Impact of socioeconomic and sociopolitical factors on environmental sustainability in Pakistan

Environment Development and Sustainability, Год журнала: 2025, Номер unknown

Опубликована: Янв. 15, 2025

Язык: Английский

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Production of butyl levulinate from the solvolysis of high-gravity fructose over heterogeneous catalyst: In-depth kinetic modeling

Chemical Engineering Journal, Год журнала: 2023, Номер 465, С. 142914 - 142914

Опубликована: Апрель 11, 2023

Язык: Английский

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In‐Depth Investigation of the Reaction Parameters Tuning the Ethyl Levulinate Synthesis from Fructose and Inulin

ChemCatChem, Год журнала: 2024, Номер unknown

Опубликована: Апрель 19, 2024

Abstract Alkyl levulinates (ALs) are strategic compounds for the development of sustainable energy transition. In this regard, direct alcoholysis fructose and inulin selective ethyl levulinate (EL) production was investigated with a One‐Factor‐At‐a‐Time (OFAT) approach employing diluted H 2 SO 4 as catalyst to clarify role main reaction parameters (substrate acid loadings, temperature, time). The OFAT investigation on ethanolysis allowed reach EL yield 91.5 mol%. then optimized adopting multivariate based Response Surface Methodology (RSM), which highlighted interplay production. This identify optimal conditions highest (up 89.3 mol%) also those ensured concentration, substrate loading (14 wt%) higher than majority ones reported in literature according high gravity approach, lowest diethyl ether (DEE) by‐product yield. DEE formation is scarcely literature, but it can negatively influence process, thus considered work. Moreover, humin solid residue deeply characterized envisage its possible applications, under circular economy perspective.

Язык: Английский

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Experimental and Comparative Analysis on Properties and Performance of SO₃H-Functionalized Carbon Catalyst in Ethyl Levulinate Synthesis from Levulinic Acid

Catalysis Surveys from Asia, Год журнала: 2025, Номер unknown

Опубликована: Март 6, 2025

Язык: Английский

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Bio-based cellulose benzenesulfonic acid-catalyzed dehydration of fructose to 5-hydroxymethylfurfural

RSC Advances, Год журнала: 2025, Номер 15(14), С. 10511 - 10521

Опубликована: Янв. 1, 2025

The CBSA, a cellulosic-structured solid acid catalyst, was successfully synthesized and achieved 100% fructose conversion with an 85% 5-HMF yield under mild temperature conditions.

Язык: Английский

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Biocatalytic production of 3-hydroxypropionic acid precursors using a regioselective Baeyer-Villiger monooxygenase

Scientific Reports, Год журнала: 2025, Номер 15(1)

Опубликована: Апрель 22, 2025

Baeyer-Villiger monooxygenases (BVMOs) are versatile biocatalysts that catalyse the oxidation of ketones to esters with high regio- and enantioselectivity, operating under mild reaction conditions while reducing hazardous waste. Some BVMOs can convert cellulose-derived alkyl levulinates 3-acetoxypropionates (3-APs), which key intermediates in production 3-hydroxypropionic acid (3-HP), a building block chemical. In this study, BVMO from Acinetobacter radioresistens (Ar-BVMO) was tested as biocatalyst for conversion three marketed levulinates: methyl, ethyl butyl levulinate. The enzyme showed 4-fold higher catalytic efficiency (kcat/KM) enhanced regioselectivity desired 3-AP product (4:1 ratio) when using levulinate substrate. Escherichia coli whole-cells over-expressing Ar-BVMO were exploited increase yield, achieving 85% 9 h. To further improve sustainability biotransformation, obtained via microwave-assisted alcoholysis pulp, renewable cellulose feedstock, 92.7% selectivity. Despite challenges posed by poor solubility resulting mixture aqueous environment, cell lysates able fully within 24 h, efficiently producing 3-HP precursors without additional purification steps. These findings highlight feasibility chemoenzymatic approach cellulose-based raw materials platform chemicals.

Язык: Английский

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MXene Assisted Simple Recycle of Waste Cellulose Fiber with Alginate Fiber into Fireproof and Electromagnetic Interference Shielding Composite

Polymer Degradation and Stability, Год журнала: 2024, Номер 229, С. 110955 - 110955

Опубликована: Авг. 14, 2024

Язык: Английский

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Intensification of valorization of cooked rice water through energy-efficient synthesis of drop-in biofuel (butyl levulinate): engine performance, emission profile, and environmental impact assessments

Environmental Science and Pollution Research, Год журнала: 2024, Номер unknown

Опубликована: Июль 10, 2024

Язык: Английский

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Sustainable Exploitation of Posidonia oceanica Balls through an Integrated Biorefinery Approach

ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер 13(1), С. 91 - 104

Опубликована: Дек. 20, 2024

This work proposes the integrated exploitation of fibrous balls seagrass Posidonia oceanica (PO), which annually accumulate along sandy Mediterranean beaches, causing significant management and economic problems. Preliminarily, organic extractives PO were removed by ethanol, their characterization highlighted presence biologically active molecules. The successive alkaline pretreatment allowed fractionation biomass, leading to a solid enriched in polysaccharides "black liquor" containing extracted lignin. butanolysis provided yield up 52.3 mol % butyl levulinate, strategic intermediate, valuable bioblendstock for diesel. Finally, pure acid-insoluble lignin acid-soluble fractions recovered from liquor". These deeply characterized proposed as UV-blocker antioxidant agents.

Язык: Английский

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Preface: GIC2022

Catalysis Today, Год журнала: 2023, Номер 429, С. 114491 - 114491

Опубликована: Дек. 16, 2023

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