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Heterogeneous Interactions of Volatile Organic Compounds with Natural Mineral Dust Samples

Abstract : This thesis investigates the interactions of volatile organic compounds (VOCs) with natural mineral dust samples. The VOCs used are isopropanol (IPA), isoprene (ISP) and acetic acid (AcA). Five natural mineral dust samples originating from various desert regions all over the world are used in this study.It is evidenced that the origin, I.E. the chemical composition, of the natural dust sample plays a significant role in defining the nature of its interaction with the VOCs. In particular, an increase of uptake is observed with increasing Al/Si and Fe/Si elemental rations. Moreover, the dust-VOC interaction is evidenced as being highly impacted by relative humidity and temperature.Various interactions modes have been evidenced between dust and VOCs such as physisorption, chemisorption and reactive sorption depending on the chemical composition of the dust and the structure of the VOC. Depending on the interaction mode, heterogeneous processes can act as a sink of primary VOCs or even a soure of secondary oxygenated VOCs in the gas phase. This work emphasiez the contribution of heterogeneous processes to the atmosphere.
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Mohamad Nour Zeineddine. Heterogeneous Interactions of Volatile Organic Compounds with Natural Mineral Dust Samples. Theoretical and/or physical chemistry. Ecole nationale supérieure Mines-Télécom Lille Douai, 2018. English. ⟨NNT : 2018MTLD0005⟩. ⟨tel-02899546⟩

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