Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

Abstract

The Plackett-Burman method was used to identify and rank most affective parameters on hydrothermal synthesis and properties of the 13X zeolite powder with gel composition of Al 2 O 3 :aSiO 2 :bNa 2 O:cH 2 O. The affective parameters of SiO 2 /Al 2 O 3 ratio, synthesis mixture alkalinity, synthesis temperature, and water content were selected for further study of their impacts and gel composition optimization using the Taguchi method. The synthesized powders were characterized by XRD and SEM analysis. Synthesis temperature and mixture alkalinity were found as the most affecting parameters on the 13X zeolite synthesis at the best gel composition of Al 2 O 3 :5.4SiO 2 : 13Na 2 O: 840H 2 O. Then 13X zeolite membranes were synthesized on the seeded supports using the optimum gel composition and impacts of synthesis temperature and time and coating layer number on their H 2 and CO 2 permeances and ideal H 2 /CO 2 selectivity were studied. The optimum 13X zeolite membrane for H 2 /CO 2 separation was obtained by three layer coatings at 80°C for 16 h with H 2 permeance of 2.88 cm 3 cm −2 .Pa.s and ideal H 2 /CO 2 selectivity of 4.72.

Conversion of Harmful Fly Ash Residue to Zeolites: Innovative Processes Focusing on Maximum Activation, Extraction, and Utilization of Aluminosilicate

“…In this study, a single parameter (pH) was investigated for replacing Na 2 O/SiO 2 and H 2 O/SiO 2 in the 13X and ZSM-5 syntheses. The upper limit of the SiO 2 /Al 2 O 3 molar ratio for precursors of pure 13X syntheses ever reported has not exceeded 5.4. , This was the first attempt to synthesize 13X in this ultra-high silicon (SAR = 12) environment.…”

“…The upper limit of the SiO 2 /Al 2 O 3 molar ratio for precursors of pure 13X syntheses ever reported has not exceeded 5.4. 44 , 45 This was the first attempt to synthesize 13X in this ultra-high silicon (SAR = 12) environment.…”

Zeolite-based catalytic membrane reactors for thermo-catalytic conversion of CO2

“…Apart from seeding, the formation of zeolite membranes is influenced by the pH value. For example, when a low concentration of OH − was fed in the mother liquor, the densification and complexation of silicate species were poor; however, a high pH value might slow down the Si-O-Si bond hydrolysis and crystal growth, and even cause the zeolite dissolution and silicate conversion, thus generating defects in the membrane layer ( Hazrati et al., 2018 ; Hayakawa and Himeno, 2020 ; Pourazar et al., 2020 ). Therefore, a medium amount of OH − was favored due to the accelerated nucleation kinetics and small crystal size ( Wang et al., 2019b ; Araki et al., 2021 ).…”

Preparation and characterization of poly(vinylidene fluoride)‐13X zeolite mixed matrix membranes for lithium ion batteries' separator with enhanced performance

“…Gathered XRD Pattern of Powders NaA Zeolite Main Peaks 13X Zeolite Main Peaks F I G U R E 2 X-ray diffraction pattern of the prepared 13X zeolite particles [40] [Color figure can be viewed at wileyonlinelibrary.com] F I G U R E 3 Scanning electron microscopy (SEM) micrographs of the synthesized 13X zeolite particles layer of the separators. [54,55] As the stable casted solution comes into contact with the nonsolvent of water, all the system constituents mass transfer start from their higher chemical potential (i.e., concentration) to the lower regions to form a thermodynamically metastable system eventuates in a rich phase of polymer crystal nuclei which terminates as the solidified polymer phase via crystallization.…”

“…Zeolites are hydrated crystalline aluminosilicates where tetrahedral units of SiO 4 unit presents a negative charge to its containing zeolite framework, where can be balanced by the framework's extra protons or metal cations. [38][39][40] Wu et al fabricated composite separators by dip coating of Al 2 O 3 nanoparticles on ultrafine PVDF fibers and compared the resultant separator performance with neat PVDF fiber and commercial PP separator. Their results revealed the separator good thermal stability for 1 hr treatment at 140 C with less than 2% thermal shrinkage compared with the commercial PP and the neat electrospun PVDF separators (4.5%).…”