4.7 Article

Insights into high CO-SCR performance of CuCoAlO catalysts derived from LDH/MOFs composites and study of H2O/SO2 and alkali metal resistance

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 426, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131873

Keywords

Catalysis; CO-SCR; Poisoning; K resistances

Funding

  1. National Natural Science Foundation of China [21866022, 21567018]
  2. Inner Mongolia Natural Science Foundation [2021MS02014]
  3. Inner Mongolia Grassland talents project
  4. Inner Mongolia Key Laboratory of Environmental Pollution Control and Waste Resource Recycle
  5. Key Laboratory of Ecology and Resource Use of the Mongolian Plateau
  6. Collaborative Innovation Center for Grassland Ecological Security
  7. Ministry of Education of China
  8. Open Foundation of Key Laboratory of Industrial Ecology and Environmental Engineering, MOE (KLIEEE-2010)

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This study successfully developed Cu and Zn modified CoAlO catalysts with improved denitration performance and anti-poisoning ability, showing great potential for practical applications at low temperatures. The synergistic interaction between Co and Cu contributes to the outstanding deNOx performance. This work provides a new strategy for the design and fabrication of low temperature CO-SCR catalysts.
Selective catalytic reduction of NOx with CO technology (CO-SCR) is deemed to be a valid and economical solution for NOx abatement. Currently, developing CO-SCR catalysts with better performance for boosting NOx purification is imperative but still lacking. Moreover, H2O/SO2 and alkali metal poisoning of CO-SCR catalysts are still austere challenges. Herein, we have elaborately designed Cu and Zn modified CoAlO catalysts by heating decomposition of LDH/MOFs composite precursors. The physicochemical property, denitration performance, anti-K, anti-H2O and anti-SO2 poisoning ability of catalyst were systematically investigated. Catalytic tests showed that the CuCoAlO catalyst achieved 99.1% NO conversion at 200 degrees C, and maintained excellent long-term catalytic stability. The strong synergistic interaction between Co and Cu leads to stronger redox property and abundant surface active oxygen species, and brings the outstanding deNOx performance. Impressively, the CuCoAlO catalyst displayed splendid water and alkali resistance which exhibited great potential in practical application. The catalytic and SO2-deactivation mechanisms were investigated by in situ FTIR spectra and DFT analysis, demonstrating that the nitrates and weak carbonate species are the main intermediates. SO2 hindered the SCR reaction by competing with NO for adsorption sites. This work provides a new strategy for the design and fabrication of low temperature CO-SCR catalysts and will be favorable to academic and practical applications in the future.

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