4.8 Review

Recent Progress in the Chemical Upcycling of Plastic Wastes

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Summary: By catalytic hydrogenolysis using a Ru/Nb2O5 catalyst, various aromatic plastic wastes containing C-O and/or C-C linkages can be upgraded to arenes, presenting a new approach to addressing the environmental impact of plastic waste.

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Soosan Kim et al.

Summary: The study explores the effects of CO2 and HZSM-11 catalyst on the pyrolytic products of waste teabags, showing that their synergistic use enhances the production of caprolactam, a value-added nylon monomer. The conversion of CO2 into CO during catalytic pyrolysis was greater compared to non-catalytic pyrolysis, highlighting the potential of upcycling everyday waste such as waste teabags through the synergistic employment of HZSM-11 catalyst and CO2 pyrolysis medium.

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Xi Chen et al.

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Non-thermal plasma-assisted hydrogenolysis of polyethylene to light hydrocarbons

Libo Yao et al.

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Transformation of Corn Lignin into Sun Cream Ingredients

Jie Yang See et al.

Summary: The production of value-added chemicals from lignocellulose, using a synthetic approach to produce p-methoxy coumarate esters from waste corn stover and corn bran, has been developed as an important strand of the emerging bio-economy. Through mild alkaline hydrolysis of corn waste, p-coumaric acid and ferulic acid are released at yields exceeding 20 mg g(-1) (10 wt % based on lignin content). Solid acid catalysts, such as Amberlite IR-15, show promising catalytic performance in the esterification of pCA with various alcohols, with the catalyst being recyclable with slight activity loss. Further transformation of these compounds into consumer products is achieved through base-catalyzed methylation and transesterification reactions.

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Catalytic methods for chemical recycling or upcycling of commercial polymers

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Sibel Ugduler et al.

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