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Jabło´nska, Magdalena [Author]; Góra-Marek, Kinga [Author]; Grilc, Miha [Author]; Bruzzese, Paolo Cleto [Author]; Poppitz, David [Author]; Pyra, Kamila [Author]; Liebau, Michael [Author]; Pöppl, Andreas [Author]; Likozar, Blaž [Author]; Gläser, Roger [Author]

Effect of Textural Properties and Presence of Co-Cation on NH3-SCR Activity of Cu-Exchanged ZSM-5

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  • Media type: E-Article
  • Title: Effect of Textural Properties and Presence of Co-Cation on NH3-SCR Activity of Cu-Exchanged ZSM-5
  • Contributor: Jabło´nska, Magdalena [Author]; Góra-Marek, Kinga [Author]; Grilc, Miha [Author]; Bruzzese, Paolo Cleto [Author]; Poppitz, David [Author]; Pyra, Kamila [Author]; Liebau, Michael [Author]; Pöppl, Andreas [Author]; Likozar, Blaž [Author]; Gläser, Roger [Author]
  • imprint: Basel : MDPI, [2023]
  • Language: English
  • Keywords: Chemie und Pharmazie ; science-chemistry ; zeolite ZSM-5; micro-/mesoporous zeolites; copper; co-cation; NH3-SCR
  • Origination:
  • Footnote: Hinweis: Link zur Erstveröffentlichung URL: https://doi.org/10.3390/catal11070843
  • Description: Comparative studies over micro-/mesoporous Cu-containing zeolites ZSM-5 prepared by top-down treatment involving NaOH, TPAOH or mixture of NaOH/TPAOH (tetrapropylammonium hydroxide) were conducted. The results of the catalytic data revealed the highest activity of the Cu-ZSM-5 catalyst both in the absence and presence of water vapor. The physico-chemical characterization (diffuse reflectance UV-Vis (DR UV-Vis), Fourier transform infrared (FT-IR) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, temperature-programmed desorption of NOx (TPD-NOx), and microkinetic modeling) results indicated that the microporous structure of ZSM-5 effectively stabilized isolated Cu ion monomers. Besides the attempts targeted to the modification of the textural properties of the parent ZSM-5, in the next approach, we studied the effect of the co-presence of sodium and copper cations in the microporous H-ZSM-5. The presence of co-cation promoted the evolution of [Cu–O–Cu]2+ dimers that bind NOx strongly with the desorption energy barrier of least 80 kJ mol−1. Water presence in the gas phase significantly decreases the rate of ammonia oxidation, while the reaction rates and activation energies of NH3-SCR remain unaffected.
  • Access State: Open Access
  • Rights information: Attribution (CC BY)