Catalytic oxidation of NO at ambient temperature over the chars from pyrolysis of sewage sludge

Wenyi Deng, Cong Tao, Kirk Cobb, Hongfeng Zhou, Yaxin Su, Roger Ruan

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3 Scopus citations

Abstract

Sludge char (SC) was prepared by pyrolysis of sewage sludge, then nitric acid washing, potassium hydroxide activation, and hydrogen reduction methods were used to seek for the optimum treatment for improving the catalytic oxidation of NO at 30 °C. The optimum NO conversion of 65.6% was achieved when SC was activated and hydrogen-reduced, indicating the promising prospect of NO oxidation catalyst preparation from sewage sludge. The prepared SCs showed an intensive specific pore volume peak at the micropore size of 0.89 nm which is beneficial for NO oxidation. SC characterization like temperature programmed desorption of CO2/NO/NO2, in-situ diffuse reflectance infrared Fourier transform spectroscopy, etc. were conducted to reveal the catalytic oxidation mechanisms of NO. The results indicated that the oxygen-containing functional groups, such as carboxylic acid, carboxylic anhydrites and lactones, were largely removed by hydrogen reduction, leading to marked increases of surface basicity, specific surface area, and catalytic activity of SCs. The NO oxidation over the SCs can be explained quite well by the Eley-Rideal reaction model.

Original languageEnglish (US)
Article number126429
JournalChemosphere
Volume251
DOIs
StatePublished - Jul 2020

Bibliographical note

Funding Information:
This work was supported by the Shanghai Natural Science Foundation ( 19ZR1400700 ), the Fundamental Research Funds for the Central Universities ( 2232019D3-24 ), and Scientific Research Project from Science and Technology Commission of Shanghai Municipality ( 19DZ1204903 ).

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Catalytic oxidation
  • Char
  • NO
  • Pyrolysis
  • Sewage sludge

PubMed: MeSH publication types

  • Journal Article

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