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A clean and membrane-free chlor-alkali process with decoupled Cl2 and H2/NaOH production

Author

Listed:
  • Mengyan Hou

    (Fudan University)

  • Long Chen

    (Fudan University)

  • Zhaowei Guo

    (Fudan University)

  • Xiaoli Dong

    (Fudan University)

  • Yonggang Wang

    (Fudan University)

  • Yongyao Xia

    (Fudan University)

Abstract

Existing chlor-alkali processes generally use asbestos, mercury or fluorine-containing ion-exchange membranes to separate the simultaneous chlorine production on the anode and hydrogen production on the cathode, and form sodium hydroxide in the electrolyte. Here, using the Na+ de-intercalation/intercalation of a Na0.44MnO2 electrode as a redox mediator, we decouple the chlor-alkali process into two independent steps: a H2 production step with the NaOH formation in the electrolyte and a Cl2 production step. The first step involves a cathodic H2 evolution reaction (H2O → H2) and an anodic Na+ de-intercalation reaction (Na0.44MnO2 → Na0.44−xMnO2), during which NaOH is produced in the electrolyte solution. The second step depends on a cathodic Na+ intercalation reaction (Na0.44−xMnO2 → Na0.44MnO2) and an anodic Cl2 production (Cl → Cl2). The cycle of the two steps provides a membrane-free process, which is potentially a promising direction for developing clean chlor-alkali technology.

Suggested Citation

  • Mengyan Hou & Long Chen & Zhaowei Guo & Xiaoli Dong & Yonggang Wang & Yongyao Xia, 2018. "A clean and membrane-free chlor-alkali process with decoupled Cl2 and H2/NaOH production," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-02877-x
    DOI: 10.1038/s41467-018-02877-x
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    Cited by:

    1. Jianan Gao & Qingquan Ma & Zhiwei Wang & Bruce E. Rittmann & Wen Zhang, 2024. "Direct electrosynthesis and separation of ammonia and chlorine from waste streams via a stacked membrane-free electrolyzer," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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