Synthesis and Characterization of Zeolite Lynde Type A (LTA): Effect of Aging Time

Abstract

Zeolite Lynde Type A (LTA) has been widely applied, such as adsorbent, catalyst, membrane, ion exchanger, and even molecular sieve. As molecular sieve, the zeolite LTA has high dehydration ability and has a prospect as separation agent such as water removal from the ethanol-water mixture to obtain high purity bioethanol. Furthermore, it can repeatedly be used, lower energy usage, and environmentally friendly. Due to the number of advantages possessed, this research conducted to synthesize the zeolite LTA. The sources of silica and alumina used are from Coal Bottom Ash (CBA), PLTU Tarahan, Indonesia. CBA is a waste of coal burning that has not fully utilized. This effect of aging time was examined to obtain the highest percentage of its crystallinity. The results showed that 36 hours aging gave a product of zeolite with the best characteristics. The XRD analysis reported that this zeolite had 89.43% of crystallinity. The FTIR identification showed the presence of double rings structure which is characteristic of zeolite LTA. Finally, the result of SEM expressed the morphology of zeolite A on 3.163 μm of crystal size.

From Waste to Added-Value Product: Synthesis of Highly Crystalline LTA Zeolite from Ore Mining Tailings

“…The aging time at room temperature influenced the formation of the zeolite crystal nuclei and the crystallization rate [45]. In this study, the effect of varying the aging time was evaluated, which ranged between 18 and 32 h. It was demonstrated that the higher time used for aging, the higher content of zeolite was obtained.…”

Hydrothermal Synthesis and Characterization of Zeolite A from Corn (Zea Mays) Stover Ash

“…Naturally occurring silicas found in agricultural waste are a good substitute for commercial silica precursors. Thus, raw materials from agricultural waste, such as corncob-stalk-and-leaves ash [ 12 ], rice husk ash [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ], sugar cane bagasse ash [ 25 , 26 ], barley ash [ 27 ], coal ashes [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ], clay minerals [ 35 , 36 , 37 , 38 , 39 , 40 ], industrial slags [ 41 ], natural zeolites [ 42 ], and solid waste incineration ashes [ 43 , 44 , 45 ], are used as alternative and cheap source materials for the synthesis of zeolite. The use of agricultural waste materials, such as those in the field of water purification and in the removal of ammonium or heavy metals, makes them appealing as useful products that contribute to the mitigation of environmental problems.…”