Produção Nacional
Revisado por pares
Application of high-purity zeolite a synthesized from different coal combustion by-products in carbon dioxide capture
2019; WIT Press; Volume: 2; Issue: 3 Linguagem: Inglês
10.2495/ei-v2-n3-215-228
ISSN2398-2659
AutoresJuliana de Carvalho Izidoro, Davi Castanho, Carlos Rossati, Denise Alves Fungaro, Sabine Neusatz Guilhen, Thiago Nogueira, María de Fátima Andrade,
Tópico(s)Catalytic Processes in Materials Science
ResumoHigh-purity zeolites A were synthesized from different coal combustion by-products (baghouse filter fly ash, cyclone filter ash, and bottom ash) and characterized in terms of morphology, chemical, and mineralogical composition.The products were tested for carbon dioxide capture by using a continuous CO 2 flow system passing through a column packed with the adsorbent material, which was connected to an analyser that directly measures the concentration of CO 2 .The values of CO 2 adsorption capacities calculated for the unmodified Na-A zeolites (ZABF, ZACF, and ZABA) were 556.48, 494.29 and 654.82 mg g -1 , respectively.These values were higher than those achieved by the calcium-modified zeolite samples.ZABA adsorbent presented the best performance in CO 2 capture when compared to the other adsorbent material and achieved an adsorption capacity 32% higher than a 4A commercial zeolite.In the adsorption cycles study, the percentage of CO 2 desorption by ZABA at the second and third cycles reached 93%, showing that zeolite A can be regenerated by heating at 150 ºC.The use of coal ashes to obtain zeolites and the application of these products for the CO 2 adsorption can be an important strategy to mitigate both the problem of waste management and the greenhouse gases emission in coal-fired power plants.
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