Structural and acidity analysis of heteropolyacids supported on faujasite zeolite and its effect in the esterification of oleic acid and n-butanol

Paiva, Mateus Freitas; Freitas, Elon Ferreira de; França, Juliene Oliveira Campos de; Valadares, Deborah da Silva; Dias, Sílvia C.L.; Dias, José A.

doi:10.1016/j.mcat.2022.112737

Cited by 6 publications

(3 citation statements)

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“…Paiva et al [149] have shown an interesting association of HPA and zeolites for catalysis. Therefore, zeolite Y (faujasite, Si/Al = 2.5) was changed by the incipient impregnation of HPW and HSiW forming x% HPA/Y (x = 3, 6, and 12 wt.%), i.e., low loadings to improve the interaction between the phases and avoid leaching.…”

Section: Catalystmentioning

confidence: 99%

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

et al. 2023

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It has been about 36 years since the first published paper about the calorimetry and adsorption (Cal-Ad) method by Prof. Drago. These separated methods are very old and important characterization tools for different molecules and materials, as recognized in chemistry. The idea of coupling these two techniques arose from the need to have more information about the thermodynamic parameters of a catalyst. The Cal-Ad method provides a measure of the magnitude (Ki), strength (−∆Hi), and quantity (ni) of sites present in a catalyst. The original idea is based on the application of the donor-acceptor concept using the Electrostatic Covalent Model, ECW in the areas of catalysis and material chemistry. Particularly, enthalpy measurements of acidity are directly related to the activity of various catalysts in a variety of reactions. Currently, more than twenty-five catalysts have been carefully characterized by this method in addition to spectroscopic and other thermal methods. Thus, this review seeks to present the fundamentals of the method and show different applications of the characterized catalysts for a variety of reactions in order to use these data as an alternative to choose a catalyst for an acid-dependent type reaction.

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Section: Catalystmentioning

confidence: 99%

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

et al. 2023

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“…In particular, the Keggin structure HPAs have garnered significant attention as potential multifunctional catalyst candidates, which can be owed largely to their exceptional stability and strong acidity. − Nonetheless, these catalysts present difficulties in separating from the product, largely due to their low specific surface area and high solubility in polar solvents, necessitating the use of solid support to immobilize HPAs . In recent years, researchers have investigated the effect of heteropolyacid loading using various carriers, such as metal–organic frameworks, zeolites, and metal oxides, in esterification reactions. Compared to liquid protic acid, metal oxide solid acid has both advantages of a solid catalyst and acid, including easy separation and strong acidity .…”

Section: Introductionmentioning

confidence: 99%

A General Strategy for Efficient Upgrading of Biomass-Derived Rice Husk Vinegar with ZrO₂ Supported HSiW Catalyst: Extractive Coupling Esterification

Shi,

Jiang,

Yang

et al. 2024

Energy Fuels

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Rice husk vinegar, a byproduct of biomass pyrolysis, can be refined to increase its value and reduce harmful emissions. This study synthesized a range of HSiW solid acid catalysts supported by ZrO 2 using impregnation and investigated the esterification of rice husk vinegar, a biomass pyrolysis liquid rich in acetic acid. The catalytic esterification experiment was performed on an extraction coupling esterification reaction device to enrich acetic acid and improve conversion. The physicochemical characterization of catalysts verified their improved catalytic performance with an increased calcined temperature, as it amplifies the Brønsted/Lewis ratio. Esterification results indicated that the 30-HZ (300) catalyst underwent a conversion of 94.02%, at the temperature of 130 °C, alcohol-to-liquid ratio of 0.5, catalyst dose of 3 wt %, and reaction period of 4 h. The catalyst retained 91% of its conversion at the fifth cycle. The catalyst facilitated the conversion of most short-chain organic acids to esters, some oxidation of n-butanol and ketones, and the etherification of n-butanol. These results are beneficial for the high-value transformation and application of rice husk vinegar and future research on biomass pyrolytic liquids.

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“…In contrast, heterogeneous catalysts (e.g., zeolites, heteropolyacids, metal oxides, etc.) have attracted growing interest owing to their low pollution and easy recovery ( Woo et al, 2021 ; Zhang et al, 2022b ; Paiva et al, 2022 ; Ul Islam et al, 2022 ). However, high-efficiency separation of the catalyst from the liquid phase and reduction of catalyst loss remain challenges.…”

Section: Introductionmentioning

confidence: 99%

Advancement in utilization of magnetic catalysts for production of sustainable biofuels

Zhang

Wang

et al. 2023

Front. Chem.

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In this study, we summarize recent advances in the synthesis of magnetic catalysts utilized for biodiesel production, particularly focusing on the physicochemical properties, activity, and reusability of magnetic mixed metal oxides, supported magnetic catalysts, ionic acid-functionalized magnetic catalysts, heteropolyacid-based magnetic catalysts, and metal–organic framework-based magnetic catalysts. The prevailing reaction conditions in the production of biodiesel are also discussed. Lastly, the current limitations and challenges for future research needs in the magnetic catalyst field are presented.

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Structural and acidity analysis of heteropolyacids supported on faujasite zeolite and its effect in the esterification of oleic acid and n-butanol

Cited by 6 publications

References 61 publications

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

A General Strategy for Efficient Upgrading of Biomass-Derived Rice Husk Vinegar with ZrO₂ Supported HSiW Catalyst: Extractive Coupling Esterification

Advancement in utilization of magnetic catalysts for production of sustainable biofuels

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Structural and acidity analysis of heteropolyacids supported on faujasite zeolite and its effect in the esterification of oleic acid and n-butanol

Cited by 6 publications

References 61 publications

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

Liquid Phase Calorimetric Method as a Tool for Acid Strength Measurements and Application to a Variety of Sustainable Catalysts

A General Strategy for Efficient Upgrading of Biomass-Derived Rice Husk Vinegar with ZrO2 Supported HSiW Catalyst: Extractive Coupling Esterification

Advancement in utilization of magnetic catalysts for production of sustainable biofuels

Contact Info

Product

Resources

About

A General Strategy for Efficient Upgrading of Biomass-Derived Rice Husk Vinegar with ZrO₂ Supported HSiW Catalyst: Extractive Coupling Esterification