4.7 Article

Promotional removal of oxygenated VOC over manganese-based multi oxides from spent lithium-ions manganate batteries: Modification with Fe, Bi and Ce dopants

期刊

SCIENCE OF THE TOTAL ENVIRONMENT
卷 740, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.scitotenv.2020.139951

关键词

Spent lithium-ions batteries; Multi metal oxides; Fe, Bi, Ce dopants; Oxygenated VOC; In-situ DRIFTS; TD/GC-MS

资金

  1. National Natural Science Foundation of China [21876107, 21607103]

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In this work, cathode materials of spent lithium-ions manganate batteries are recovered as the precursor of manganese-based oxides catalysts and furthermore, different amount of Fe, Bi, Ce are introduced to modify their properties. A series of MnOx(MS)-X Fe, MnOx(MS)-X Bi and MnOx(MS)-X Ce samples with crystal phase of Mn5O8 are synthesized using combustion method and then the catalytic behavior and physicochemical properties of prepared catalysts are investigated. Compared to binary MnOx-5% Fe, MnOx-15% Bi and MnOx-10% Ce samples, multi MnOx(MS)-5% Fe, MnOx(MS)-15 Bi and MnOx(MS)-10% Ce catalysts display enhanced catalytic performance significantly in the removal of oxygenated VOC, which could be attributed to larger specific surface area, higher concentration of surface active oxygen species and Mn4+ ions and better reducibility at low temperature. In-situ DRIFTS results imply that main oxygen-containing functional groups such as carbonyl (-C=O), carboxyl (-COO), hydroxyl (-OH) can be observed during VOC oxidation and by comparison, it can be found that gas-phase O-2 plays a crucial role in facilitating the further oxidation of by-products into CO2. In addition, TD/GC-MS results point out that the main by-products are formaldehyde; 2-propanol, 1-methoxy-; ethanol, 2-methoxy-, acetate; 2-ethoxyethyl acetate; acetic add during VOC oxidation. (C) 2020 Elsevier B.V. All rights reserved.

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