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Synthesis and characterization of highly crystalline Na‐X zeolite from class F fly ash
Author(s) -
Golbad Saeed,
Khoshnoud Parisa,
Keleney Garrett,
AbuZahra Nidal
Publication year - 2020
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12468
Subject(s) - faujasite , zeolite , fly ash , chemical engineering , alkalinity , physisorption , crystallization , molecular sieve , aluminosilicate , materials science , sodalite , ion exchange , mullite , adsorption , mineralogy , chemistry , catalysis , metallurgy , organic chemistry , ion , ceramic , engineering , composite material
The aim of this research is to illustrate the feasibility of transforming a byproduct of coal combustion process (fly ash) into a highly crystalline zeolite with enhanced ion exchange capacity and molecular sieving ability that can be used in various phase separation applications. The main crystalline phases present were: α‐quartz, Mullite, Hematite, Magnetite and Lime. The hydrothermal synthesis process resulted in the formation of a Na‐A in low alkalinity, and Na‐X (Na 88 Al 88 Si 104 O 384 (H 2 O) 172.1 ) in higher alkalinity – classified as FAU (Faujasite). Physisorption analysis using BET method revealed the presence of micropores. Cation exchange capacity increased, as high as 374 meq/g, by increasing the crystallization time. Highly ordered pore structure, enhanced specific surface area and the presence of a negative charge in the framework of Na‐X zeolite (FAU) make it a strong adsorbent and an effective molecular sieve with high shape/size selectivity for various applications, including petroleum refinery catalytic cracking units.