Characterization of iron-mesoporous molecular sieves obtained by a microwave-hydrothermal process

被引：10

作者：

Bachari, K. ^{[1
]}

Touileb, A. ^{[1
]}

Lamouchi, M. ^{[2
]}

机构：

[1] Ctr Rech Sci & Tech Anal Physicochim CRAPC, Algiers 16004, Algeria

[2] Univ Littoral Cote dOpale, MREI, EA 2598, Lab Catalyse & Environm, F-59140 Dunkerque, France

来源：

TRANSITION METAL CHEMISTRY | 2009年 / 34卷 / 05期

关键词：

ZIRCONIA CATALYSTS; SBA-15; BENZYLATION; STABILITY; RELAXATION; FRAMEWORK; PROMOTER; CLUSTERS; ZEOLITE; TOLUENE;

D O I：

10.1007/s11243-009-9226-8

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Fe-SBA-15 materials with different Si/Fe ratios (Si/Fe = 90, 50, 10) have been synthesized by a microwave-hydrothermal (M-H) process and characterized by several spectroscopic techniques. Electrons spin resonance and Mossbauer spectroscopies, along with electron microscopy and X-ray diffraction, allowed differentiation of several iron species. These species correspond to hematite particles, very small "isolated" or oligomeric Fe-III species possibly incorporated in the mesoporous silica wall, and Fe-III oxide clusters either isolated or agglomerated, forming "rafts" at the surface of the silica and exhibiting ferromagnetic ordering. Due to their agglomeration, these clusters appear with a two-peak size distribution, with one peak corresponding to the isolated clusters formed in the mesopores and still embedded in them (ca. 2 nm diameter) and the other corresponding to the agglomerates spread on the surface of the mesoporous silica particles (ca. 9 nm).

引用

页码：529 / 537

页数：9

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