Jump to main content
Jump to site search


Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts

Author affiliations

Abstract

The catalytic properties of iron-exchanged LTA and SSZ-13 zeolites with different Si/Al (11–23) and Fe/Al (0.18–0.37) ratios hydrothermally aged at 750–900 °C have been investigated in the selective catalytic reduction of NOx by NH3 (NH3-SCR). When the zeolite support possesses the same bulk ratio (16), each fresh Fe-LTA catalyst always exhibits a higher NO conversion than the corresponding Fe-SSZ-13 catalyst with a similar Fe/Al ratio in the reaction temperature range studied. Hydrothermal aging at 900 °C led to a noticeable decrease in NH3-SCR performance of both series of catalysts. However, the extent of the decrease was found to be considerably smaller in the Fe-LTA series. This allows each of the Fe-LTA series to outperform even Fe-beta, which is known as the most hydrothermally stable among the iron-exchanged zeolite catalysts tested so far. The overall characterization results of this study reveal that the active iron species (e.g., isolated Fe3+ ions and small oligomeric FexOy species) in Fe-LTA are more stable than those in Fe-SSZ-13, mainly due to notable differences in their iron ion sites.

Graphical abstract: Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts

Back to tab navigation

Supplementary files

Publication details

The article was received on 05 Jan 2019, accepted on 01 Feb 2019 and first published on 01 Feb 2019


Article type: Paper
DOI: 10.1039/C9RE00007K
Citation: React. Chem. Eng., 2019, Advance Article

  •   Request permissions

    Iron-exchanged high-silica LTA zeolites as hydrothermally stable NH3-SCR catalysts

    T. Ryu, Y. Kang, I. Nam and S. B. Hong, React. Chem. Eng., 2019, Advance Article , DOI: 10.1039/C9RE00007K

Search articles by author

Spotlight

Advertisements