Atmospheric environment

Heterogeneous reaction of NO2 on the surface of montmorillonite particles

Zefeng Zhang , Jing Shang , Tong Zhu , Hongjun Li , Defeng Zhao , Yingju Liu , Chunxiang Ye


Received December 06, 2011,Revised January 01, 2012, Accepted , Available online October 08, 2012

Volume 24,2012,Pages 1753-1758

The studies on heterogeneous reactions over montmorillonite, which is a typical 2:1 layered aluminosilicate, will benefit to the understanding of heterogeneous reactions on clay minerals. Montmorillonite can be classified as sodium montmorillonite or calcium montmorillonite depending on the cation presented between the different layers. Using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), the heterogeneous reaction mechanism of NO2 on the surface of montmorillonite was firstly investigated. Results showed that the reaction of NO2 on the surface of sodium and calcium montmorillonite fit a first-order kinetics, and the reaction duration of calcium montmorillonite was longer than that of sodium montmorillonite under the dry condition. For either sodium or calcium montmorillonite, the uptake coefficient decreased as humidity increased.

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