Kinetics for Preparation of K2Ti2O5 Using TiO2 Microparticles and Nanoparticles as Precursors

doi:10.1016/j.cjche.2013.04.001

Abstract

Abstract: The formation mechanism of K₂Ti₂O₅ was investigated with TiO₂ microparticles and nanoparticles as precursors by the thermogravimetric (TG) technique. Amethod of directmultivariate non-linear regression was applied for simultaneous calculation of solid-state reaction kinetic parameters fromTG curves. TG results showmore regular decrease from initial reaction temperature with TiO₂ nanoparticles as raw material compared with TiO₂ microparticles, while mass losses finish at similar temperatures under the experimental conditions. From the mechanism and kinetic parameters, the reactions with the two materials are complex consecutive processes, and reaction rate constants increase with temperature and decrease with conversion. The reaction proceedings could be significantly hindered when the diffusion process of reactant species becomes rate-limiting in the later stage of reaction process. The reaction active sites on initial TiO₂ particles and formation of product layers may be responsible to the changes of reaction rate constant. The calculated results are in good agreement with experimental ones.

Key words: Solid-state, Kinetics, Particle, Reaction, Non-linear regression

摘要： The formation mechanism of K₂Ti₂O₅ was investigated with TiO₂ microparticles and nanoparticles as precursors by the thermogravimetric (TG) technique. Amethod of directmultivariate non-linear regression was applied for simultaneous calculation of solid-state reaction kinetic parameters fromTG curves. TG results showmore regular decrease from initial reaction temperature with TiO₂ nanoparticles as raw material compared with TiO₂ microparticles, while mass losses finish at similar temperatures under the experimental conditions. From the mechanism and kinetic parameters, the reactions with the two materials are complex consecutive processes, and reaction rate constants increase with temperature and decrease with conversion. The reaction proceedings could be significantly hindered when the diffusion process of reactant species becomes rate-limiting in the later stage of reaction process. The reaction active sites on initial TiO₂ particles and formation of product layers may be responsible to the changes of reaction rate constant. The calculated results are in good agreement with experimental ones.

关键词: Solid-state, Kinetics, Particle, Reaction, Non-linear regression

Hanbing He, Chang Liu, Xiaohua Lu. Kinetics for Preparation of K₂Ti₂O₅ Using TiO₂ Microparticles and Nanoparticles as Precursors[J]. , 2014, 22(10): 1105-1110.

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Kinetics for Preparation of K₂Ti₂O₅ Using TiO₂ Microparticles and Nanoparticles as Precursors

Kinetics for Preparation of K₂Ti₂O₅ Using TiO₂ Microparticles and Nanoparticles as Precursors

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