Synthesis of biodiesel and acetins by transesterification reactions using novel CaSn(OH)6 heterogeneous base catalyst​

Sandesh, Swetha; Kristachar, Prashant Kumar R; Manjunathan, Pandian; Halgeri, A. B.; Shanbhag, Ganapati V.

doi:10.1016/j.apcata.2016.05.006

Cited by 38 publications

(20 citation statements)

References 34 publications

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“…This was attributed to further conversion of mono-and diacetin to triacetin during the acetylation. Similarly, SO To save cost in biodiesel production, transesterification of methyl acetate with glycerol was carried out to produce acetin simultaneously with the biodiesel using Ca and Sn mixed metal hydroxides as catalyst [126]. CaSn(OH) 6 catalyst performed much better when compared to other hydroxy stannates and metal oxides like MgSn(OH) 6 , ZnSn(OH) 6 , SrSn(OH) 6 , Ca(OH) 2 , CaO, MgO, etc.…”

Section: Acetin (Glycerol Esters)mentioning

confidence: 99%

An Overview of Recent Research in the Conversion of Glycerol into Biofuels, Fuel Additives and other Bio-Based Chemicals

et al. 2018

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The depletion of fossil fuels has heightened research and utilization of renewable energy such as biodiesel. However, this has thrown up another challenge of significant increase in its byproduct, glycerol. In view of the characteristics and potentials of glycerol, efforts are on the increase to convert it to higher-value products, which will in turn improve the overall economics of biodiesel production. These high-value products include biofuels, oxygenated fuel additives, polymer precursors and other industrial bio-based chemicals. This review gives up-to-date research findings in the conversion of glycerol to the above high-value products, with a special focus on the performance of the catalysts used and their challenges. The specific products reviewed in this paper include hydrogen, ethanol, methanol, acetin, glycerol ethers, solketal, acetal, acrolein, glycerol carbonate, 1,3-propanediol, polyglycerol and olefins.

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Section: Acetin (Glycerol Esters)mentioning

confidence: 99%

An Overview of Recent Research in the Conversion of Glycerol into Biofuels, Fuel Additives and other Bio-Based Chemicals

et al. 2018

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“…For MgSn(OH) 6 , absorption peaks in the range 3000-3500 cm −1 were ascribed to O-H stretching vibration modes and lattice modes at 1175 cm −1 corresponded to the O-H bending vibrations. Peaks in the range of 500-1000 cm −1 were attributed to the Mg-O and Sn-O bond stretching vibration modes [29]. All of the main characteristic peaks of MgSn(OH) 6 and SnO 2 were observed in MSOH-SO.…”

Section: Resultsmentioning

confidence: 95%

In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline

Tian

Wang

et al. 2019

Nanomaterials

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Using solar energy to remove antibiotics from aqueous environments via photocatalysis is highly desirable. In this work, a novel type-II heterojunction photocatalyst, MgSn(OH)6/SnO2, was successfully prepared via a facile one-pot in situ hydrothermal method at 220 °C for 24 h. The obtained heterojunctions were characterized via powder X-ray diffraction, Fourier-transform infrared spectroscopy, transmission electron microscopy, and ultraviolet-visible diffuse reflectance spectroscopy. The photocatalytic performance was evaluated for photodegradation of tetracycline solution under ultraviolet irradiation. The initial concentration of tetracycline solution was set to be 20 mg/L. The prepared heterojunctions exhibited superior photocatalytic activity compared with the parent MgSn(OH)6 and SnO2 compounds. Among them, the obtained MgSn(OH)6/SnO2 heterojunction with MgCl2·6H2O:SnCl4·5H2O = 4:5.2 (mmol) displayed the highest photocatalytic performance and the photodegradation efficiency conversion of 91% could be reached after 60 min under ultraviolet irradiation. The prepared heterojunction maintained its performance after four successive cycles of use. Active species trapping experiments demonstrated that holes were the dominant active species. Hydroxyl radicals and superoxide ions had minor effects on the photocatalytic oxidation of tetracycline. Photoelectrochemical measurements were used to investigate the photocatalytic mechanism. The enhancement of photocatalytic activity could be assigned to the formation of a type-II junction photocatalytic system, which was beneficial for efficient transfer and separation of photogenerated electrons and holes. This research provides an in situ growth strategy for the design of highly efficient photocatalysts for environmental restoration.

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“…14 Acetins can be typically obtained either by esterification of acetic acid with glycerol in the presence of a solid acid catalyst [14][15][16] or by transesterification of an alkyl acetate with glycerol in the presence of a basic catalyst. 17 Sodium aluminate (NaAlO 2 ) belongs to a class of super base solid materials; it finds diverse applications in paper industry, water treatment and as a precursor for zeolite synthesis. 18 With the idea to exploit the superior basic properties of sodium aluminate, it was recently tested as a heterogeneous catalyst for a range of base-catalysed organic transformations (transesterification, carboxymethylation, isomerization, etc.)…”

Section: Introductionmentioning

confidence: 99%

Highly Basic Solid Catalyst Obtained by Spray Drying of a NaAlO2 and Boehmite Suspension for the Upgrading of Glycerol to Acetins

Ramesh¹,

Amoura²,

Debecker³

2020

Preprint

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In here, we present the low-cost production of NaAlO 2 -Al 2 O 3 catalysts, which exhibit high activity in the transesterification of methyl acetate with glycerol to obtain acetins. The catalyst preparation procedure is based on the spray drying of a colloidal boehmite suspension, supplemented with a sodium aluminate (NaAlO 2 ) solution using a pilot scale spray drier. Upon subsequent calcination, we obtain spherical micro particles presenting a homogeneous dispersion of sodium aluminate and featuring high basicity. The NaAlO 2 loading has a marked impact on the basicity and textural properties of the final materials. These solids are found to be efficient heterogeneous base catalysts for the upgrading of glycerol (which is essentially a waste) to glycerol acetins (which are important bio-based fuel additives). With 100 mg of the catalyst loaded with 20 wt.% of NaAlO 2 , a conversion of 96 % is obtained after 4 h of reaction at 60 °C (10 mmol of glycerol + 100 mmol of methyl acetate). Importantly, the selectivity for triacetin is as high as 20 % (the rest being 50 % of diacetin and 30 % of monoacetin). The catalysts act strictly in a heterogeneous way and are recyclable.

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Synthesis of biodiesel and acetins by transesterification reactions using novel CaSn(OH)6 heterogeneous base catalyst

Cited by 38 publications

References 34 publications

An Overview of Recent Research in the Conversion of Glycerol into Biofuels, Fuel Additives and other Bio-Based Chemicals

An Overview of Recent Research in the Conversion of Glycerol into Biofuels, Fuel Additives and other Bio-Based Chemicals

In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline

Highly Basic Solid Catalyst Obtained by Spray Drying of a NaAlO2 and Boehmite Suspension for the Upgrading of Glycerol to Acetins

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Synthesis of biodiesel and acetins by transesterification reactions using novel CaSn(OH)6 heterogeneous base catalyst​

Cited by 38 publications

References 34 publications

An Overview of Recent Research in the Conversion of Glycerol into Biofuels, Fuel Additives and other Bio-Based Chemicals

An Overview of Recent Research in the Conversion of Glycerol into Biofuels, Fuel Additives and other Bio-Based Chemicals

In Situ Construction of a MgSn(OH)6 Perovskite/SnO2 Type-II Heterojunction: A Highly Efficient Photocatalyst towards Photodegradation of Tetracycline

Highly Basic Solid Catalyst Obtained by Spray Drying of a NaAlO2 and Boehmite Suspension for the Upgrading of Glycerol to Acetins

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Synthesis of biodiesel and acetins by transesterification reactions using novel CaSn(OH)6 heterogeneous base catalyst