Novel Catalytic Process for the Conversion of Biomass Waste into 5-Hydroxymethylfurfural on a Sn-Doped Carbon Catalyst

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 20, 2025

This work presents an experimental holistic approach for the design of a continuous catalytic conversion process carbohydrates derived from waste biomass to 5-hydroxymethylfurfural (5-HMF) using tin-doped active carbon catalyst. In this report, apple is used as model component feed. demonstrates synergistic benefit catalyst performance integrated with various steps increase 5-HMF yield by instead considering isolated piece within process. A detailed layout presented, and parameters have been investigated systematically optimize biomass. The extraction components such enzymes pomace 20 v % n-butanol after milling was found be essential pretreatment procedure stable substantially improving yield. optimum reaction conditions respect temperature, contact time, regeneration were well feasibility apply downstream membrane filtration clean product stream removing humins. To efficiency, addition hydrolyzed pulp filter cake reactant feed investigated. spent Sn-doped catalysts analyzed techniques, N2 physisorption, X-ray fluorescence, diffraction, ammonia-temperature-programmed desorption, thermogravimetric analysis.

Language: Английский

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Ceramic Nanotubes—Conducting Polymer Assemblies with Potential Application as Chemosensors for Breath Ammonia Detection in Chronic Kidney Disease

Chemosensors, Journal Year: 2024, Volume and Issue: 12(9), P. 198 - 198

Published: Sept. 23, 2024

This paper describes the process of producing chemosensors based on hybrid nanostructures obtained from Al2O3, as well ZnO ceramic nanotubes and following conducting polymers: poly(3-hexylthiophene), polyaniline emeraldine-base (PANI-EB), poly(3, 4-ethylenedioxythiophene)-polystyrene sulfonate. The for creating involves three steps: polymer fiber nets using poly(methyl methacrylate), depositing films onto nanofiber magnetron deposition, heating to 600 °C burn off support completely. technology obtaining polymers is drop-casting. AFM analysis emphasized a higher roughness, mainly in case PANI-EB, both nanotube types, with much larger grain size dimension over 5 μm. values parameter Rku were close or slightly above 3, indicating, all cases, formation layers predominantly characterized by peaks not depressions, Gaussian distribution. An ink-jet printer was used generate chemiresistors PANI-EB structures, metallization made commercial copper ink printed electronics. Calibration curves experimentally generated sensing structures across wider range NH3 concentrations air, reaching up ppm. A 0.5 ppm detection limit established. curve ZnO:PANI-EB structure presented high linearity lower resistance values. sensor could be medical diagnosis breath ammonia biomarkers predicting CKD stages than 1. threshold value 1 represents feasible sensor, which can defined simple, low-value robust device individual use, beneficial at patient level.

Language: Английский

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Nitrile Furanics via Copper‐Catalyzed Dehydration of Aldoximes and Knoevenagel Condensation

European Journal of Organic Chemistry, Journal Year: 2024, Volume and Issue: 27(20)

Published: Feb. 28, 2024

Abstract In this work two synthetic approaches to introduce nitrile moieties into bio‐based derived furanic compounds were investigated, i. e., dehydration of aldoximes and Knoevenagel condensation. Both methodologies have been first tested optimized on furfural thus exploited 5‐hydroxymethyl‐2‐furfural (HMF) 5,5’‐oxy(bismethylene)‐2‐furaldehyde (OBMF). The syntheses furfural, HMF OBMF efficiently conducted (also in large scale) under mild reaction conditions short time. subsequent was carried out the presence catalytic amount copper acetate monohydrate. Furthermore, condensations performed with different Activated Methylene Group compounds, using for first‐time dimethyl carbonate as media. Most resulting products isolated pure via simple liquid‐liquid extraction good excellent yields. Future applications these might include aldoxime reduction amine furanics ‐ herein also preliminary investigated hydrolysis derivatives related carboxylic acid (or ester) furanics. All are interesting monomers preparation polymers.

Language: Английский

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A fast response colorimetric sensor based on food color for ammonia detection

Emergent Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Aug. 13, 2024

Language: Английский

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