Alkaline treatment of iron-containing MFI zeolites.: Influence on mesoporosity development and iron speciation

被引：17
|
作者：
Groen, Johan C.
Maldonado, Lluis
Berrier, Elise
Brueckner, Angelika
Moulijn, Jacob A.
Perez-Ramirez, Javier
机构：
[1] Delft Univ Technol, DelftChemTech, NL-2628 BL Delft, Netherlands
[2] Inst Chem Res Catalonia ICIQ, Lab Heterogeneous Catalysis, E-43007 Tarragona, Spain
[3] Inst Appl Chem Berlin Adlershof, D-12474 Berlin, Germany
[4] ICREA, E-08010 Barcelona, Spain
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2006年 / 110卷 / 41期
关键词：
D O I：
10.1021/jp0643193
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effects of alkaline treatment on the mesoporosity development and iron speciation in Fe-MFI zeolites have been investigated. To this end, a variety of samples derived from different synthetic routes and having distinct Si/Al ratios and Fe content were treated in NaOH solutions and characterized by N-2 adsorption, SEM, TEM, UV/vis spectroscopy, and EPR. The alkaline treatment induces a significant intracrystalline mesoporosity development by framework silicon extraction and promotes disintegration of oligomeric iron species. Iron in framework positions has shown to provoke mesopore formation, whereas nonframework iron species suppresses silicon leaching and lowers the extent of extra porosity.
引用
收藏
页码：20369 / 20378
页数：10
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