Rapid Transformation of Amorphous Nanoparticles into Crystalline Y Nanozeolites Using Poly(vinyl alcohol) Layers Covered onto the Amorphous Nanoparticles

Abstract

The Faujasite zeolite (Type-Y) is highly desired for many applications; nevertheless, these nanozeolites are challenging to synthesize via fast and low-cost pathways. This work provides a novel, simple, fast, and low-cost pathway to synthesize of Y nanocrystalline zeolite using poly­(vinyl alcohol) as a growth inhibitor. Poly­(vinyl alcohol) fasts the process transformation of amorphous particles into Y nanocrystalline zeolite through coating, protecting, and stabilizing of amorphous nanoparticles under high crystalline temperature. The structures and morphologies of Y nanozeolites were investigated with field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) analysis, X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and transition electron microscopy (TEM). It was found that when poly­(vinyl alcohol) is present during heating step, it can impact the size of the Y zeolite crystals. The pure Y nanozeolites with the size <30 nm and excellent textural properties (V total = 0.73 cm3/g and S BET = 816 m2/g) were obtained after an aging period of 24 h and a heating step at 100 °C during 5 h. This novel synthesis could contribute to overcoming the challenges of obtaining various nanozeolites under high-temperature synthesis for a short time instead of low-temperature synthesis for a long time.

Facile Hydrothermal Synthesis of Hierarchical Sodium P Zeolite as a Nonphosphate Detergent Builder

“…and SiO 4 4− tetrahedral sharing oxygen atoms in their corners (Anbia et al, 2015;Anbia et al, 2017;Dehghan and Anbia, 2018;Garshasbi et al, 2017;Anbia, 2016, 2019). So far, many studies have been reported about the role of zeolites frameworks LTA (Linde Type A) and FAU (Faujasite) as builder in detergent formulations (Ayele et al, 2016;Cardoso et al, 2015a;Çulfaz, 1999;Donevska et al, 1985;Hui and Chao, 2006).…”

“…In these classes, zeolites are famous as eco‐friendly inorganic builders. In fact, zeolites, as well‐known micro‐porous molecular sieves with extensive catalytic, adsorptive, and ion‐exchange applications, possess many frameworks topologies formed by primary AlO 4 5− and SiO 4 4− tetrahedral sharing oxygen atoms in their corners (Anbia et al, 2015; Anbia et al, 2017; Dehghan and Anbia, 2018; Garshasbi et al, 2017; Koohsaryan and Anbia, 2016, 2019). So far, many studies have been reported about the role of zeolites frameworks LTA (Linde Type A) and FAU (Faujasite) as builder in detergent formulations (Ayele et al, 2016; Cardoso et al, 2015a; Çulfaz, 1999; Donevska et al, 1985; Hui and Chao, 2006).…”

Organic Mesopore Generating Agents (OMeGAs) for Hierarchical Zeolites: Combining Functions on Multiple Scales

“…[25c] The interactions between the ZGMs and the growing zeolite framework can include van der Waals forces, electrostatic interactions, hydrogen bonding, and π-π stacking. [6,29] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 the ZGM decreases the size of zeolite crystals because they act as colloidal stabilizer by adsorbing on crystal and/or precursor surfaces and inhibiting particle growth or attachment via steric stabilization, suppresses precursor aggregation and inhibits the kinetic rate of crystal growth. [26]…”