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Natural Mg silicates with different structures and morphologies: Reaction with K to produce K2MgSiO4 catalyst for biodiesel production

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Abstract

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.

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Acknowledgements

The authors acknowledge Pedras Congonhas LTDA for the samples, the UFMG microscopy center for the images and the support of CNPQ, INCT Midas, CAPES and FAPEMIG.

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Authors and Affiliations

  1. Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil

    Fabiane Carvalho Ballotin, Mayra Nascimento, Sara Silveira Vieira, Alexandre Carvalho Bertoli, Ana Paula de Carvalho Teixeira & Rochel Montero Lago

  2. Doutorado Inovação/Mineradora Pedras Congonhas, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte-MG, Brazil

    Ottávio Carmignano

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  1. Fabiane Carvalho Ballotin
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  2. Mayra Nascimento
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  3. Sara Silveira Vieira
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  4. Alexandre Carvalho Bertoli
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  5. Ottávio Carmignano
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  6. Ana Paula de Carvalho Teixeira
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  7. Rochel Montero Lago
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Correspondence to Rochel Montero Lago.

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Ballotin, F.C., Nascimento, M., Vieira, S.S. et al. Natural Mg silicates with different structures and morphologies: Reaction with K to produce K2MgSiO4 catalyst for biodiesel production. Int J Miner Metall Mater 27, 46–54 (2020). https://doi.org/10.1007/s12613-019-1891-9

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  • DOI: https://doi.org/10.1007/s12613-019-1891-9

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