Kinetics of the interaction of water vapour with mineral dust and soot surfaces at T = 298 K

Literature Information

Publication Date 2004-02-11
DOI 10.1039/B314568A
Impact Factor 3.676
Authors

Sabine Seisel, Yu Lian, Thorsten Keil, Maxim E. Trukhin, Reinhard Zellner


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Abstract

The interaction of water vapour with mineral dust and soot surfaces has been studied at T = 298 K using a Knudsen cell reactor. For the uptake of water vapour on mineral dust an adsorption constant of kads = 6.0 ± 1.1 s−1, corresponding to an uptake coefficient of γini = (4.2 ± 0.7) × 10−2 has been determined. The uptake has been found to be reversible and a desorption rate constant of kdes = (1.7 ± 0.1) × 10−3 s−1 has been determined. For the uptake of water vapour on soot an uptake coefficient of γini = (3.6 ± 2.0) × 10−4 has been determined. However, in this case the uptake was found to be more complex with reversible adsorption and rapid saturation of surface sites simultaneously taking place. In order to separate the adsorption and desorption process, additional experiments using D2O as gaseous reactant have been performed.

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