Structural, compositional and acidic characteristics of nanosized amorphous or partially crystalline ZSM-5 zeolite-based materials

Gas–oil cracking activity of hydrothermally stable aluminosilicate mesostructures (MSU-S) assembled from zeolite seeds: Effect of the type of framework structure and porosity

“…This type of sorption properties has been previously reported for nanosized (fundamental particle sizes smaller than ca. 20 nm) crystalline or amorphous Beta and MFI zeolite-based materials, and is attributed to interparticle mesoporosity [8][9][10][11]. The TEM images (not shown) of MSU-S/ S (BEA) verified the formation of fundamental nanoparticles of 10-15 nm in size closely interconnected and capable of generating interparticle mesoporosity with pore diameters in the range 3-30 nm, in accordance with nitrogen sorption data.…”

Conversion of South African Coal Fly Ash into High-Purity ZSM-5 Zeolite without Additional Source of Silica or Alumina and Its Application as a Methanol-to-Olefins Catalyst

“…In aluminum nuclear magnetic resonance ( 27 Al-NMR) spectra (Figure 3), the signal that corresponds to the extra framework-coordinated aluminum in FFAE1 and AL spectra (at about 0 ppm) is converted into a signal that corresponds to the framework-coordinated aluminum in H-ALTPABr, H-AL-HDA, H-AL-PA, H-FFAE1-TPABr, H-FFAE1-HDA and H-FFAE1-PA (at about 55 ppm), as confirmed by Triantafyllidis and coworkers [48], and Sazama and coworkers [40]. The broad signal located at 0 ppm in FFAE1 may be due to the distortions of the octahedral symmetry of the AlO6 units as it was stated by Byrappa and Yoshimura [49] and Sazama and coworkers [40].…”

Effects of the different synthetic parameters on the crystallinity and crystal size of nanosized ZSM-5 zeolite

“…A further investigation on the crystallization temperature was done on partially, crystalline and amorphous ZSM-5 zeolite (Triantafyllidis et al 2004). Samples were synthesized with different temperatures from 25°C to 150°C.…”