Advanced Catalysts for the Chemical Recycling of Plastic Waste

Advanced Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

Abstract Plastic products bring convenience to various aspects of the daily lives due their lightweight, durability and versatility, but massive accumulation post‐consumer plastic waste is posing significant environmental challenges. Catalytic methods can effectively convert into value‐added feedstocks, with catalysts playing an important role in regulating yield selectivity products. This review explores latest advancements advanced applied thermal catalysis, microwave‐assisted photocatalysis, electrocatalysis, enzymatic catalysis reaction systems for chemical recycling valuable feedstocks. Specifically, pathways mechanisms involved plastics process are analyzed presented, strengths weaknesses employed across different described. In addition, structure‐function relationship these discussed. Herein, it provided insights design novel outline challenges future opportunities terms developing tackle “white pollution” crisis.

Language: Английский

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Synthesis and Properties of Polylactide-graft-poly(methyl methacrylate) Copolymers with Degradable Main Backbone

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

Graft copolymers of polylactide and oligo(methyl methacrylate) (PLA-g-MMA) were synthesized by atom transfer radical polymerization (ATRP) methyl methacrylate (MMA) using PLA containing 10 mol % acetal units functionalized with bromine or chlorine moieties as a multisite macroinitiator. The ultimate aim was to improve the miscibility PMMA preparing graft copolymers. MMA chosen model vinyl monomer investigate whether presented method allows synthesis required controlled topology molecular masses. First, PLA-based macroinitiators (Mn ∼ 10,000 g mol–1) obtained via cationic (co)polymerization l-LA (LA) cyclic acetals (2-bromomethyl-1,3-dioxolane─BrDXL 2-chloromethyl-1,3-dioxolane─ClDXL), carried out in presence ethylene glycol an initiator triflic acid catalyst. Subsequently, PLA-g-MMA different compositions (containing 60–80 MMA) pendant-activated groups (chlorides bromides) catalyst system consisting copper halides (CuBr CuCl) N,N,N,N″,N‴-pentamethyldiethylenetriamine (PMDETA). size exclusion chromatography (SEC) analysis revealed that PLLA-g-MMA molar mass 12,000–23,000 mol–1. Differential scanning calorimetry (DSC) all prepared only one Tg ranging from 55 82 °C, which us conclude components forming copolymer. Finally, thermal properties, susceptibility degradation, conditions for copolymeric particles investigated.

Language: Английский

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Molar mass determination via linear regression from SEC measurements: The case of polylactide, polycaprolactone and poly(2,2‐dimethylthrimethylene carbonate)

Polymers for Advanced Technologies, Journal Year: 2024, Volume and Issue: 35(1)

Published: Jan. 1, 2024

Abstract Molar mass correction coefficients (cc) were determined for calculating the absolute molar masses of polylactide (PLA), polycaprolactone (PCL), and poly(2,2‐dimethyltrimethylene carbonate) (PDTC) in range 2,5–190 kg/mol, using calibration based on polystyrene standards (PS). Linear PLAs, PCLs, PDTCs with a wide synthesized tin (II) octoate diol as catalyst/initiator system. Size Exclusion Chromatography (SEC) coupled Refractive Index detector (SEC‐RI) or Multi‐Angle Laser Light Scattering (SEC‐MALLS) was utilized to determine relative samples under investigation. Additionally, comparison, low PLA, PCL, PDTC calculated end‐group analysis 1 H NMR method. Correction subsequently by comparing obtained from SEC‐MALLS SEC‐RI. The ranged 0.40 0.87 increased rising polymers. derived equation could be used evaluate PS over broad analyzed

Language: Английский

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Chemical Upcycling of Polylactic Acid Plastic Waste into Alanine over Ru/CeO₂ with Decoration of Indium

ACS Sustainable Chemistry & Engineering, Journal Year: 2024, Volume and Issue: 12(31), P. 11754 - 11766

Published: July 21, 2024

Alanine as a versatile chemical can be synthesized by catalytic amination of biomass-derived polylactic acid (PLA) in ammonia. However, accelerating the production rate alanine with high selectivity through upcycling PLA waste remains great challenge. Herein, we proposed Ru/Ce–In-mixed metal oxide (MMO) catalysts decoration indium and found that they could efficiently facilitate into toward alanine. Among Ru/Ce–In-MMO different molar ratios Ce/In, Ru/Ce3In-MMO exhibited outstanding performance achieved an impressive yield up to 76.1% excellent 3.01 molAla·molRu–1·h–1 at 180 °C for 18 h under 0.1 MPa N2, which was remarkably higher than those individual Ru/CeO2 Ru/In2O3 catalysts. These results revealed incorporation In not only created electron-rich coordination environment stabilizing Ru particles but also reinforced interaction between Ce species, beneficial dehydrogenation, amination, hydrogenation steps interacting intermediates formed during reaction process. Most importantly, resulted ratio Ce3+/(Ce3+ + Ce4+) (28.6% vs 16.2%), plentiful oxygen vacancies (48.5% 12.7%), larger specific surface areas, stronger total basicity, collectively/synergistically improved activity Furthermore, systemic studies confirmed as-prepared recyclability without significant deactivation over three consecutive cycles. This study provides new vistas rationally design efficient sustainable waste.

Language: Английский

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Regulating Surface Acidity/Basicity by Hybrid Acid/Base Carrier for Selective Hydrogenation Isobutyraldehyde

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

Published: Feb. 6, 2025

Language: Английский

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Zinc-Oxide-Supported Zeolite Subcrystal Catalyst: Enhancing Chemical Recycling of Poly(lactic acid) via Optimized Active Site Dispersion and Polymer Diffusion

ACS Sustainable Chemistry & Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Language: Английский

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Highly selective photoreforming of plastic waste into pyruvate and coupled with hydrogen production from seawater on the defect-rich 2D/2D Cd0.5Zn0.5S/NiPS3

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 117199 - 117199

Published: May 1, 2025

Language: Английский

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Electrocatalytic Oxidation of Benzaldehyde on Gold Nanoparticles Supported on Titanium Dioxide

Nanomaterials, Journal Year: 2024, Volume and Issue: 14(12), P. 1005 - 1005

Published: June 10, 2024

The electrooxidation of organic compounds offers a promising strategy for producing value-added chemicals through environmentally sustainable processes. A key challenge in this field is the development electrocatalysts that are both effective and durable. In study, we grow gold nanoparticles (Au NPs) on surface various phases titanium dioxide (TiO2) as highly catalysts. Subsequently, samples tested oxidation benzaldehyde (BZH) to benzoic acid (BZA) coupled with hydrogen evolution reaction (HER). We observe support containing combination rutile anatase provide highest activity. excellent performance Au-TiO2 sample correlated its mixed-phase composition, large area, high oxygen vacancy content, presence Lewis active sites surface. This catalyst demonstrates an overpotential 0.467 V at 10 mA cm−2 1 M KOH solution 20 mM BZH, 0.387 100 well below (OER) overpotential. BZH not only serves OER alternative applications such electrochemical evolution, enhancing energy efficiency, but simultaneously allows generation high-value byproducts BZA.

Language: Английский

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Selective hydrogenation of biphenyl to cyclohexylbenzene over Cu based catalysts

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 498, P. 155621 - 155621

Published: Sept. 8, 2024

Language: Английский

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Alanine Production from Chemical Upcycling of Polylactic Acid Waste over Fe Doped Ru/CeO2

ChemSusChem, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Abstract Biodegradable polyesters, such as polylactic acid (PLA), is one of the most promising plastics with great potential to contribute enabling a sustainable global circular economy. However, efficient chemical upcycling PLA plastic waste into high‐value chemicals remains grand challenge. Herein, series Ru/CeFeO x catalysts varying Ru loadings were developed for catalytic amination alanine in presence ammonia. The as‐prepared exhibited exceptional activity, high selectivity, and excellent recyclability, achieving an yield 70.5 % at 180 °C 18 h, significantly surpassing previous reports. outstanding performance can be primarily attributed Fe species , which generated more oxygen vacancies, provided abundant base sites, enhanced reducibility, therefore accelerating reaction rate enhancing efficiency. This study presents alternative strategy realization

Language: Английский

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