Kinetics of methyl esters production with dimethyl carbonate over niobium phosphate

Alessio, C.; Ribeiro, Jéssica Souza; Celante, Dian; Brondani, Leoni N.; Castilhos, Fernanda de

doi:10.1016/j.enconman.2017.09.010

Cited by 22 publications

(21 citation statements)

References 43 publications

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“…This behavior may suggest that since the present system is solvent free, the use of larger amounts of catalyst does not lead to a greater probability of access to the catalytic sites and does not results in significant gains in terms of conversion or selectivity. Similar behaviors have been reported previously using different catalysts …”

Section: Resultssupporting

confidence: 91%

Evaluation of Esterification of Oleic Acid and Glycerol in the Presence of Organotin(IV) Compounds

Silva¹,

Santos²,

Neto³

et al. 2019

Euro J Lipid Sci & Tech

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Esterification of oleic acid (OA) and glycerol (GLY) is studied in the absence and in the presence of the organotin(IV) catalysts (CAT) dibutyltin dichloride (Bu2SnCl2), butyltin trichloride (BuSnCl3), dibutyltin dilaurate (Bu2SnLau2), butyl stannoic acid (BuSnO(OH)), and di‐n‐butyl‐oxo‐stannane (Bu2SnO). The reactivity order observed at 180 °C using a OA/GLY/CAT molar ratio of 1/1/0.01 was BuSnCl3 > Bu2SnLau2 > Bu2SnCl2 > Bu2SnO > BuSnO(OH), and a kap of −0.6237 h−1 is obtained for BuSnCl3. The estimated activation energy for the conversion reaction of OA at the above molar ratio using BuSnCl3 is 60.9 kJ mol−1, whereas it is 71.3 kJ mol−1 for the reaction performed without the catalyst. Moreover, the most active catalytic systems are those that act as typical and pure Lewis acids, and the least active systems are those that follow the ligand exchange mechanism, suggesting that GLY and AO are involved in the ligand exchange process and may form less reactive catalytic species. Practical Applications: In order to expand the glycerol utilization, the aim of the present work is to systematically investigate the behavior of organotin(IV) compounds bearing different substituents on the metal center (oxo, carboxyl, chloro, and hydroxy groups) in the esterification of OA and GLY without a solvent for obtaining MAGs, DAGs and TAGs. Best results of esterification of AO + GLY are attained at 180 °C using BuSnCl3 as a catalyst, and the kap = −0.6237 h−1 for OA conversion is obtained.

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Section: Resultssupporting

confidence: 91%

Evaluation of Esterification of Oleic Acid and Glycerol in the Presence of Organotin(IV) Compounds

Silva¹,

Santos²,

Neto³

et al. 2019

Euro J Lipid Sci & Tech

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“…Bassan et al 25 reported that lauric acid conversion increased with temperature in the esterification reaction. The same behaviour was found in the work of Alessio et al 26 and Aranda et al 38 . Regarding catalyst concentration, the reports of Alessio et al 26 , Ribeiro et al 16 and Jiang et al 39 have shown that conversion increased with catalyst content.…”

Section: Experimental Designsupporting

confidence: 88%

“…The same behaviour was found in the work of Alessio et al 26 and Aranda et al 38 . Regarding catalyst concentration, the reports of Alessio et al 26 , Ribeiro et al 16 and Jiang et al 39 have shown that conversion increased with catalyst content. According to Lam et al 40 , by increasing the catalyst content, more active sites would be available for the reaction, and thus higher conversions would be achieved.…”

Section: Experimental Designsupporting

confidence: 88%

Assessment of niobium phosphate as heterogeneous catalyst in esterification with methyl acetate

Alves

Pinheiro

Brondani

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The aim of this work was to investigate the esterification reaction from oleic acid with methyl acetate (MeA) catalyzed by niobium phosphate to produce methyl esters. This catalyst has an amorphous structure and large surface area. Catalytic tests were performed according to an experimental design. The results were analyzed statistically and all of the variables were significant, especially the temperature. RESULTS A kinetic study of the reaction was carried out and the most suitable reaction conditions were 240 °C, 10% (m/m) of catalyst and MeA: oleic acid molar ratio 10:1. After 2 h, it was possible to obtain ≈80% (m/m) methyl oleate content. A noncatalytic test corroborated niobium phosphate activity in the reaction. A kinetic model fitted experimental data for the catalyzed and noncatalyzed reactions; kinetics parameters for Arrhenius equation were estimated. In a reuse test, the catalyst showed a gradual decrease in catalytic activity over five reaction cycles. CONCLUSION Niobium phosphate can be considered as a promising heterogeneous catalyst for biodiesel synthesis. © 2019 Society of Chemical Industry

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“…Comparing the textural properties of the NBO and NBP catalysts, it can be observed that both have practically the same specific areas and pore volume sizes. The specific areas obtained for the commercial NBP and NBO shows that these values are higher than those presented by other references [45,[52][53][54][55][56], probably because these catalysts were not submitted to calcination. These values can decrease when the catalysts are submitted to different pretreatment temperatures and distinct preparation methods [52,57].…”

Section: Catalyst Propertiescontrasting

confidence: 63%

“…NBP, due to the presence of Lewis and Brønsted acid sites, besides having high catalytic activity for the alkylation of anisole, showed high selectivity for monoalkylated products. Alessio et al [45] evaluated NBP in the esterification reaction to produce biodiesel from oleic acid and low-cost raw materials. The temperature was the determining variable for higher conversions to FFA (80 %), with the best condition being at 250°C, with 3 h of reaction, 5 % of NBP, and a molar ratio of 1:5.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Soybean Oil Hydrolysis on Niobium Catalysts

et al. 2020

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The catalytic hydrolysis of soybean oil was used as an alternative for the production of monoglycerides (MG) and diglycerides (DG). The reactions were conducted in a stainless-steel tubular reactor in the temperature range of 240-290°C, on niobium phosphate (NBP) and niobium oxide (NBO) as catalysts. In the hydrolysis reactions at 270°C, the maximum selectivities of the products of interest were obtained at 22 % MG and 48 % DG for the reaction with NBP, and 7 % MG and 33 % DG with NBO, for 59 % and 36 % of triglyceride conversion in 10 min, respectively. The proposed kinetic model presented a good fit of the theoretical model with the experimental data, showing that the previous hypotheses considered for the mechanism development are suitable for describing the kinetics of soybean oil hydrolysis.

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Kinetics of methyl esters production with dimethyl carbonate over niobium phosphate

Cited by 22 publications

References 43 publications

Evaluation of Esterification of Oleic Acid and Glycerol in the Presence of Organotin(IV) Compounds

Evaluation of Esterification of Oleic Acid and Glycerol in the Presence of Organotin(IV) Compounds

Assessment of niobium phosphate as heterogeneous catalyst in esterification with methyl acetate

Kinetics of Soybean Oil Hydrolysis on Niobium Catalysts

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