Size controlled ZSM-5 on the structure and performance of Fe catalyst in the selective catalytic reduction of NOx with NH3

Fe/ZSM-5 catalysts with various morphologies and sizes were prepared and the catalytic properties in NH3-SCR were also investigated. The different ZSM-5 morphologies and sizes indeed influence the dispersion of Fe species. The Fe/ZSM-5 catalyst, which was cauliflower-like morphology of ZSM-5 support aggregated by small nano crystal zeolite with crystallite size of about 50 nm, exhibited the best NH3-SCR activity (T->= 90% = 280-650 degrees C). This specific morphology and size of ZSM-5 support were considered to benefit the distribution of isolated Fe3+ species, which was proved to be the main active sites in SCR reaction. (C) 2016 Published by Elsevier B.V.