Catalytic performance and ultrasonic-assisted impregnation effects on WO3/USY zeolites in esterification of oleic acid with methyl acetate

Ketzer, Felipe; Celante, Dian; Castilhos, Fernanda de

doi:10.1016/j.micromeso.2019.109704

Cited by 37 publications

(24 citation statements)

References 78 publications

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“…No leaching of the active tungsten species was found during the reaction, revealing the high catalyst stability. The catalytic efficiency of WO 3 (Lewis acid) combined with a microporous zeolite (USY, Brønsted acid) was tested for oleic acid esterification with methyl acetate. , WO 3 species partially blocked the Brønsted acid sites of USY by blocking micropores that control the accessibility of the reactants to mesoporous cavities. Compared with a conventional wet-impregnation method, the ultrasonic-assisted activation improved the catalyst’s performance, giving about 79 and 80 wt % conversions over 10% and 20% WO 3 /USY catalysts.…”

Section: Catalytic Applications Of Supported Moo X and Wo X Solid A...mentioning

confidence: 99%

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

et al. 2021

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Supported molybdenum oxide (MoO x ) and tungsten oxide (WO x ) materials are a vital class of solid acid catalysts for the chemical industry because of their nontoxic nature, strong acidity, remarkable stability in water, hydrogen, and oxygen atmospheres, and excellent reusability performance. These fascinating solid acids play a pivotal role in developing sustainable catalytic routes for renewable biomass processing to produce value-added fuels, chemicals, and platform molecules. The coordination chemistry of MoO x and WO x on the support materials (oxides, carbons, or zeolites) controls their acidic strength, active site accessibility, and catalytic activity. Hence, significant efforts have been made toward optimizing the conditions used for catalyst synthesis and biomass processing to tune the coordination chemistry of MoO x and WO x with the substrate molecules and, thus, their acid-activity/selectivity performance. This Review provides a comprehensive overview of supported MoO x and WO x solid acids for biomass valorization. The importance of the biomass and the role of solid acids for biomass valorization were emphasized, followed by a brief discussion of supported MoO x and WO x solid acids. Afterward, the interplay of coordination chemistry, acidic strength, and catalytic activity of supported MoO x and WO x solid acids was discussed. Finally, their catalytic applications for the valorization of several biomass substrates and their derivatives were summarized. This Review will provide valuable insights for developing advanced supported WO x and MoO x solid acids for catalytic biomass valorization and other challenging acid-catalyzed processes.

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Section: Catalytic Applications Of Supported Moo X and Wo X Solid A...mentioning

confidence: 99%

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

et al. 2021

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“… 24 There are a few reports on ultrasound-assisted impregnation of metal precursors on FAU zeolite. 12 , 25 Rakmae et al used ultrasound-assisted impregnation to prepare 12 wt % potassium on NaY from potassium acetate buffer. 12 The catalyst provided a better biodiesel yield than that from a conventional impregnation.…”

Section: Introductionmentioning

confidence: 99%

“…The catalyst exhibited a high dispersion of active species with strong interaction over the support and provided a good performance. 25 …”

Section: Introductionmentioning

confidence: 99%

Comparative Properties of K/NaX and K/NaY from Ultrasound-Assisted Impregnation and Performance in Transesterification of Palm Oil

et al. 2022

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This work aims to compare physicochemical properties and catalytic performance of potassium supported on zeolite NaX and NaY (K/NaX and K/NaY, respectively) prepared by ultrasound-assisted impregnation from potassium acetate buffer precursor. Calcination converts the potassium precursor to carbonate, which occupies the zeolite cavities and disperses on the external surface. Both calcined samples show a decrease in zeolite phases, BET surface areas, and pore volumes. With the smaller changes, K/NaX is more stable than K/NaY. Moreover, K/NaX has higher basicity than K/NaY and is more active in the decomposition of 2-methylbut-3-yn-2-ol (MBOH), producing dominant products from basic sites. Both K/NaX and K/NaY are active in the transesterification of palm oil, producing more than 94% of the biodiesel yields in the first run. However, the yields drop in the second run because of the leaching of potassium species into glycerol and biodiesel products. The spent K/NaX has a similar phase to the fresh one, whereas the spent K/NaY shows more structure collapse. With better structural stability, less potassium leaching, and less decline in biodiesel yields in the second run, K/NaX is a better catalyst than K/NaY.

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“…Approximately 90% of biodiesel is generated via transesterification of refined feedstocks, that contain low free fatty acid (FFAs) and water, and alcohols aided by homogeneous acid or alkaline catalyst. 4 There are also a few instances on biodiesel production using biocatalysts such as immobilised enzyme on solid surface 5 under mild reaction temperature with the drawbacks of considerable processing time, high production cost and short catalyst lifespan, despite the high selectivity for transesterification reaction. Methanol-aided catalytic transesterification is the typical technique employed for the biodiesel production since methanol is easily accessible and relatively cheap.…”

Section: Introductionmentioning

confidence: 99%

“…10 Heterogeneous acid catalysis in glycerol-free methyl acetate-assisted interesterification had not been thoroughly investigated by any researchers to the best of the authors' knowledge. Ketzer et al 4 applied tungsten oxide-activated USY zeolite in the interesterification of oleic acid, whereas Alves et al 11 studied the same process using niobium phosphate. Alessio et al 12 had also employed niobium phosphate in the biodiesel synthesis between oleic acid and dimethyl carbonate.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of glycerol‐free fatty acid methyl ester using interesterification reaction based on solid acid carbon catalyst derived from low‐cost biomass wastes

Wong

Lim

Pang

et al. 2020

Intl J of Energy Research

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The current research was aimed to corroborate as well as compare the feasible applicability of waste banana peel and empty fruit bunch (EFB) in synthesising high-performing heterogeneous catalysts. The solid acid catalysts originated from biomass wastes were employed for the synthesis of glycerol-free fatty acid methyl ester (FAME) using catalytic interesterification process pathway. Acetic acid was produced as the by-product instead of glycerol. The heterogeneous acid catalysts were synthesised utilising sulphuric acid through direct sulfonation with thermal treatment. The concentration of the sulphuric acid was manipulated from 2 to 13 mol L −1 to investigate its effects on the resulting FAME yield while maintaining the sulfonating ratio at 10 mL g −1 . The catalytic performances of the as-synthesised catalysts were studied under reaction conditions of 12 wt % catalyst loading, 50:1 methyl acetate to oleic acid molar ratio for a duration of 8 hours at 60 C. The catalyst produced by activated carbon derived from EFB and sulfonated with 13 mol L −1 sulphuric acid exhibited the highest FAME yield at 44.3%. The parameter studies on reactant ratio (45:1-70:1), reaction temperature (90 C-130 C) and time (4-24 hours) of interesterification reaction discovered a general increasing trend in the FAME yield up to 52.3% with the optimum conditions of 50:1, 110 C and 8 hours, respectively. The catalyst was recyclable with 82% of the catalytic performance retained after five successive cycles with catalyst reactivation. This study confirmed that the renewable heterogeneous catalyst derived from biomass waste This paper is an extended and revised article presented at the

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Catalytic performance and ultrasonic-assisted impregnation effects on WO3/USY zeolites in esterification of oleic acid with methyl acetate

Cited by 37 publications

References 78 publications

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Comparative Properties of K/NaX and K/NaY from Ultrasound-Assisted Impregnation and Performance in Transesterification of Palm Oil

Synthesis of glycerol‐free fatty acid methyl ester using interesterification reaction based on solid acid carbon catalyst derived from low‐cost biomass wastes

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Catalytic performance and ultrasonic-assisted impregnation effects on WO3/USY zeolites in esterification of oleic acid with methyl acetate

Cited by 37 publications

References 78 publications

Supported MoOx and WOx Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Supported MoOx and WOx Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Comparative Properties of K/NaX and K/NaY from Ultrasound-Assisted Impregnation and Performance in Transesterification of Palm Oil

Synthesis of glycerol‐free fatty acid methyl ester using interesterification reaction based on solid acid carbon catalyst derived from low‐cost biomass wastes

Contact Info

Product

Resources

About

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis

Supported MoO_x and WO_x Solid Acids for Biomass Valorization: Interplay of Coordination Chemistry, Acidity, and Catalysis