Halimaton Hamdan

TL;DR: XRD, (29)Si MAS NMR and solid yield studies indicate that the transformation mechanism of silica present in RHA to zeolite Beta involves dissolution of the ash, formation of an amorphous aluminosilicate after 6h of crystallization, followed by dissolution in the mother liquor and final transformation to pure zeolites Beta crystals.

TL;DR: In this article, solid-state NMR was used to determine the geometry of the Bronsted acid site in zeolites, and the mean distance between acidic protons in bridging hydroxyl groups and the nearest framework Al atom was 2.38±0.04 A in H-ZSM-5.1 H, 27 Al and 29 Si solid state NMR.

TL;DR: The local structure of amorphous silica was investigated by 29Si magic-angle spinning nuclear magnetic resonance (MAS NMR) and field emission scanning electron microscopy (FESEM) in order to optimize the process as mentioned in this paper.

TL;DR: Inspired by the high accessibility and low diffusion limitations of fibrous silica nanoparticles (KCC-1), this paper designed a microemulsion system using a spherical FZSM-5 with a dendrimeric silica fiber possessed a high surface area (554 m2), a wide pore diameter (2−20 nm), abundant strong acid sites and high catalytic activity towards cumene hydrocracking.

TL;DR: In this article, mesures par diffraction des rayons X et spectrometrie RMN indiquent que les atomes d'aluminium peuvent etre elimines de la zeolite Y par traitement hydrothermique and reinseres by traitement avec une solution aqueuse d'hydroxyde de potassium.