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

Campoverde, Jhuliana; Guaya, Diana

doi:10.3390/nano13081295

Cited by 4 publications

(1 citation statement)

References 52 publications

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“…Researchers are increasingly focusing on the study of zeolite synthesis, seeking to develop more sustainable [4][5][6], efficient [7], and economical [8] routes; explore different structural properties [9]; and examine their use in alternative processes [5,[10][11][12]. These studies are significant as parameters such as the Si/Al ratio in the gel, the solid/liquid ratio, alkalinity, crystallization time, and temperature are crucial factors in achieving the desired structure during settling [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Cation Exchange of LTA Zeolites Synthesized from Different Silicon Sources Applied in CO2 Adsorption

da Silva,

Elias,

Cruz

et al. 2024

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Zeolites have a well-ordered crystalline network with pores controlled in the synthesis process. Their composition comprises silicon and aluminum, so industrial residues with this composition can be used for the synthesis of zeolites. The use of zeolites for CO2 adsorption is feasible due to the characteristics that these materials have; in particular, zeolites with a low Si/Al ratio have greater gas adsorption capacities. In this work, the synthesis of LTA (Linde Type A) zeolites from silica fumes obtained from the industrial LIASA process and light coal ash is presented. We explore three different synthesis routes, where the synthesized materials undergo cation exchange and are applied in CO2 adsorption processes. Studying the synthesis processes, it is observed that all materials present characteristic diffractions for the LTA zeolite, as well as presenting specific areas between 6 and 19 m2/g and average pore distributions of 0.50 nm; however, the silica fume yielded better synthesis results, due to its lower impurity content compared to the light coal ash (which contains impurities such as quartz present in the zeolite). When applied for CO2 adsorption, the standard materials after cation exchange showed greater adsorption capacities, followed by the zeolites synthesized from silica fume and, finally, the zeolites synthesized from coal ash. By analyzing the selectivity of the materials for CO2/N2, it is observed that the materials in sodium form present greater selectivity when compared to the calcium-based materials.

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