当前位置: X-MOL 学术Micropor. Mesopor. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Influence of iron aggregation on the catalytic performance of desilicated MFI in the DeNOx process
Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2018-09-19 , DOI: 10.1016/j.micromeso.2018.09.015
M. Rutkowska , A. Borcuch , A. Marzec , A. Kowalczyk , B. Samojeden , J.M. Moreno , U. Díaz , L. Chmielarz

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 (DeNOx 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 DeNOx 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.



中文翻译:

铁聚集在脱硅的MFI在DENO催化性能的影响X过程

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。

更新日期:2018-09-19
down
wechat
bug