Publications by authors named "Michele Pijolat"
Article Synopsis
- Zinc oxide (ZnO) is used to remove sulfur from gas in a process called Fischer-Tropsch, but not much is known about how this happens at a tiny level.
- Researchers created a special ZnO material to study its change into zinc sulfide (ZnS), which showed that the ZnS particles formed in a specific shape and grew outwards.
- They found that the reaction that turns ZnO into ZnS happens very quickly at first, but then gets slower due to the formation of small empty spaces at the interface between ZnO and ZnS.
A kinetic model for the dehydration of lithium sulfate monohydrate is proposed in order to account for experimental data obtained on single crystals by thermogravimetry at 80 degrees C under fixed water vapour pressure, and by optical microscopy. This model is based on the assumptions of Mampel's model, the nucleation takes place randomly at the surface of the solid and is followed by isotropic growth toward the centre of the crystal. Calculated rates dalpha/dt are obtained by means of Monte-Carlo simulations and compared to the experimental ones, which leads to the determination of two kinetic constants: the areic frequency of nucleation (in number of nuclei m(-2) s(-1)) and the areic reactivity of growth (in mol m(-2) s(-1)).
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