Journal
CATALYSTS
Volume 10, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/catal10050506
Keywords
chabazite; SSZ-13; preparation method; copper species; IR spectroscopy; NH3-SCR
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Funding
- Croatian Science Foundation [UIP-2019-04-4977]
- Deutscher Akademischer Austauschdienst-German Academic Exchange Service (DAAD) [57381327]
- National Science Centre, Poland [2015/18/E/ST4/00191]
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Nanosized SSZ-13 was synthesized hydrothermally by applying N,N,N-trimethyl-1-adamantammonium hydroxide (TMAdaOH) as a structure-directing agent. In the next step, the quantity of TMAdaOH in the initial synthesis mixture of SSZ-13 was reduced by half. Furthermore, we varied the sodium hydroxide concentration. After ion-exchange with copper ions (Cu2+ and Cu+), the Cu-SSZ-13 catalysts were characterized to explore their framework composition (XRD, solid-state NMR, ICP-OES), texture (N-2-sorption, SEM) and acid/redox properties (FT-IR, TPR-H-2, DR UV-Vis, EPR). Finally, the materials were tested in the selective catalytic reduction of NOx with ammonia (NH3-SCR). The main difference between the Cu-SSZ-13 catalysts was the number of Cu2+ in the double six-membered ring (6MRs). Such copper species contribute to a high NH3-SCR activity. Nevertheless, all materials show comparable activity in NH3-SCR up to 350 degrees C. Above 350 degrees C, NO conversion decreased for Cu-SSZ-13(2-4) due to side reaction of NH3 oxidation.
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