Kinetics of the interaction of water vapour with mineral dust and soot surfaces at T = 298 K
文献情報
Sabine Seisel, Yu Lian, Thorsten Keil, Maxim E. Trukhin, Reinhard Zellner
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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