Resumo

SANDOVAL RANGEL, L.; LUCIO-ORTIZ, C.J.; RIVERA DE LA ROSA, J.  e  CASTALDI, M.J.. Selective catalytic reduction of NO_x with NH₃ using ZSM5 with low content of copper. Superf. vacío [online]. 2016, vol.29, n.1, pp.1-8.  Epub 23-Out-2020. ISSN 1665-3521.

A comprehensive experimental and characterization study of selective catalytic reduction of NOx with NH3 was carried out on Cu-ZSM5 catalysts, previously prepared by the aqueous ion exchange method with a copper loading of 0.2, 1 and 2 %. Results showed that even with Cu contents as low as 2 % over zeolite, NOx conversions higher than 92 % are obtained at 600 °C. The copper catalysts were characterized using FT-IR, XRD, UV-Visible and with studies such as SEM, STEM and HRTEM, where the presence of CuO cores were shown to enhance the de-NOx activity, due to their higher thermal stability compared with the other copper species found. The predominance of dispersed 4-5 nm particles over the zeolite was identified, which accounts for the high NOx conversion results shown in SCR process.

Palavras-chave : Selective catalytic reduction; ZSM-5; NO_x; Ammonia.