Issue 104, 2015

Ammonia selective catalytic reduction of NO over Ce–Fe/Cu–SSZ-13 catalysts

Abstract

A series of CHA-type trimetallic composite zeolites of Cex–Fey/Cu–SSZ-13 catalysts were prepared using Cu–SSZ-13, synthesized in a one-pot procedure, and subsequent ion-exchange with Fe3+ and Ce3+. The catalysts were characterized including TEM, XRD, XPS, SEM and BET. Their catalytic performances for selective catalytic reduction of NO with NH3 were investigated. The results of XRD revealed that the crystal structure of zeolite Ce–Fe/Cu–SSZ-13 is the same as Cu–SSZ-13. It is known from the results of BET and catalytic performance tests that larger specific surface areas and smaller pore size favor a catalytic reaction. Among the prepared Cex–Fey/Cu–SSZ-13 catalysts, Ce0.017–Fe0.017/Cu–SSZ-13 displayed the best SCR performance. The NO conversion was more than 90% between 200 and 500 °C. N2 selectivity was above 98% within the wider temperature range of 150–550 °C. In addition, the catalyst demonstrated sulfur–water tolerance and effective resistance against high space velocity. The phenomena suggest that synergistic effects of Cu, Fe and Ce species improve the SCR performances and make the Ce–Fe/Cu–SSZ-13 catalyst a promising candidate for NH3–SCR technology.

Graphical abstract: Ammonia selective catalytic reduction of NO over Ce–Fe/Cu–SSZ-13 catalysts

Article information

Article type
Paper
Submitted
10 Aug 2015
Accepted
24 Sep 2015
First published
24 Sep 2015

RSC Adv., 2015,5, 85453-85459

Author version available

Ammonia selective catalytic reduction of NO over Ce–Fe/Cu–SSZ-13 catalysts

X. Liu, Y. Li and R. Zhang, RSC Adv., 2015, 5, 85453 DOI: 10.1039/C5RA16072C

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