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Co-doping a metal (Cr, Mn, Fe, Co, Ni, Cu, and Zn) on Mn/ZSM-5 catalyst and its effect on the catalytic reduction of nitrogen oxides with ammonia

Saeidi, M ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1007/s11164-016-2751-0
  3. Publisher: Springer Netherlands , 2017
  4. Abstract:
  5. Selective catalytic reduction (SCR) of NOx by NH3 over a series of Mn–M/Z catalysts (M = Cr, Mn, Fe, Co, Ni, Cu, Zn, and Z = the ZSM-5 Zeolite) synthesized by wet impregnation method was investigated. Mn–Fe/Z, Mn–Co/Z, and Mn–Cu/Z catalysts exhibited approximately 100 % NOx conversion over a wide temperature range (200–360 °C) in a defined atmospheric condition, which was noticeably greater than that of Mn–Cr/Z (340–360 °C). Furthermore, the effect of addition of second metal oxide species to the initial Mn/Z catalyst on the structure of catalysts was studied by several characterization techniques. BET measurements revealed high surface area and pore volume of the Mn–Cu/Z catalyst. In addition, the XRD and UV–Vis DR results showed that addition of co-doped metal oxide species improved the dispersion of metal ions and inhibited crystallization of metal oxides. UV–Vis studies also were in good accordance with DTA/TG results confirming the formation of cobalt oxide and copper oxide clusters in Mn–Co/Z and Mn–Cu/Z catalysts, respectively. The FTIR spectra of pyridine adsorption, in addition, suggested the Mn–Cu/Z catalyst contained the most Lewis acid sites leading to more NOx adsorption capacity. © 2016, Springer Science+Business Media Dordrecht
  6. Keywords:
  7. Bimetallic catalyst ; FTIR ; Manganese ; NH3–SCR ; Wet impregnation ; Catalysts ; Cobalt ; Cobalt compounds ; Copper ; Fourier transform infrared spectroscopy ; Impregnation ; Manganese compounds ; Metal ions ; Metallic compounds ; Metals ; Nickel ; Nitric oxide ; Nitrogen oxides ; Reduction ; Selective catalytic reduction ; Zinc ; Adsorption capacities ; Atmospheric conditions ; Bimetallic catalysts ; Characterization techniques ; Wet impregnation method ; Wide temperature ranges
  8. Source: Research on Chemical Intermediates ; Volume 43, Issue 4 , 2017 , Pages 2143-2157 ; 09226168 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11164-016-2751-0