Demonstrating the Efficacy of Core-Shell Silica Catalyst in Depolymerizing Polycarbonate DOI Open Access
Onofrio Losito,

Pasquale Pisani,

Alessia De Cataldo

et al.

Polymers, Journal Year: 2024, Volume and Issue: 16(22), P. 3209 - 3209

Published: Nov. 19, 2024

Polycarbonate (PC) is a highly versatile plastic material that extensively utilized across various industries due to its superior properties, including high impact strength and heat resistance. However, durability presents significant challenges for recycling waste management. thermoplastic polymer representative of the class condensation reaction polymers obtained from bisphenol A (BPA) carbonyl source, such as phosgene or alkyl aryl carbonate. The processes PC include mechanical recycling, blending with other materials, pyrolysis, chemical recycling. latter based on cleavage carbonate units their corresponding monomers derivatives through alcoholysis and/or hydrolysis ammonolysis, normally under basic conditions without catalysts. This study investigates efficacy use several heterogeneous catalysts silica gel robust support, Sc(III)silicate (thortveitite), which has been previously reported preparation polyesters, core-shell Si-ILs, Si-ILs-ZnO, never used before in depolymerization polycarbonate, proposing sustainable efficient method this valuable polymer. We chose explore because these are recyclable, have very harsh industrial processes. were characterized by XRD; SEM_EDX, FT-IR, ICP-OES analysis. In our experimental protocol, polycarbonate samples exposed catalyst controlled (60–150 °C, 12–24 h) using both oxygen nitrogen nucleophiles. process was systematically monitored advanced analytical techniques (GC/MS GPC chromatography). results indicated exhibits efficacy, up 75% yield ammonolysis reaction, producing purity. These can be reused synthesis new contributing more approach

Language: Английский

Mg(OTf)2 as an Excellent Catalyst for the Reductive Depolymerization and Methanolysis of Polyesters and Polycarbonates DOI

Carlota M. Alfaia,

Ana C. Fernandes

Advanced Sustainable Systems, Journal Year: 2024, Volume and Issue: unknown

Published: May 15, 2024

Abstract The use of alkaline earth‐abundant metal catalysts as alternatives to transition in the depolymerization plastic waste is a very important research area. In this work, first method described for conversion polyesters into value‐added compounds catalyzed by magnesium catalyst. It demonstrated that commercially available, inexpensive and air‐stable, earth catalyst Mg(OTf) 2 efficiently promotes reductive several using pinacolborane (HBpin) reducing agent with good excellent yields. This also remains active at least 12 consecutive polycaprolactone (PCL) reactions yields between 89% 81%. efficient polycarbonate poly(bisphenol A carbonate) (PC.BPA). Furthermore, it found successfully catalyzes methanolysis polycarbonates moderate temperature

Language: Английский

Citations

5
Toward a Circular Economy of Heteroatom Containing Plastics: A Focus on Heterogeneous Catalysis in Recycling DOI
Gabriel Perli, Ion Olazabal,

Louise Breloy

et al.

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

Published: March 3, 2025

Plastics play a vital role in modern society, but their accumulation landfills and the environment presents significant risks to ecosystems human health. In addition, discarding of plastic waste constitutes loss valuable material. While usual mechanical recycling method often results reduced material quality, chemical offers exciting opportunities valorize into compounds interest. Its versatility leans on broad horizon reactions applicable, such as hydrogenolysis, hydrolysis, alcoholysis, or aminolysis. The development heterogeneous supported organocatalysts has enormous potential enhance economic industrial viability these technologies, reducing cost process mitigating its global environmental impact. This review summarizes challenges chemically heteroatom-containing plastics through catalysis, covering widely used polyesters (notably PET PLA), BPA-polycarbonate (BPA-PC), polyurethane (PU), polyamide (PA), polyether. It examines limitations various solid catalysts, including clays, zeolites, metal–organic frameworks well immobilized enzymes (heterogeneous biocatalysts), for that facilitate recovery high-value products. By reintroducing products economy precursors, this approach supports more sustainable lifecycle plastics, aligning with principles circular economy.

Language: Английский

Citations

0
Challenges and opportunities in catalytic hydrogenolysis of oxygenated plastics waste: polyesters, polycarbonates, and epoxy resins DOI Creative Commons
Harisekhar Mitta, Lingfeng Li, Mohammadhossein Havaei

et al.

Green Chemistry, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

This review comprehensively explores various homogeneous and heterogeneous catalytic systems for the hydrogenolysis of oxygenated polymeric wastes (OXPs), presenting an adaptable solution to plastic pollution generating valuable feedstock.

Language: Английский

Citations

3
Reductive Upcycling of Polyolefins, Polyesters and Mixed Plastic Wastes to Valuable Chemicals: Bridging Chemical Catalysis With Plastic Waste Management DOI Open Access
Sahil Kumar, Devanshu Sajwan, Devendra Sharma

et al.

Advanced Sustainable Systems, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Abstract The unmatched applications of plastic commodities are evident from the enormous production, reaching over 400 million tons per year in recent times. Contrastingly, lack proper management leads to a large accumulation waste, majorly including polyolefins and polyesters. Conventional methods possess significant drawbacks like cost‐ineffectiveness greenhouse gas emissions. Over last decade, chemical processes have shown promising potential for but only hold 0.1% share recycling. catalytic offer excellent protocols obtain high‐value liquid fuels, waxes, chemicals waste. This review presents an elaborate discussion on state art reductive upcycling polyolefins, polyesters, mixed initially discusses alarming statistics plastics conventional approaches followed by introduction processes. Further, various recently reported strategies been elaborated detail catalyst deactivation, technoeconomic analysis, life cycle assessment deeper understanding current this research field. Finally, detailed summary along with existing challenges countermeasures is discussed open new avenues waste research.

Language: Английский

Citations

0
Highly selective pressure-dependent (transfer) hydrogenative depolymerization of polybutylene succinate DOI
Mary L. Johnson,

Rachel L. Fine,

Dakota S. Stankowski

et al.

Chemical Communications, Journal Year: 2023, Volume and Issue: 60(6), P. 702 - 705

Published: Dec. 18, 2023

Ru-MACHO®-BH is an effective catalyst for controlled depolymerization of polybutylene succinate. Under low pressure hydrogen the produces

Language: Английский

Citations

4
Methanolysis of Plastic Waste with Manganese Compounds DOI
Daniel L. Lourenço, Ana C. Fernandes

Advanced Sustainable Systems, Journal Year: 2024, Volume and Issue: 8(11)

Published: June 27, 2024

Abstract This work describes a very efficient methodology for the methanolysis of polyester and polycarbonate plastic waste into variety valuable products using homogeneous heterogeneous manganese compounds in presence KO t Bu. Excellent yields are obtained 1 mol% catalysts Mn(OTf) 2 , Mn (CO) 10 MnBr(CO) 5 MeCpMn(CO) 3 Bu, under mild reaction conditions. The catalyst, manganese(II) ethyl/butyl phosphonate silica (Si‐Mn), also successfully promoted with excellent yields. Furthermore, this catalyst can be applied at least 12 catalytic cycles

Language: Английский

Citations

1
Hydroborative Depolymerization of Polyesters and Polycarbonates to Diols Catalyzed by Heterogeneous Lanthanum Materials La(CH2C6H4NMe2-o)3@SBA-15 DOI

Yansong Ma,

Zheyu Zhao, Jue Chen

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(38), P. 17574 - 17583

Published: Sept. 5, 2024

Chemical recycling is a promising strategy to establish circular plastic economy, and it still in an early stage of development. In this work, the reductive depolymerization polyesters polycarbonates into their corresponding borylated alcohols promoted by heterogeneous lanthanum materials was described. Grafting easily accessible tris(aminobenzyl) complex La(CH

Language: Английский

Citations

1
Reduction of sulfoxides catalyzed by the commercially available manganese complex MnBr(CO)5 DOI Creative Commons
Daniel L. Lourenço, Ana C. Fernandes

Organic & Biomolecular Chemistry, Journal Year: 2024, Volume and Issue: 22(18), P. 3746 - 3751

Published: Jan. 1, 2024

A new methodology for the reduction of a wide variety aliphatic and aromatic sulfoxides catalyzed by air-stable, cheap commercially available manganese catalyst MnBr(CO)

Language: Английский

Citations

0
Demonstrating the Efficacy of Core-Shell Silica Catalyst in Depolymerizing Polycarbonate DOI Open Access
Onofrio Losito,

Pasquale Pisani,

Alessia De Cataldo

et al.

Polymers, Journal Year: 2024, Volume and Issue: 16(22), P. 3209 - 3209

Published: Nov. 19, 2024

Polycarbonate (PC) is a highly versatile plastic material that extensively utilized across various industries due to its superior properties, including high impact strength and heat resistance. However, durability presents significant challenges for recycling waste management. thermoplastic polymer representative of the class condensation reaction polymers obtained from bisphenol A (BPA) carbonyl source, such as phosgene or alkyl aryl carbonate. The processes PC include mechanical recycling, blending with other materials, pyrolysis, chemical recycling. latter based on cleavage carbonate units their corresponding monomers derivatives through alcoholysis and/or hydrolysis ammonolysis, normally under basic conditions without catalysts. This study investigates efficacy use several heterogeneous catalysts silica gel robust support, Sc(III)silicate (thortveitite), which has been previously reported preparation polyesters, core-shell Si-ILs, Si-ILs-ZnO, never used before in depolymerization polycarbonate, proposing sustainable efficient method this valuable polymer. We chose explore because these are recyclable, have very harsh industrial processes. were characterized by XRD; SEM_EDX, FT-IR, ICP-OES analysis. In our experimental protocol, polycarbonate samples exposed catalyst controlled (60–150 °C, 12–24 h) using both oxygen nitrogen nucleophiles. process was systematically monitored advanced analytical techniques (GC/MS GPC chromatography). results indicated exhibits efficacy, up 75% yield ammonolysis reaction, producing purity. These can be reused synthesis new contributing more approach

Language: Английский

Citations

0