Y zeolite-supported niobium pentoxide catalysts for the glycerol acetalization reaction

Ferreira, Cristiana; Araujo, Angelo; Casilda, Vanesa Calvino; Cutrufello, Maria Giorgia; Rombi, Elisabetta; Fonseca, A.; Bañares, Miguel Á.; Neves, Isabel C.

doi:10.1016/j.micromeso.2018.06.010

Cited by 42 publications

(30 citation statements)

References 38 publications

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“…In addition, the presence of the metal ions and the acidic environment of the zeolite structure induce the generation of the reactive oxygen species that can damage DNA, protein, and cell membranes . However, the cellular mechanism for antimicrobial action of silver nanoparticles is not fully understood, but it is currently accepted that target proteins in the membrane and cytoplasm attack the respiratory chain, induce oxidative stress, and lead to cell death. , Moreover, it seems that bacteria are less prone to develop resistance against silver–zeolite materials than against conventional antibiotics, making these materials an alternative to antibiotics to control bacterial infections. Therefore, it is of high interest to perform further research on the action mechanisms of these metal ion–zeolite materials as it might open up a way to find new approaches to control MRSA infections.…”

Section: Resultsmentioning

confidence: 99%

Metal Ion–Zeolite Materials against Resistant Bacteria, MRSA

Peixoto

Guedes

Rombi

et al. 2021

Ind. Eng. Chem. Res.

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Metal ion–zeolite materials based on different zeolite structuresFAU (NaY, 100–750 nm), LTA (4400 nm), and MFI (ZSM5, >100, 760, and 2500 nm) were studied for developing antimicrobial agents using a simple method. These zeolite structures were loaded with silver, copper, or zinc ions using an ion-exchange method and tested for antimicrobial activity against three bacteriaEscherichia coli, methicillin-sensitive Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus (MRSA), a clinical isolate. Sample characterization confirmed the presence of metal ions and the stability of the zeolite structures. All mono- and bimetallic ion–zeolite materials loaded with silver displayed higher antimicrobial activity than zinc- or copper-containing samples. The inhibitory effect of metal ion–zeolite materials was even higher than the action of antibiotics, especially against MRSA. These findings show that silver ion–zeolite materials have potential applications to combat bacterial infections and further prevent the prevalence of resistant microorganisms. The antimicrobial activity seems to be related to the acidity and Si/Al ratio of zeolites, according to the following scale: MFI > FAU > LTA. Particularly, the inhibitory effect against MRSA is a very promising result considering the difficulty of effective eradication of this resistant strain, the principal agent of nosocomial or healthcare-associated infections, which affect 3.2% of all hospitalized patients in the United States and 6.5% in the European Union.

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Section: Resultsmentioning

confidence: 99%

Metal Ion–Zeolite Materials against Resistant Bacteria, MRSA

Peixoto

Guedes

Rombi

et al. 2021

Ind. Eng. Chem. Res.

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“…Finally, the third generation is solvent free glycerol acetalization reaction by heterogeneous catalysts in batch or continuous processes. In fact, new heterogeneous catalysts are active enough to push the catalytic process to produce desired products (solketal) at high reaction conversion even without solvent (Chen et al, 2018a ; Ferreira et al, 2018 ). In this regard, different types of heterogeneous acid catalysts have been recently applied in the acetalization of various carbonyl compounds with glycerol such as activated carbons, montmorillonite (MMT), zeolites, metal-based catalysts, ionic liquids, supported multi-walled carbon nano-tubes (MWCNTs) or, mesoporous silicates with arylsulphonate group, heteropoly acids, rare-earth triflates, and ion-exchange resins.…”

Section: Catalytic Acetalization Of Glycerolmentioning

confidence: 99%

A Review on the Catalytic Acetalization of Bio-renewable Glycerol to Fuel Additives

et al. 2018

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The last 20 years have seen an unprecedented breakthrough in the biodiesel industry worldwide leads to abundance of glycerol. Therefore, the economic utilization of glycerol to various value-added chemicals is vital for the sustainability of the biodiesel industry. One of the promising processes is acetalization of glycerol to acetals and ketals for applications as fuel additives. These products could be obtained by acid-catalyzed reaction of glycerol with aldehydes and ketones. Application of different supported heterogeneous catalysts such as zeolites, heteropoly acids, metal-based and acid-exchange resins have been evaluated comprehensively in this field. In this review, the glycerol acetalization has been reported, focusing on innovative and potential technologies for sustainable production of solketal. In addition, the impacts of various parameters such as application of different reactants, reaction temperature, water removal, utilization of crude-glycerol on catalytic activity in both batch and continuous processes are discussed. The outcomes of this research will therefore significantly improve the technology required in tomorrow's bio-refineries. This review provides spectacular opportunities for us to use such renewables and will consequently benefit the industry, environment and economy.

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“…9−12 Among these, the acetalization of glycerol with acetone yields solketal, which has numerous applications like a fuel additive, solvent, and plasticizer and in the pharmaceutical industry as a suspension agent. 13 Additionally, solketal is reported to improve the properties of biofuel in terms of octane boosting. 14 Moreover, solketal blending will help reduce emissions and improve fuel efficiency.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Ferreira et al reported the acetalization of glycerol with acetone over Nb-impregnated Y and USY zeolites. 13 The Nb-Y-zeolite catalyst was observed to be inactive due to diffusion limitations. Recently, WOx/MCM-41 is reported for the acetalization of pure glycerol with 87% yield for solketal.…”

Section: ■ Introductionmentioning

confidence: 99%

Sustainable Upgrade of Bioderived Glycerol to Solketal through Acetalization over Metal-Free Mordenite Catalysts

Saini

Tathod

Saxena

et al. 2022

ACS Sustainable Chem. Eng.

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In the current work, acetalization of crude glycerol to produce valuable solketal, a renewable fuel additive, is studied over metal-free mordenite-based catalysts. The perfect combination of the appropriate acidity and suitable porosity is required to achieve optimum solketal yield from glycerol. The property–activity correlation was established through various physicochemical characterizations, and reaction parameters were optimized to maximize the solketal yield. The modified mordenite catalyst showed exceptionally high catalytic activity toward the acetalization of crude glycerol and as high as 99% yield of solketal was achieved under mild reaction conditions, i.e., a reaction temperature of 60 °C, a time of 4 h, and atmospheric pressure. The catalyst showed tolerance for water and other impurities present in crude glycerol in addition to excellent recyclability up to three cycles without any regeneration treatment. The economical, easy-to-prepare, recyclable, metal-free, moisture-tolerant nature of the catalyst makes it a promising catalyst candidate to be used at a larger scale. The catalytic process has the potential to utilize crude glycerol obtained from biodiesel plants for the synthesis of biofuel additives solketal. This highlights the industrial and environmental significance of this work.

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Y zeolite-supported niobium pentoxide catalysts for the glycerol acetalization reaction

Cited by 42 publications

References 38 publications

Metal Ion–Zeolite Materials against Resistant Bacteria, MRSA

Metal Ion–Zeolite Materials against Resistant Bacteria, MRSA

A Review on the Catalytic Acetalization of Bio-renewable Glycerol to Fuel Additives

Sustainable Upgrade of Bioderived Glycerol to Solketal through Acetalization over Metal-Free Mordenite Catalysts

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