Isomorphic substitution of boron in ZSM-5 type zeolites using TBP as template

Anti-cancer activity of hierarchical ZSM-5 zeolites synthesized from rice-based waste materials

“…The IR spectra of the synthesized samples clearly showed the characteristic absorption bands at 3644, 3459, 1614, 1224, 1087, 787, 547, and 465 cm À1 , which were assigned to different vibrations of tetrahedral and framework atoms in the ZSM-5 zeolite. 33,34 The characteristic band at 3644 cm À1 is due to the hydrogen-bonded Si-OH groups, and a broad peak around 3438 cm À1 is attributed to Al-OH in the zeolite framework. The band at 1614 cm À1 is ascribed to the OH bending vibration mode of the residual H 2 O molecules in the zeolite voids.…”

Photo-degradation of acid green dye over Co–ZSM-5 catalysts prepared by incipient wetness impregnation technique

“…The main peaks at 453, 556, 798 and the broad peak in the range of 1150-1250 cm −1 have the general assignment given by Flanigen et al [16] for the vibrational modes of zeolite framework to the bending of the TO 4 (T = Al or Si) tetrahedra, to the structurally sensitive double five membered ring (D5R) vibration. Bonding of divalent cations to the framework oxygen atoms causes local deformation of the zeolite framework, which may be detected in T O T vibration changes [17,18]. The addition of 2 wt.% of cobalt caused local deformation of the vibrational band at 556 cm −1 while it splitted (before it fades beyond 5Co-Z) into 541 and 584 cm −1 .…”

Hydrothermal Synthesis and Characterization of Nano Sized ZSM-5 and Their Effect on the Decolorization of Indigo Carmine Dye

“…The result shows bands at 1235, 1148, 800, 554 and 466 cm -1 , which are assigned to different vibrations of tetrahedral and framework atoms in ZSM-5 [38]. The bands at about 1148 and 466 cm -1 are due to internal asymmetric stretching vibration of Si-O-T linkage, whereas the bands at about 1235, 800, and 554 cm -1 are due to symmetric stretching of the external linkage and hence sensitive to framework structure [38,39] .On the other hand the band at 466cm -1 related of T-O (where T= Si or Al) bending vibration of the (Si,Al)O 4 internal tetrahedral unites which designated as TO 4 in the framework of ZSM-5 [40]. However, the relative increased of the band at 554 in SA sample indicating the complete crystalline structure ZSM-5 crystalline structure.…”