Investigation of the catalytic activity of niobium phosphates for liquid phase alkylation of anisole with benzyl chloride

Cruz, Marcus Henrique Campino de la; Rocha, Ângela Sanches; Lachter, Elizabeth R.; Forrester, Aline M.S.; Reis, Michele C.; Gil, Rosane A. S. San; Caldarelli, Stéfano; Farias, Andrea D.; Gonzalez, Wilma A.

doi:10.1016/j.apcata.2010.07.030

Cited by 26 publications

(9 citation statements)

References 29 publications

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“…1. There was no occurrence of any diffraction peak, indicating that this material is amorphous, as described previously in the literature 25,29,30 .…”

Section: Catalyst Propertiessupporting

confidence: 78%

“…Bands at 3440 and 1625 cm −1 are assigned to the bending vibration and stretching vibration of the (OH) bond in absorbed water and coordinated water . According to La Cruz et al , bands around 1220 and 1020 cm −1 may be related to stretching vibrations of (P=O) groups and vibrations of (NbO) and (Nb=O) groups appear around 640–585 and 910 cm −1 . The vibration bands of the niobium phosphate used are similar to the results obtained by Rocha et al in the study with microporous niobium phosphate.…”

Section: Resultsmentioning

confidence: 98%

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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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“…1. There was no occurrence of any diffraction peak, indicating that this material is amorphous, as described previously in the literature 25,29,30 .…”

Section: Catalyst Propertiessupporting

confidence: 78%

Section: Resultsmentioning

confidence: 98%

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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“…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: 64%

“…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]. Armaroli [53] and Ziolek [54] found specific areas in the ranges of 27-132 and 150-180 m 2 g -1 for NBO and NBP, respectively.…”

Section: Catalyst Propertiescontrasting

confidence: 64%

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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“…There are many reports on the solid acid catalyzed alkylation of aromatics with alcohol, [28][29][30][31] alky halides, [32,33] and ethers. [34] Examples of solid acid catalysts are inorganic fluoride, [28] Nb 2 O 5 -WO x nano fiber, [29] niobium phosphate, [32] gallosilicate, [33] sulfated zirconia supported on MCM-41, [34] zirconium pillar clays, [35] Zr-SBA-15, [36] Ga-, Al-, AlGA-SBA-15, [37] and heteropolyacids (HPAs) and their salts. [30,31,38] The metal-oxygen clusters of the early transition metals in their highest oxidation states, also known as polyoxometalates are a significant class of inorganic compounds with potential applications in catalysis.…”

Section: Introductionmentioning

confidence: 99%

Samarium‐exchanged Heteropoly Tungstate: An Efficient Solid Acid Catalyst for the Synthesis of Glycerol Carbonate from Glycerol and Benzylation of Anisole

et al. 2012

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Samarium‐exchanged heteropoly tungstate (SmxTPA) is an efficient catalyst for the synthesis of glycerol carbonate from glycerol and urea. The catalysts with varying Sm content were prepared and characterized by FT‐IR spectroscopy, XRD, laser Raman spectroscopy, temperature‐programmed desorption of ammonia, and X‐ray photo electron spectroscopy. The activity of the catalysts is related to the Lewis and Brønsted acidity, which depends on the Sm content in the catalysts. Partially exchanged SmxTPA catalyst showed high activity, owing to a higher number of Lewis acidic sites. The catalyst exhibited consistent activity and selectivity during recycling. A plausible reaction mechanism is presented. The catalyst also exhibited high activity in the acid‐catalyzed benzylation of anisole.

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Investigation of the catalytic activity of niobium phosphates for liquid phase alkylation of anisole with benzyl chloride

Cited by 26 publications

References 29 publications

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

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

Kinetics of Soybean Oil Hydrolysis on Niobium Catalysts

Samarium‐exchanged Heteropoly Tungstate: An Efficient Solid Acid Catalyst for the Synthesis of Glycerol Carbonate from Glycerol and Benzylation of Anisole

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