An investigation into catalysts to improve the low temperature performance of an SCR

Youhong Xiao, Peilin Zhou, Wenping Zhang

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Selective catalytic reduction with NH3 is considered as one of the most effective technologies controlling NOx emission. Metal Fe based catalysts were used in the investigation to improve the low temperature performance of NOx conversion. The temperature range studied was between 150 degrees C and 350 degrees C with the interval of 50 degrees C. The honeycomb catalysts were prepared by an impregnation method. The study also included characterization of catalysts by BET, XRD, H2-TPR, SEM and XPS methods. It is found an increase in metal Fe content from 2 to 6 % wt. offers an improvement in the catalytic performance. However, a further increment in Fe content will result in a decrease in its performance. More than 90 % NOx conversion rate could be achieved over the Fe-based honeycomb catalyst at a low temperature by doping with Ni and Zr metal with different weights. Among all the catalysts studied, the mixed metal catalyst of Fe-Ni-Zr is found the most potential one, not only because of its higher NOx conversion rate at a low temperature, but also because of its wider operation temperature window. The effect of gas hourly space velocity (GHSV) was also investigated in the study and results show as GHSV increases that reduction of NOx is decreased.
Original languageEnglish
Pages (from-to)19-26
Number of pages8
JournalProceedings- Institute of Marine Engineering Science and Technology Part A Journal of Marine Engineering and Technology
VolumePart A
Issue numberNo. A14
Publication statusPublished - Apr 2009


  • NH3-SCR
  • ceramic honeycomb
  • Fe-based catalysts
  • low temperature
  • naval engineering

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