Preparation of Hydrotalcite–Hydroxyapatite Material and Its Catalytic Activity for Transesterification of Soybean Oil

Brasil, Henrique; Pereira, Patrícia; Corrêa, José Augusto Martins; Nascimento, Luís Adriano Santos do; Rumjanek, Víctor Marcos; Almeida, Vitória de Cássia Félix de; Coral, Natasha; Rodrigues, Elizabeth

doi:10.1007/s10562-016-1961-9

Cited by 21 publications

(7 citation statements)

References 28 publications

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“…Um reator Parr ® 4871 foi carregado com óleo de soja Siol ® e metanol P.A. (99,9%) nas seguintes condições reacionais: temperatura de reação (180 e 240 °C), razão metanol:óleo (12:1), carga de catalisador (2,5% p/p em relação a massa de óleo) e agitação constante de 700 rpm [15]. Transcorrido o tempo de reação, o produto foi filtrado a vácuo a fim de separar o catalisador sólido.…”

Section: Methodsunclassified

“…A pesquisa no campo da ciência dos materiais visa estabelecer combinações e modificações que possibilitem uma vasta aplicação de novos materiais em diferentes áreas do conhecimento. Recentemente, a síntese de um material composto pelas fases hidrotalcita e hidroxiapatita (HTHAp) foi proposta e seu desempenho avaliado na transesterificação de óleo de soja e no tratamento de água [14][15][16]. Ademais, uma das formas mais recentes de reforço e funcionalização de matrizes inorgânicas é a utilização de nanotubos de carbono (NTC), que consistem em uma estrutura tubular formada a partir de folhas de grafeno que apresentam alta versatilidade em termos de propriedades mecânicas, elétricas e térmicas, além possibilitar um bom incremento nas propriedades estruturais de uma gama de materiais [17][18][19].…”

Section: (Synthesis and Characterization Of Hydrotalcite-hydroxyapatiunclassified

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Síntese e caracterização do material hidrotalcita-hidroxiapatita dopado com nanotubos de carbono e sua aplicação na catálise da reação de transesterificação

et al. 2018

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Resumo Este trabalho teve por objetivo a síntese e caracterização do material hidrotalcita-hidroxiapatita (HTHAp) dopado com três diferentes proporções (1, 5 e 15% p/p) de nanotubos de carbono (NTC) a fim de avaliar seu potencial como catalisador heterogêneo na reação de metanólise do óleo de soja. A síntese do material HTHAp foi realizada pelo método de coprecipitação (10≤pH≤11) com homogeneização ultrassônica e tratamento hidrotérmico a 80 °C. DRX, MEV/EDS, FT-IR, Raman, fisissorção de N2 e TG/DTA foram as técnicas de caracterização utilizadas. A amostra HTHAp1NTC, dopada a 1% p/p, foi testada como catalisador em duas condições de temperatura (180 e 240 °C), 4 h de tempo de reação, carga de 2,5% de catalisador e razão álcool:óleo de 12:1. A dopagem contribuiu para melhorar propriedades estruturais, morfológicas e a estabilidade térmica do material. Os resultados de rendimento obtidos de 35,2% (180 °C) e 40,5% (240 °C) qualificam o material HTHAp dopado com NTC como catalisador em potencial na reação de transesterificação.

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Section: Methodsunclassified

Section: (Synthesis and Characterization Of Hydrotalcite-hydroxyapatiunclassified

Síntese e caracterização do material hidrotalcita-hidroxiapatita dopado com nanotubos de carbono e sua aplicação na catálise da reação de transesterificação

et al. 2018

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“…They as well act as an anchoring site for metal nanoparticles (NPs). [31][32][33][34][35][36][37] It is difficult to separate the catalysts based on HT from the reaction medium by conventional centrifugation and filtration separation methods. [35] Using a magnetic separation approach is a suitable technique [38] that can be applied using a simple magnetic bar when magnetic nanoparticles (MNPs) are incorporated into the HT structure.…”

Section: Introductionmentioning

confidence: 99%

Effective and selective aerobic oxidation of primary and secondary alcohols using CoFe₂O₄@HT@Imine‐Cu^II and TEMPO in the air atmosphere

Salimi

Esmaeli-nasrabadi

Sandaroos

2020

Applied Organom Chemis

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In this study, we present a versatile and easy procedure for modifying a cobalt ferrite nanoparticle step by step. A new nanocatalyst was prepared via Cu II immobilized onto CoFe 2 O 4 @HT@Imine. The catalyst was fully characterized by Fourier-transform infrared (FT-IR), energy-dispersive X-ray spectroscopy (EDX), field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and vibrating sample magnetometer (VSM) analyses. The current procedure as a green protocol offers benefits including a simple operational method, an excellent yield of products, mild reaction conditions, minimum chemical wastes, and short reaction times. Without any significant reduction in the catalytic performance, up to five recyclability cycles of the catalyst were obtained. The optimization results suggest that the best condition in the oxidation of benzyl alcohol derivatives is 0.003 g of the CoFe 2 O 4 @HT@Imine-Cu II catalyst, TEMPO, at 70 C under solvent-free condition and air.

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“…The Mg-Al mixed oxides which are chemically active sites for use in catalytic reactions and also act as the anchoring sites for metal nanoparticles. [27][28][29][30][31][32][33][34] On the other hand, the separation of hydrotalcite based catalysts from the reaction mixture is difficult to some extent, [27] replacement of conventional separation methods (centrifugation and filtration) with magnetic separation approaches is a fascinating technique. Thus, the incorporation of magnetic nanoparticles (MNPs) into the hydrotalcite structure [35,36] provides easy separation of catalysts from the reaction mixture using an external magnetic and also prevents MNP agglomeration.…”

Section: Introductionmentioning

confidence: 99%

“…The Mg‐Al mixed oxides which are chemically active sites for use in catalytic reactions and also act as the anchoring sites for metal nanoparticles. [ 27–34 ]…”

Section: Introductionmentioning

confidence: 99%

Green synthesis of the 1‐substituted 1H‐1, 2, 3, 4‐tetrazoles over bifunctional catalyst based on copper intercalated into Mg/Al hydrotalcite modified magnetite nanoparticles

Salimi

Zamanpour

2020

Applied Organom Chemis

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An effective one-pot, convenient process for the synthesis of 1-substituted 1Htetrazoles from triethyl orthoformate, amines, and sodium azide is described using copper (II) doped and immobilized on functionalized magnetic hydrotalcite (Fe 3 O 4 /HT-NH 2 Cu II) as a novel recyclable catalyst. The application of this catalyst allows the synthesis of a variety of tetrazoles in good to excellent yields in water. The new catalyst was characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), thermogravimetric analysis (TGA), vibration sample magnetometry (VSM) and inductively coupled plasma analysis (ICP-OES). This new procedure offers several advantages such as short operational simplicity, practicability, and applicability to various substrates and the absence of any tedious workup or purification. The loading amount of Cu II (doped and immobilized) on functionalized magnetic hydrotalcite was indicated to be 4.66 mmol g −1 , obtained from the ICP-OES analysis. Also, the excellent catalytic performance, thermal stability, and separation of the catalyst make it an excellent heterogeneous system and a useful alternative to other heterogeneous catalysts. Also, the catalyst could be magnetically separated and reused six times without significant loss of catalytic activity.

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Preparation of Hydrotalcite–Hydroxyapatite Material and Its Catalytic Activity for Transesterification of Soybean Oil

Cited by 21 publications

References 28 publications

Síntese e caracterização do material hidrotalcita-hidroxiapatita dopado com nanotubos de carbono e sua aplicação na catálise da reação de transesterificação

Síntese e caracterização do material hidrotalcita-hidroxiapatita dopado com nanotubos de carbono e sua aplicação na catálise da reação de transesterificação

Effective and selective aerobic oxidation of primary and secondary alcohols using CoFe₂O₄@HT@Imine‐Cu^II and TEMPO in the air atmosphere

Green synthesis of the 1‐substituted 1H‐1, 2, 3, 4‐tetrazoles over bifunctional catalyst based on copper intercalated into Mg/Al hydrotalcite modified magnetite nanoparticles

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Preparation of Hydrotalcite–Hydroxyapatite Material and Its Catalytic Activity for Transesterification of Soybean Oil

Cited by 21 publications

References 28 publications

Síntese e caracterização do material hidrotalcita-hidroxiapatita dopado com nanotubos de carbono e sua aplicação na catálise da reação de transesterificação

Síntese e caracterização do material hidrotalcita-hidroxiapatita dopado com nanotubos de carbono e sua aplicação na catálise da reação de transesterificação

Effective and selective aerobic oxidation of primary and secondary alcohols using CoFe2O4@HT@Imine‐CuII and TEMPO in the air atmosphere

Green synthesis of the 1‐substituted 1H‐1, 2, 3, 4‐tetrazoles over bifunctional catalyst based on copper intercalated into Mg/Al hydrotalcite modified magnetite nanoparticles

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Effective and selective aerobic oxidation of primary and secondary alcohols using CoFe₂O₄@HT@Imine‐Cu^II and TEMPO in the air atmosphere