Heterogeneous and catalytic uptake of ozone on mineral oxides and dusts: A Knudsen cell investigation

The uptake of ozone on various mineral powders has been studied using a Knudsen cell apparatus at T = 296 K. Samples included α‐Al2O3, α‐Fe2O3, SiO2, China loess and Saharan sand. Reactive uptake coefficients, γBET, were measured for the various particles and found to be 8 ± 5 × 10−5 for α‐Al2O3, 1....

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Bibliographic Details
Published in:Geophysical research letters 2002-07, Vol.29 (14), p.10-1-10-4
Main Authors: Michel, A. E., Usher, C. R., Grassian, V. H.
Format: Article
Language:English
Subjects:
Catalysis
China
Dust
Loess
Ozone
Sand
Silicon dioxide
Uptakes
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Summary:The uptake of ozone on various mineral powders has been studied using a Knudsen cell apparatus at T = 296 K. Samples included α‐Al2O3, α‐Fe2O3, SiO2, China loess and Saharan sand. Reactive uptake coefficients, γBET, were measured for the various particles and found to be 8 ± 5 × 10−5 for α‐Al2O3, 1.8 ± 0.7 × 10−4 for α‐Fe2O3 and 5 ± 3 × 10−5 for SiO2. The authentic dust samples were found to have γBET values of 2.7 ± 0.9 × 10−5 for China loess and 6 ± 3 × 10−5 for Saharan sand. Variations in the reactivity of the Saharan sand were observed as a function of sample treatment. Under the conditions of this study, heterogeneous uptake of ozone is catalytic and results in the destruction of ozone.
ISSN:0094-8276
1944-8007
DOI:10.1029/2002GL014896