{"title":"Study of Thermal Decomposition of Layered Double-Magnesium Aluminum Hydroxide","authors":"D. V. Maiorov, E. K. Kopkova","doi":"10.1134/S0040579523050184","DOIUrl":null,"url":null,"abstract":"<p>Layered magnesium aluminum hydroxide Mg<sub>4</sub>Al<sub>2</sub>(OH)<sub>12</sub>CO<sub>3</sub>⋅3.85H<sub>2</sub>O with the hydrotalcite structure is obtained by the solid-phase interaction of AlCl<sub>3</sub>⋅6H<sub>2</sub>O and MgCl<sub>2</sub>⋅6H<sub>2</sub>O with (NH<sub>4</sub>)<sub>2</sub>CO<sub>3</sub> at room temperature. The change in the phase composition of the products of its heat treatment in the temperature range 180–600°C is studied. It is determined by DSC/TG that the thermal decomposition occurs in two stages: the first stage occurs in the temperature range 180–215°C; the second, in the range 400–440°C. The apparent activation energies <i>E</i><sub>a</sub> of both stages of thermal decomposition are found by the model-free Kissinger method to be 62.85 and 141.86 kJ/mol, respectively. The obtained <i>E</i><sub>a</sub> values agree well with the literature data and indicate that both stages are single-step kinetic processes.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"57 5","pages":"1039 - 1044"},"PeriodicalIF":0.7000,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Theoretical Foundations of Chemical Engineering","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0040579523050184","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Layered magnesium aluminum hydroxide Mg4Al2(OH)12CO3⋅3.85H2O with the hydrotalcite structure is obtained by the solid-phase interaction of AlCl3⋅6H2O and MgCl2⋅6H2O with (NH4)2CO3 at room temperature. The change in the phase composition of the products of its heat treatment in the temperature range 180–600°C is studied. It is determined by DSC/TG that the thermal decomposition occurs in two stages: the first stage occurs in the temperature range 180–215°C; the second, in the range 400–440°C. The apparent activation energies Ea of both stages of thermal decomposition are found by the model-free Kissinger method to be 62.85 and 141.86 kJ/mol, respectively. The obtained Ea values agree well with the literature data and indicate that both stages are single-step kinetic processes.
期刊介绍：
Theoretical Foundations of Chemical Engineering is a comprehensive journal covering all aspects of theoretical and applied research in chemical engineering, including transport phenomena; surface phenomena; processes of mixture separation; theory and methods of chemical reactor design; combined processes and multifunctional reactors; hydromechanic, thermal, diffusion, and chemical processes and apparatus, membrane processes and reactors; biotechnology; dispersed systems; nanotechnologies; process intensification; information modeling and analysis; energy- and resource-saving processes; environmentally clean processes and technologies.
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