The nitric oxide ISO photocatalytic reactor system: Measurement of NOx removal activity and capacity

A. Mills, S. Elouali

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Although the NO removal-based air-purification ISO method ISO 22197-1:2007 is well established, its preconditioning requirements mean that only the initial activity of the photocatalyst under test is measured owing to the often-reported, gradual alteration of the surface kinetics for NO oxidation by air through the accumulation of surface HNO3. Herein, we compare the photocatalytic NO removal abilities of a number of different, common TiO2 materials, surface-saturated with photogenerated HNO3, with their behaviours observed during the typical 5 h-long ISO standard test. It is found that all the TiO2 materials studied eventually become largely NO to NO2 converters after sufficient exposure to NO under irradiation (>5 h) due to the accumulation of surface HNO3. The UV exposure time, t*, necessary to reach this HNO3 saturated condition is different for each different catalyst. As a consequence, an alternative preconditioning process for the ISO method is proposed which can be used to provide a more realistic measure of the photocatalytic activity of the underlying material and provide a measure of the NOx removing capacity of the photocatalytic material under test.
Original languageEnglish
Pages (from-to)29-36, Impact Factor: 2.5
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume305
Early online date07 Mar 2015
DOIs
Publication statusPublished - 2015

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