TY - JOUR
T1 - Isomorphous substitution of Fe3+ in the framework of aluminosilicate mordenite by hydrothermal synthesis
AU - Wu, Peng
AU - Komatsu, Takayuki
AU - Yashima, Tatsuaki
PY - 1998/2
Y1 - 1998/2
N2 - Fe3+ framework-substituted mordenites have been hydrothermally synthesized under template-free conditions using the gel compositions with SiO2/(Al2O3 + Fe2O3) molar ratio of 20, 15 and 10 where Fe2O3/Al2O3 molar ratio was varied from 0 to 1000. Crystalline materials with Fe incorporated into the framework have been obtained from starting gels containing up to 0.5, 0.63 and 0.75 mol fraction of Al2O3 replaced by Fe2O3 at SiO2/(Al2O3 + Fe2O3) ratio of 20, 15 and 10, respectively. Using gels with lower SiO2/(Al2O3 + Fe2O3) ratio has extended the maximum substitution level of Fe for Al. XRD, UV visible. IR spectroscopy and chemical analysis have provided evidence for the presence of framework Fe. When Al atoms were gradually replaced by Fe, unit cell parameters increased and an asymmetric stretching vibration of Si-O-T was shifted to lower wavenumbers. A new band around 3630 cm-1 due to Si(OH)Fe groups observed in the IR spectra of Fe-containing mordenite also supports the framework incorporation of Fe.
AB - Fe3+ framework-substituted mordenites have been hydrothermally synthesized under template-free conditions using the gel compositions with SiO2/(Al2O3 + Fe2O3) molar ratio of 20, 15 and 10 where Fe2O3/Al2O3 molar ratio was varied from 0 to 1000. Crystalline materials with Fe incorporated into the framework have been obtained from starting gels containing up to 0.5, 0.63 and 0.75 mol fraction of Al2O3 replaced by Fe2O3 at SiO2/(Al2O3 + Fe2O3) ratio of 20, 15 and 10, respectively. Using gels with lower SiO2/(Al2O3 + Fe2O3) ratio has extended the maximum substitution level of Fe for Al. XRD, UV visible. IR spectroscopy and chemical analysis have provided evidence for the presence of framework Fe. When Al atoms were gradually replaced by Fe, unit cell parameters increased and an asymmetric stretching vibration of Si-O-T was shifted to lower wavenumbers. A new band around 3630 cm-1 due to Si(OH)Fe groups observed in the IR spectra of Fe-containing mordenite also supports the framework incorporation of Fe.
KW - Ferrisilicate
KW - Iron
KW - Iron-containing mordenite
KW - Isomorphous substitution
KW - Mordenite
UR - https://www.scopus.com/pages/publications/0031995372
U2 - 10.1016/S1387-1811(97)00005-X
DO - 10.1016/S1387-1811(97)00005-X
M3 - 文章
AN - SCOPUS:0031995372
SN - 1387-1811
VL - 20
SP - 139
EP - 147
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-3
ER -