Modified seeding method of hierarchical Fe-ZSM-5 SCR catalysts

A series of FeZSM-5 nano catalysts with hierarchical porosity were prepared by the modified seed-induced method, using silicate-1 and different amounts of functionalized iron oxide in the final composition as seeds. The effect of the Fe/TMAOH ratio in iron seed and Fe/Al ratio in initial synthetic gel on the properties of Fe-ZSM-5 catalyst were analyzed by XRD, SEM, NR2R-adsoption, FTIR, TPR and NHR3R-TPD. By adding iron to ZSM-5 initial gel, external surface area, total pore volume, particle size,amount of aluminum in the zeolite framework and micro-porosity percent decreased but the crystallinity was almost constant and FeR2ROR3 Rwas not appeared in XRD diffraction patterns. ZSM-5 with hexagonal structure without agglomeration were formed by increasing amount of iron in the initial gel. The catalytic performance of these samples was between 95 to 98% in nitrogen oxide catalytic reduction with ammonia