Preparation of activated sewage sludge char for low temperature De-NO x and its CO emission inhibition.

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  • Additional Information
    • Source:
      Publisher: Elsevier Science Ltd Country of Publication: England NLM ID: 0320657 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-1298 (Electronic) Linking ISSN: 00456535 NLM ISO Abbreviation: Chemosphere Subsets: MEDLINE
    • Publication Information:
      Publication: Oxford : Elsevier Science Ltd
      Original Publication: Oxford, New York, : Pergamon Press.
    • Subject Terms:
      Carbon Monoxide/*chemistry ; Charcoal/*chemistry ; Nitrogen Oxides/*analysis ; Sewage/*chemistry; Adsorption ; Ammonia ; Catalysis ; Coal ; Denitrification ; Porosity ; Temperature
    • Abstract:
      Sewage sludge (SS) char can be potentially applied to De-NO x processes but it should be active enough and the relevant CO emissions should be controlled. In this paper activated SS chars have been prepared by using a simple KOH impregnation-carbonisation method and the activated chars are applied to remove NO x from flue gases within temperature range of 100-250 °C, acting as both reductants and catalysts. Special attention is paid to inhibiting CO emission in the process. Four reductive agents are adopted to check the catalytic effect of the activated SS chars. The results show that the activated SS chars (i.e. SC-KOHs) present a higher adsorption-reduction ability with much lower CO emission than that of non-activated SS chars (i.e. SC-Raws). SC-KOH produced at 800 °C (SC-KOH-800) shows obvious chemical adsorption behaviors, its adsorption capacity for NO is higher than 8.06 mg.L -1 , superior to the coal-based activated carbon. Hydrazine hydrate is found to enhance De-NO x performance with SC-KOHs acting as catalysts, especially at higher temperatures. However, the De-NO x efficiency decreased when ammonia, urea and urea involved reductants were used. The physicochemical structure of the SS chars was characterized to show that the SC-KOHs are more porous with higher BET areas and pore volumes. Simultaneously, the SC-KOHs are crystallized to much lower extent, less graphitised, but have richer O-containing functional groups and zeolite structure on the surface when compared to the SC-Raws, which contributed to their high activities. Moreover, SC-KOH-800 can be recommended as the suitable adsorbent/catalyst for De-NO x within 100-250 °C.
      (Copyright © 2020 Elsevier Ltd. All rights reserved.)
    • Contributed Indexing:
      Keywords: Activated char; CO emission inhibition; Catalyst; De-NO(x); Pyrolysis; Sewage sludge
    • Accession Number:
      0 (Coal)
      0 (Nitrogen Oxides)
      0 (Sewage)
      16291-96-6 (Charcoal)
      7664-41-7 (Ammonia)
      7U1EE4V452 (Carbon Monoxide)
    • Publication Date:
      Date Created: 20200313 Date Completed: 20200603 Latest Revision: 20200603
    • Publication Date:
      20240628
    • Accession Number:
      10.1016/j.chemosphere.2020.126330
    • Accession Number:
      32163778