engleski

Effect of the Preparation Method on the Catalytic Properties of Copper-containing Zeolite Y Applied for NH3-SCR- DeNOx

Two series of zeolite Y were prepared with varying particle size (estimated 100 or 400 nm) by applying different synthesis gel composition ratios as well as different ageing and hydrothermal steps. Copper-containing zeolites Y were obtained through ion exchange, thoroughly characterized and tested for the selective catalytic reduction with NH3 (NH3-SCR-DeNOx). 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. particles size 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 °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 size 345 and 128 nm, respectively). Additional insight into the activity of both catalyst were obtained through in situ DR UV-Vis spectroscopy.

FAU-type ; zeolite Y ; preparation method ; copper ; NH3-SCR-DeNOx ; in situ DR UV-Vis

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