SUSTAINABLE ZEOLITE BETA FROM FLY ASH: A GREEN PATHWAY TO CATALYTIC MATERIALS . International Journal of Engineering Research and Science & Technology, [S. l.], v. 17, n. 4, p. 60–67, 2021. DOI: 10.62643/. Disponível em: https://ijerst.org/index.php/ijerst/article/view/1354. Acesso em: 27 jun. 2026.