Depolymerization of HDPE to wax in the presence of a catalyst formed by homonuclear macrocyclic zirconium complex chemically bonded to alumina support

Lal, Sunder; Anisia, K.S.; Kumar, Arvind

doi:10.1016/j.apcata.2006.01.016

Cited by 13 publications

(2 citation statements)

References 25 publications

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“…Moreover, oligomeric side products or degraded dyes can also be afforded, which impact the polymer properties and make laborious separation processes necessary. Metal-based metal complexes have been recently studied as homogeneous catalysts, especially to catalyse the C–C bond cleavage in PP, LDPE and HDPE plastics [ 105 , 106 ]. These catalysts are often expensive, air-sensitive, feature a reduced selectivity towards low molecular weight degradation products, and their large-scale manufacturer is also far from being environmentally friendly.…”

Section: Mofs For Mps/nps Degradationmentioning

confidence: 99%

Metal-organic frameworks and plastic: an emerging synergic partnership

Mastropietro

2023

Science and Technology of Advanced Materials

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Mismanagement of plastic waste results in its ubiquitous presence in the environment. Despite being durable and persistent materials, plastics are reduced by weathering phenomena into debris with a particle size down to nanometers. The fate and ecotoxicological effects of these solid micropollutants are not fully understood yet, but they are raising increasing concerns for the environment and people’s health. Even if different current technologies have the potential to remove plastic particles, the efficiency of these processes is modest, especially for nanoparticles. Metal-organic frameworks (MOFs) are crystalline nano-porous materials with unique properties, have unique properties, such as strong coordination bonds, large and robustus porous structures, high accessible surface areas and adsorption capacity, which make them suitable adsorbent materials for micropollutants. This review examines the preliminary results reported in literature indicating that MOFs are promising adsorbents for the removal of plastic particles from water, especially when MOFs are integrated in porous composite materials or membranes, where they are able to assure high removal efficiency, superior water flux and antifouling properties, even in the presence of other dissolved co-pollutants. Moreover, a recent trend for the alternative preparation of MOFs starting from plastic waste, especially polyethylene terephthalate, as a sustainable source of organic linkers is also reviewed, as it represents a promising route for mitigating the impact of the costs deriving from the widescale MOFs production and application. This connubial between MOFs and plastic has the potential to contribute at implementing a more effective waste management and the circular economy principles in the polymer life cycle.

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Section: Mofs For Mps/nps Degradationmentioning

confidence: 99%

Metal-organic frameworks and plastic: an emerging synergic partnership

Mastropietro

2023

Science and Technology of Advanced Materials

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“…It allows better control of the hydrocarbon products distribution and reduces the processing temperature, [7,8] resulting in reduced energy consumption. Different studies have been performed using different catalysts, including organometallics [9,10], but mostly with solid acids, and particularly with zeolites [11][12][13][14][15].…”

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confidence: 99%

Using simultaneous DSC/TG to analyze the kinetics of polyethylene degradation—catalytic cracking using HY and HZSM-5 zeolites

Coelho

Costa

Marques

et al. 2009

Reac Kinet Mech Cat

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High-density polyethylene (HDPE) was cracked over HZSM-5 and HY zeolites and the reaction was followed using simultaneous thermogravimetry (TG) and differential scanning calorimetry (DSC) and was compared with the degradation of the same material in the absence of an added catalyst. The products obtained in the degradation reaction were analyzed by gas chromatography. The simultaneous use of the signals from the TG and DSC allowed an accurate description of the thermal and catalytic degradation of the polymer by application of a novel kinetic model that correlates the two signals that are measured. The kinetic parameters were estimated by fitting this model to the experimental data obtained by TG and DSC. For both zeolites, the polymer degradation takes place at lower temperatures when compared with pure thermal degradation. It was also observed that the two zeolites have a distinct influence on the product distribution.

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Epilogue: Sorting, Depolymerizing, and Recycling Polymers: The Long Road to a Circular Plastics Economy

Gnanou

2022

Macromolecular Engineering

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After Hermann Staudinger laid the foundations of polymer science 100 years ago, an extraordinary scientific, technological, and industrial saga has been written by a long list of academic and industrial scientists. As a result, polymers are present in practically all sectors of human activity, transforming human societies in terms of quality of life, safety, hygiene, etc. Yet the expansion in the production and use of polymeric materials comes at a price for the environment because the polymer economy has been organized since its inception under the “ take, make, dispose ” pattern. Such a linear organization of the polymer economy causes considerable damages to the environment, wastes resources, and harms wildlife. This article discusses the steps that need to be taken worldwide to turn a still linear polymer economy into a circular one. Questions such as the sorting of polymer waste, their mechanical recycling, their recycling through nonchemical processes, the depolymerization of some polymers into monomers, the pyrolysis of nondegradable polymers, the potential of biodegradation processes are critically reviewed. Recommendations are made in this article to dramatically reduce the carbon footprint of the whole production chain from monomer synthesis to the manufacture of polymers and build a truly circular polymer economy with reuse, repair, and recycle as its foundations.

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Depolymerization of HDPE to wax in the presence of a catalyst formed by homonuclear macrocyclic zirconium complex chemically bonded to alumina support

Cited by 13 publications

References 25 publications

Metal-organic frameworks and plastic: an emerging synergic partnership

Metal-organic frameworks and plastic: an emerging synergic partnership

Using simultaneous DSC/TG to analyze the kinetics of polyethylene degradation—catalytic cracking using HY and HZSM-5 zeolites

Epilogue: Sorting, Depolymerizing, and Recycling Polymers: The Long Road to a Circular Plastics Economy

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