Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 13, Issue 13, Pages 3804-3817Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3cy00269a
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Two series of zeolite Y with different particle sizes (approximately 100 or 400 nm) were prepared using different synthesis gel compositions, ageing, and hydrothermal steps. Copper-containing zeolite Y samples were obtained through ion-exchange and characterized. The catalytic activity of these materials varied significantly due to the different copper species present.
Two series of zeolite Y were prepared with varying particle sizes (estimated to be 100 or 400 nm) by applying different synthesis gel composition ratios as well as different ageing and hydrothermal steps. Copper-containing zeolite Y samples were obtained through ion-exchange, thoroughly characterized and tested for the selective catalytic reduction with NH3 (NH3-SCR-DeNO(x)). The catalytic activity of the prepared materials varied significantly due to the different nature of copper species. Results show that catalysts CuY-0h-A and CuY-24h-A (approx. particle sizes 2676 and 475 nm, respectively) facilitate a higher NO conversion both in the presence and absence of water vapor, exhibiting however stronger N2O formation above 250 degrees C. On the other hand, nearly X-ray amorphous Y-0h-B and Y-24h-B after ion-exchange led to decreased activity of CuY-0h-B and CuY-24h-B (approx. particles sizes 345 and 128 nm, respectively). Additional insight into the activity of the catalysts was obtained through in situ DR UV-vis spectroscopy.
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