Selective catalytic reduction of NOx with NH3 using ZSM5 with low content of copper

Selective catalytic reduction of NOx with NH3 using ZSM5 with low content of copper

Abstract 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.

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Bibliographic Details
Main Authors: Sandoval Rangel,L., Lucio-Ortiz,C.J., Rivera de la Rosa,J., Castaldi,M.J.
Format: Digital revista
Language:English
Published: Sociedad Mexicana de Ciencia y Tecnología de Superficies y Materiales A.C. 2016
Online Access:http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1665-35212016000100001
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Summary:Abstract 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.

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