Colombian clays binary mixtures: physical changes due to thermal treatments
| Autor: | Marcela Martínez-Tejada, Manuel A. Domínguez-Ortiz, Santiago Betancourt-Parra |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Pore size
inorganic chemicals Materials science 010504 meteorology & atmospheric sciences 020101 civil engineering mezclas binarias de arcillas 02 engineering and technology montmorillonite 01 natural sciences complex mixtures 0201 civil engineering Catalysis Temperature treatment physical changes of clays Thermal montmorillonita Thermal analysis 0105 earth and related environmental sciences bentonite General Engineering Sorption binary mixtures of clays bentonita colombian clays cambios físicos de arcillas arcillas colombianas esmécticas Chemical engineering Clay minerals BET theory |
| Zdroj: | DYNA, Volume: 87, Issue: 212, Pages: 73-79, Published: MAR 2020 Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Usually, smectite clays, which are used for catalytic purposes, are subjected to chemical and thermochemical treatments to enhance their surface features. This research aims to analyze textural and structural features of the physical mixtures of two Colombian smectite clays at room temperature and after the treatment at 600°C, 800°C, and 1000°C. The physical mixtures of two Colombian clays were characterized by X-ray techniques, thermal analysis, and BET surface area to evaluate physical changes resulting from the three thermal treatments. The results showed the appearance of microstructural changes in basal spacing and other crystals minerals because of the loss of carbonates and alkaline oxides in the clays. Additionally, a dramatic reduction in surface area features was evidenced by the temperature increase. Simultaneously, an increase in the pore size was also observed because of the increase of the temperature treatment. The results reveal that the physical mixture is not an appropriate solution to enhance the textural properties of the Colombian clays for sorption or catalytic purposes. |
| Databáze: | OpenAIRE |
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