Intrinsic catalytic properties of extruded clay honeycomb monolith toward complete oxidation of air pollutants

[Display omitted] •Clay monolith catalytic performance toward air pollution abatement was evaluated.•17 air pollutants including CO, CH4 and various VOCs were tested.•All tested compounds were effectively completely oxidized to H2O and CO2.•Intrinsic catalytic activity of the clay was tentatively at...

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Bibliographic Details
Published in:Journal of hazardous materials 2015-12, Vol.300, p.590-597
Main Authors: Assebban, Mhamed, Kasmi, Achraf El, Harti, Sanae, Chafik, Tarik
Format: Article
Language:English
Subjects:
Carbon monoxide
Catalytic oxidation
Honeycomb monolith
Natural clay
VOCs
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Summary:[Display omitted] •Clay monolith catalytic performance toward air pollution abatement was evaluated.•17 air pollutants including CO, CH4 and various VOCs were tested.•All tested compounds were effectively completely oxidized to H2O and CO2.•Intrinsic catalytic activity of the clay was tentatively attributed to predisposed acid centers.•Dissimilarities between reactants induced differences in clay’s catalytic activity. The present work highlights the intrinsic catalytic properties of extruded clay honeycomb monolith toward complete oxidation of various air pollutants namely CO, methane, propane, acetylene, propene, n-butene, methanol, ethanol, n-propanol, n-butanol, acetone, dimethyl ether, benzene, toluene, o-xylene, monochlorobenzene and 1,2-dichlorobenzene. Total catalytic conversion was achieved for all tested compounds with different behaviors depending on pollutants’ structural and chemical nature. The comparison of T50 values obtained from light-off curves allowed the establishment of the following reactivity sequence: ketone>alcohol>ether>CO>alkyne>aromatic>alkene>chlorinated aromatic>alkane. The intrinsic catalytic performances of the natural clay was ascribed to the implication of a quite complex mixture constituted by OH groups (Brønsted acids) and coordinately-unsaturated cations, such as Al3+, Fe3+ and Fe2+ (Lewis acids). Hence, the combination of the clay’s intrinsic catalytic performances and easier extrudability suggests a promissory potential for application in air pollution control.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2015.07.067