Structural rearrangements in Fe-porous clay heterostructures composites derived from Laponite (R) - Influence of preparation methods and Fe source
PBN-AR
Instytucja
Instytut Katalizy i Fizykochemii Powierzchni im. Jerzego Habera Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
MICROPOROUS AND MESOPOROUS MATERIALS
ISSN
1387-1811
EISSN
Wydawca
ELSEVIER SCIENCE BV
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
66-81
Numer tomu
231
Liczba arkuszy
Autorzy
Pozostali autorzy
+ 4
Streszczenia
Język
en
Treść
In this study novel approach of Fe doped porous clay heterostructures synthesis by iron incorporation from the inorganic Fe(NO3)3·9H2O and metal-organic C6H5FeO sources, via post-synthesis route and pressure assistance, was described. Although post-synthesis impregnation proved to be sufficient method of porous clay heterostructures functionalization with iron species, the use of autoclaving ensured better dispersion of Fe nanostructures on the surface of clay derived supports. Appropriate choice of iron source was also essential to control formation of surface and sub-surface Fe species and incorporation of Fe into the selected lattice sites of the composite. The presence of ultrafine crystallites of α-Fe2O3 and Fe3O4 phases by TEM analysis supporting XRD measurement was evidenced. It turn out that high pressure treatment facilitated migration of trivalent heterocations along the composite network. It caused even complete iron embedding into the bulk/sub-surface lattice. The temperature transformation and pressure treatment not only influenced the composition and dispersion of the surface Fe species. It caused structure evolution of PCH composite, modification its textural properties, the increase of the average pore diameter (from 2.6 nm in PCH to 3.7 nm in FePCH-nit/aut and 4.5 nm in FePCH-cit/aut). Those phenomena influenced the catalytic activity of studied samples in ethanol decomposition. Transmission and reflection FTIR techniques in MIR and NIR regions, 57Fe Mössbauer and 29Si MAS-NMR spectroscopies were used to describe the structural rearrangements of PCH composites derived from Laponite® upon modified post-synthesis introduction of Fe and to distinguish between different species of Fe highly dispersed on the extended PCH surface. Discover the world's research 10+ million members 100+ million publications 100k+ research projects Join for free
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
740766
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