Natural Mg silicates with different structures and morphologies: Reaction with K to produce K<sub>2</sub>MgSiO<sub>4</sub> catalyst for biodiesel production

Fabiane Carvalho Ballotin; Mayra Nascimento; Sara Silveira Vieira; Alexandre Carvalho Bertoli; Ottávio Carmignano; Ana Paula de Carvalho Teixeira; Rochel Montero Lago

doi:10.1007/s12613-019-1891-9

Volume 27 Issue 1

Jan. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(1): 46-54

Fabiane Carvalho Ballotin, Mayra Nascimento, Sara Silveira Vieira, Alexandre Carvalho Bertoli, Ottávio Carmignano, Ana Paula de Carvalho Teixeira, and Rochel Montero Lago, Natural Mg silicates with different structures and morphologies: Reaction with K to produce K₂MgSiO₄ catalyst for biodiesel production, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp. 46-54. https://doi.org/10.1007/s12613-019-1891-9

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Fabiane Carvalho Ballotin, Mayra Nascimento, Sara Silveira Vieira, Alexandre Carvalho Bertoli, Ottávio Carmignano, Ana Paula de Carvalho Teixeira, and Rochel Montero Lago, Natural Mg silicates with different structures and morphologies: Reaction with K to produce K2MgSiO4 catalyst for biodiesel production, Int. J. Miner. Metall. Mater., 27(2020), No. 1, pp. 46-54. https://doi.org/10.1007/s12613-019-1891-9

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Research Article

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

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Corresponding author:
Rochel Montero Lago E-mail: rochel@ufmg.br
Received: 28 April 2019; Revised: 1 August 2019; Accepted: 8 August 2019; Available online: 19 December 2019

Abstract

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 K₂MgSiO₄ 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 K₂MgSiO₄ 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 K₂MgSiO₄.
- silicate;
- serpentinite;
- lizardite;
- antigorite;
- talc;
- chrysotile;
- biodiesel

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