Glycerol valorization: The effect of Cu on the HZSM5 catalyst structure and increased selectivity towards allyl alcohol

Vargas, B.; Vicenti, Juliano Rosa de Menezes; Silva, Edilene Deise da; Pinto, Alexandre H.; Gorup, Luiz Fernando; Rosa, Claudio; Mortola, Vanessa Bongalhardo

doi:10.1016/j.cherd.2023.06.061

Cited by 2 publications

(1 citation statement)

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“…Acetins including monoacetin, diacetin, and triacetin are widely used for cosmetics, pharmaceuticals, food additives, and biodiesel additives . The average price of glycerol stands at 350 USD/mt, but its conversion into acetins can elevate its value significantly, ranging from 1000 to 2000 USD/mt. , The conversion of glycerol into acetins can be achieved through the transesterification of glycerol with methyl acetate (MA), a byproduct extensively generated in the manufacturing process of poly(vinyl alcohol) (PVA) . The worldwide annual production of PVA is over 1 Mt, leading to the generation of 1.68 Mt MA, suggesting a promising alternative solution for the downstream utilization of glycerol .…”

Section: Introductionmentioning

confidence: 99%

Co-upcycling of Plastic Waste and Biowaste via Tandem Transesterification Reactions

Li,

Zhang,

Liu

et al. 2024

JACS Au

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Polyethylene terephthalate (PET) and glycerol are prevalent forms of plastic and biowaste, necessitating facile and effective strategies for their upcycling treatment. Herein, we present an innovative one-pot reaction system for the concurrent depolymerization of PET plastics and the transesterification of glycerol into dimethyl terephthalate (DMT), a valuable feedstock in polymer manufacturing. This process occurs in the presence of methyl acetate (MA), a byproduct of the industrial production of acetic acid. The upcycling of biowaste glycerol into glycerol acetates renders them valuable additives for application in both the biofuel and chemical industries. This integrated reaction system enhances the conversion of glycerol to acetins compared with the singular transesterification of glycerol. In this approach, cost-effective catalysts, based on perovskite-structured CaMnO 3 , were employed. The catalyst undergoes in situ reconstruction in the tandem PET/glycerol/MA system due to glycerolation between the metal oxides and glycerol/acetins. This process results in the formation of small metal oxide nanoparticles confined in amorphous metal glycerolates, thereby enhancing the PET depolymerization efficiency. The optimized coupled reaction system can achieve a product yield exceeding 70% for glycerol acetates and 68% for PET monomers. This research introduces a tandem pathway for the simultaneous upcycling of PET plastic waste and biowaste glycerol with minimal feedstock input and maximal reactant utilization efficiency, promising both economic advantages and positive environmental impacts.

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