Crystallization kinetics of zeolite-LTL

✍ Scribed by P.N. Joshi; A.N. Kotasthane; V.P. Shiralkar

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 428 KB
• Volume: 10
• Category: Article
• ISSN: 0144-2449
• DOI: 10.1016/s0144-2449(05)80319-7

✦ Synopsis

Zeolites of Linde type L (LTL) have been synthesized at 393-453 K, and reaction parameters were found "to be influenced by the source of reactants, the oxide mole composition of the gel, the crystallization temperature and period, and K20/(K20 + Na20) ratios. As the latter decreases to 0.67, crystallization becomes faster. At lower ratios, zeolite Y instead of zeolite L is obtained. Crystallization data were analyzed in terms of a first-order kinetics equation. The apparent activation energy for nucleation (En = 27-28 kcal mole -1) and crystal growth (Ec = 17.3 kcal mole -1) were evaluated by applying the Arrhenius equation. The solid products obtained were characterized by XRD, SEM, t.g.d.t.a., i.r., and sorption properties.