Simple and advanced nucleation and growth kinetics of MoS2
- Michał Wojtalik,
- Łukasz Makowski
Molybdenum disulphide nanoparticles (MoS2) synthesis were examined in terms of the precipitation kinetics. The authors describe the simple and advance kinetic model of molybdenum disulphide nucleation and growth in the complex wet chemical synthesis using ammonium heptamolybdate and ammonium sulphide in a vortex jet reactor. Molybdenum disulphide (MoS2) is one of the transition metal dichalcogenides (TMDs), and it is considered to be a valuable 2D-nanomaterial for a wide range of industrial applications. One of promising application is the use of MoS2 in several catalytic reactions, such as hydrogen evolution reaction (HER), hydrodesulfurization, oxygen reduction reactions (ORR), and methane conversion. This could be essential in future environmental projects involves sustainable sources of energy. Synthesis of molybdenum disulphide nanoparticles was carried out in the turbulent mixer with tangential geometry. Ammonium molybdate tetrahydrate (NH4)6Mo7O24 ⋅ 4 H2O (HMA), citric acid C6H8O7 (CA), and ammonium sulphide (NH4)2S (AS) were used as substrates of the reaction. Firstly, ammonium molybdate tetrahydrate and citric acid were dissolved at 90 °C and mixed for at least 30 minutes. To keep expected stoichiometric molar ratio of Mo:(NH4)2S, 20 wt.% solution of ammonium sulphide (AS) were properly diluted. In order to measure particles diameter, Beckman&Coulter LS 13 320 device has been employed, which uses DLS – dynamic light scattering and LD – laser diffraction to improve possible measurement range. The reaction mechanism in witch sulfuric ion dissociation is a limiting process has been partially confirmed by experiments with excess and insufficient amount of HMA. Parity plots for moments and characteristic sizes shows clearly the accuracy of the model. Therefore proposed kinetics model for the nucleation and growth is assumed to be sufficient empirical model of the process and can be used in basic engineering application to predict the final PSD of MoS2.
- Record ID
- Publication type
- Article number
- EYEC Monograph: 9th European Young Engineers Conference, 2021, Warszawa, Politechnika Warszawska, Wydział Inżynierii Chemicznej i Procesowej, 183 p., ISBN 978-83-936575-9-9
- Keywords in English
- molybdenum disulphide, nanoparticles, precipitation, jet reactor
- Related project
- [2017/27/B/ST8/01382] Badanie kinetyki powstawania kryształów disiarczku molibdenu w celu uzyskania produktu o pożądanych właściwościach w reaktorach zderzeniowych. . Project leader at WUT: Łukasz Makowski,
+48 22 234 62 94, start date 10-08-2018, end date 09-08-2021, in run
- eng (en) English
- Score (nominal)
- Additional fields
- Uwagi: This work was supported by the National Science Centre [No.2017/27/B/ST8/01382].
- Uniform Resource Identifier
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