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On the use of plastic precursors for preparation of activated carbons and their evaluation in CO2 capture for biogas upgrading: a review

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WASTE MANAGEMENT
卷 161, 期 -, 页码 116-141

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2023.02.022

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Activated carbons; Biogas upgrading; Char; CO2 capture; Plastic waste; Pyrolysis

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In circular economy, plastic materials are recycled through pyrolysis, which generates gas, liquid, and solid products. However, commercial applications for the solid product have not been found yet. This article reviews the preparation and properties of plastic-based activated carbons, and discusses their application for CO2 capture in biogas upgrading processes.
In circular economy, useful plastic materials are kept in circulation as opposed to being landfilled, incinerated, or leaked into the natural environment. Pyrolysis is a chemical recycling technique useful for unrecyclable plastic wastes that produce gas, liquid (oil), and solid (char) products. Although the pyrolysis technique has been extensively studied and there are several installations applying it on the industrial scale, no commercial appli-cations for the solid product have been found yet. In this scenario, the use of plastic-based char for the biogas upgrading may be a sustainable way to transform the solid product of pyrolysis into a particularly beneficial material. This paper reviews the preparation and main parameters of the processes affecting the final textural properties of the plastic-based activated carbons. Moreover, the application of those materials for the CO2 capture in the processes of biogas upgrading is largely discussed.

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