Esterification of oleic acid using 12-tungstophosphoric supported in flint kaolin of the Amazonia

Junior, Orivaldo da Silva Lacerda; Cavalcanti, Rodrigo Marinho; Matos, Thaisa Moreira de; Angélica, Rômulo Simões; Filho, Geraldo Narciso da Rocha; Barros, Ivoneide de Carvalho Lopes

doi:10.1016/j.fuel.2013.01.008

Cited by 36 publications

(25 citation statements)

References 25 publications

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“…The removal of those Keggin units was necessary to avoid their leaching in the liquid medium during the reaction. In this manner, the measurement of the HPMo in the Soxhlet washing solvent made it also possible to indirectly estimate the amount of HPMo efficiently immobilized [20,21,51]. By spectroscopic analysis of ultraviolet-visible spectroscopy (UV-vis) the quantities of HPMo were estimated in the recovered ethanol after extraction and thus, by difference, the quantities of HPMo that were effectively incorporated in the matrices BC and BL [20,21,51].…”

Section: Methodsmentioning

confidence: 99%

“…The calibration curves were constructed at the wavelength 310 nm (λ max ) [54], analyzing the solution of HPMo in ethanol at known concentrations (Figure 1a). Based on literature [20,21,51], the masses of HPMo immobilized in the supports were determined.…”

Section: Methodsmentioning

confidence: 99%

“…However, they are unsuitable for esterification because of their high solubility in polar media [15,16,17]. An alternative to overcome this problem could be to support these heteropolyacids on a solid with a high surface area, such as MCM and SBA [9,18,19], metakaolin [9,20], Zirconia [21,22], montmorillonite [13,16,23,24,25,26] and others.…”

Section: Introductionmentioning

confidence: 99%

“…In another paper, Pires et al [9] impregnated 12-tungstophosphoric (HPW) in a waste kaolin and mesoporous materials (MCM and SBA) obtaining acid catalysts that have been applied to the esterification of DDPO with maximum activity of 83% conversion. Lacerda Junior et al [20] used 12-tungstophosphoric impregnated in Amazon kaolin flint, resulting in a series of catalysts that were tested in the esterification of oleic acid resulting in 97.21% of conversion. H 3 PW 12 O 40 and Cs x H 3− x PW 12 O 40 have been supported on SiO 2 , MCM-41 and ZrO 2 that were prepared and applied as solid acid catalysts for the esterification of palm free fatty acids with methanol in a yield of 92% in methyl esters [15].…”

Section: Introductionmentioning

confidence: 99%

“…The catalytic effects of PAHs in acidic reactions depends on three factors: acidity, heteropolianion structure and the type of reaction. On the other hand, clays may be used as catalyst support [9,13,16,20,25,26,34,41,44], or act as acid catalysts [7,8,38,39], redox catalysts and in removing heavy metals from the environment from modifications [45,46]. Both the modified-bentonite and bentonite are promising supports due to their common fascinating features, such as their inherent acidity, excellent thermal stability, and easily controlled structure and morphology.…”

Section: Introductionmentioning

confidence: 99%

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Bentonites Modified with Phosphomolybdic Heteropolyacid (HPMo) for Biowaste to Biofuel Production

et al. 2019

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Two bentonites from Paraíba (Northeastern Brazil) were impregnated with heteropoly phosphomolybdic H3PMo12O40 (HPMo). The materials produced were characterized by various techniques such as N2 adsorption-desorption (specific surface area, SSA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA/DTG), Scanning Electron Microscopy (SEM) equipped with Dispersive Energy X-ray spectroscopy (EDS), ultraviolet-visible spectroscopy (UV-vis), acid-base titration analysis. The catalytic activity of these materials was tested in the esterification of a waste from palm oil deodorization and the main results obtained (about 93.3% of conversion) indicated that these materials have potential to act as heterogeneous solid acid catalysts. The prepared materials exhibited satisfactory catalytic performance even after a very simple recycling process in three reuse cycles, without significant loss of their activities.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bentonites Modified with Phosphomolybdic Heteropolyacid (HPMo) for Biowaste to Biofuel Production

et al. 2019

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In situ impregnation of cobalt‐doped tungstophosphoric acid on MOF‐801 toward enhanced catalytic activity for esterification

Zhang,

Hu,

Chen

et al. 2024

Applied Organom Chemis

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Development of an energy‐efficient and economical route is necessary for society to synthesize green biofuels. Herein, cobalt‐doped tungstophosphoric acid (Co‐HPW) is in‐situ impregnated in the Zr‐based metal–organic framework (MOF‐801) forming composite of Co‐HPW/MOF‐801. The chemical composition, morphology, and acidic sites of the Co‐HPW/MOF‐801 composite were analyzed through x‐ray diffractometer (XRD), Fourier transform infrared (FTIR), scanning electron microscope (SEM), energy‐dispersive x‐ray spectroscopy (EDS), thermogravimetric analysis (TG), N2 physisorption, ammonia temperature‐programmed desorption (NH3‐TPD), pyridine‐adsorbed infrared spectra (Py‐FTIR), and x‐ray photoelectron spectroscopy (XPS). The catalytic performance of the as‐synthesized catalyst was explored to catalyze esterification of lauric acid (LA) with methanol. The outcomes revealed that the Co‐HPW/MOF‐801 nanocatalyst achieved a high conversion of 86.3% under the optimized reaction condition (catalyst amount of 0.15 g, temperature of 100°C, time of 4 h, and methanol/LA molar ratio of 20:1). The excellent catalytical performance is mainly due to the large BET surface area, exposure of more active centers from available pore structure, and simultaneous possession of high Lewis and Brønsted acidity. Furthermore, the kinetic study revealed that the reaction process was kinetically controlled and the activation energy was found to be 42.1 kJ/mol. The results suggest that the synthesized Co‐HPW/MOF‐801 nanocatalyst is an environmental greenness, low cost, and suitable for easy scale‐up for the production of biofuels.

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Fabrication of a Dendritic Heteropolyacid as Self‐Separated, Water‐Resistant Catalyst for Biodiesel Fuel Production

Duan

Sun

et al. 2015

Energy Tech

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The catalytic, electrocatalytic, or photocatalytic conversion of CO2 into useful chemicals in high yield for industrial applications has so far proven difficult. Herein, we present our work on the electrochemical reduction of CO2 in seawater using a boron‐doped diamond (BDD) electrode under ambient conditions to produce formaldehyde. This method overcomes the usual limitation of the low yield of higher‐order products, and also reduces the generation of H2. In comparison with other electrode materials, BDD electrodes have a wide potential window and high electrochemical stability, and, moreover, exhibit very high Faradaic efficiency (74 %) for the production of formaldehyde, using either methanol, aqueous NaCl, or seawater as the electrolyte. The high Faradaic efficiency is attributed to the sp3‐bonded carbon of the BDD. Our results have wide ranging implications for the efficient and cost‐effective conversion of CO2.

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Esterification of oleic acid using 12-tungstophosphoric supported in flint kaolin of the Amazonia

Cited by 36 publications

References 25 publications

Bentonites Modified with Phosphomolybdic Heteropolyacid (HPMo) for Biowaste to Biofuel Production

Bentonites Modified with Phosphomolybdic Heteropolyacid (HPMo) for Biowaste to Biofuel Production

In situ impregnation of cobalt‐doped tungstophosphoric acid on MOF‐801 toward enhanced catalytic activity for esterification

Fabrication of a Dendritic Heteropolyacid as Self‐Separated, Water‐Resistant Catalyst for Biodiesel Fuel Production

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