Natural Mg silicates with different structures and morphologies: Reaction with K to produce K2MgSiO4 catalyst for biodiesel production
| Autor: | Rochel Montero Lago, Ana Paula C. Teixeira, Ottávio Carmignano, Sara Silveira Vieira, Alexandre C. Bertoli, Mayra Aparecida Nascimento, Fabiane Carvalho Ballotin |
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| Rok vydání: | 2020 |
| Předmět: |
Biodiesel
Mechanical Engineering Intercalation (chemistry) Metals and Alloys Transesterification Talc Silicate Catalysis chemistry.chemical_compound chemistry Chemical engineering Geochemistry and Petrology Mechanics of Materials Biodiesel production Materials Chemistry medicine Methanol medicine.drug |
| Zdroj: | International Journal of Minerals, Metallurgy and Materials. 27:46-54 |
| ISSN: | 1869-103X 1674-4799 |
| DOI: | 10.1007/s12613-019-1891-9 |
| Popis: | In this work, different magnesium silicate mineral samples based on antigorite, lizardite, chrysotile (which have the same general formula Mg3Si2O5(OH)4), and talc (Mg3Si4O10(OH)2) were reacted with KOH to prepare catalysts for biodiesel production. Simple impregnation with 20wt% K and treatment at 700-900°C led to a solid-state reaction to mainly form the K2MgSi04 phase in all samples. These results indicate that the K ion can diffuse into the different Mg silicate structures and textures, likely through intercalation in the interlayer space of the different mineral samples followed by dehydroxylation and K2MgSi04 formation. All the materials showed catalytic activity for the transesterification of soybean oil (1:6 of oil: methanol molar ratio, 5wt% of catalyst, 60°C). However, the best results were obtained for the antigorite and chrysotile precursors, which are discussed in terms of mineral structure and the more efficient formation of the active phase K2MgSi04. |
| Databáze: | OpenAIRE |
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