Synthesis and functionalization of SSZ-13 as an NH 3 -SCR catalyst

• Published in: Catalysis science & technology 2014, Vol.4 (11), p.3917-3926
• Main Authors: Shishkin, Alexander, Kannisto, Hannes, Carlsson, Per-Anders, Härelind, Hanna, Skoglundh, Magnus
• Format: Article
• Language: English
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/C4CY00384E

Hydrothermal synthesis of Na-SSZ-13 using a low concentration of the structure-directing agent N , N , N -trimethyl-1-adamantanimonium hydroxide and functionalization of the SSZ-13 framework through the introduction of Cu and Fe via ion exchange have been carried out. The prepared samples were characterized by XRD, SEM, and UV-vis spectroscopy, N 2 sorption, XRF and NH 3 -TPD. It was found that relatively large iron oxide particles and well-dispersed Cu 2+ species are formed as a result of ion exchange with iron and copper, respectively. Furthermore, the catalytic activity for NH 3 oxidation, NO oxidation and selective catalytic reduction of NO x with ammonia (NH 3 -SCR) was investigated both in the absence and in the presence of water. The functionalization of the SSZ-13 structure enhances the catalytic activity for NH 3 -SCR significantly. While the NH 3 -SCR activity is negligible for the Na-SSZ-13 sample, the Cu-SSZ-13 sample is highly active especially at low temperatures, and the Fe-SSZ-13 sample shows the highest activity at elevated temperatures.