photocatalysis , rutile , analytical chemistry (journal) , relative humidity , atmospheric pressure , mass spectrometry , irradiation , residual gas analyzer , chromatography , catalysis , organic chemistry , physics , oceanography , nuclear physics , thermodynamics , geology
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 2 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 2 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 −5 mbar. The apparatus and methodology have been demonstrated to provide high sensitivity (ppb). The rate of degradation of NO 2 attributed to reaction at the TiO 2 surface was sensitive to both crystal structures (anatase or rutile) and wavelength of irradiation. Copyright © 2014 John Wiley & Sons, Ltd.