In the present study, an influence of the iron aggregation in conventional and micro-mesoporous MFI on their catalytic activity in the NO reduction with ammonia (DeNO_x process) was studied. Modification of MFI zeolite properties was done by the desilication in the presence of NaOH and TPAOH (tertapropylammonium hydroxide). In the next step, the samples were modified with iron by ion-exchange with the use of a conventional solution of Fe cations (FeSO₄) and a solution of iron triple-metallic aggregates (oligocations) ([Fe₃(OAc)₆O(H₂O)₃]⁺). Both of the applied modification techniques (desilication and modification with Fe₃ oligocations) increased the catalytic activity of the MFI zeolite in the DeNO_x process. This increased catalytic activity was connected with changes in sample porosity, Si/Al ratio, topology, as well as aggregation and dispersion of iron species on the catalyst surface, which was investigated by N₂-sorption, XRD, ICP, NMR, HRTEM and UV-vis-DRS techniques.

在本研究中，研究了常规和微介孔MFI中铁聚集对其在氨还原NO（DeNO _x工艺）中催化活性的影响。通过在NaOH和TPAOH（氢氧化四丙基铵）的存在下进行脱硅作用，可以改变MFI沸石的性能。在下一步中，使用常规的Fe阳离子溶液（FeSO ₄）和三重铁金属聚集体（oligocations）（[Fe ₃（OAc）₆ O （H ₂ O）₃ ] ⁺）。两种应用的改性技术（脱硅和Fe ₃改性）寡阳离子）在DENO增加所述MFI型沸石的催化活性_X过程。这种增加的催化活性与样品孔隙率，Si / Al比，拓扑结构以及铁物种在催化剂表面的聚集和分散的变化有关，这通过N ₂吸附，XRD，ICP，NMR，HRTEM和UV-vis-DRS技术。