Please use this identifier to cite or link to this item:
Scopus Web of Science® Altmetric
Type: Journal article
Title: Removal of VOCs from Indoor Environment by Ozonation over Different Porous Materials
Author: Kwong, C.
Chao, C.
Hui, K.
Wan, M.
Citation: Atmospheric Environment, 2008; 42(10):2300-2311
Publisher: Pergamon-Elsevier Science Ltd
Issue Date: 2008
ISSN: 1352-2310
Statement of
C.W. Kwong, Christopher Y.H. Chao, K.S. Hui, M.P. Wan
Abstract: Ozonation of toluene over NaX, NaY and MCM-41 adsorbents was studied targeting for indoor air purification. The combined use of ozone and the various micro- or meso-porous adsorbents aimed to take advantage of the strong oxidizing capability of ozone. At the same time the residual ozone would be minimized due to the enhanced catalytic reaction in the porous structure. To lower the residual ozone level is a crucial issue as ozone is itself an indoor pollutant. The Lewis acid sites in the adsorbents were believed to decompose ozone into atomic oxygen, and the subsequent reactions would then convert the adsorbed toluene into CO2 and H2O. In the dry conditions, the MCM-41 required the smallest amount of material to achieve the 90% reduction target, followed by NaY and NaX. In the more humid environment (50% RH), extra amounts of MCM-41 and NaX adsorbents were required to reach the target as compared with the dry conditions. Desorption experiments were also conducted to study the amounts of various major species held in the adsorbents during the catalytic process. A material balance analysis of the major species in both the effluents and the adsorbents showed that within our experimental conditions, about 20–40% of the removed toluene was carried out via catalytic ozonation while adsorption covered the rest. Trace amount of intermediate species such as aldehydes and organic acids were identified in the desorbed gas indicating that they were withheld by the adsorbents during the air purification process and those in the effluent were below detection levels.
Keywords: Ozone
Rights: © 2007 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.atmosenv.2007.12.030
Published version:
Appears in Collections:Aurora harvest 5
Chemical Engineering publications

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.