., Syukri et al. Natural Zeolits and Its Modifications with Protons and Copper As the Catalyst for Esterification of Ethanol with Acetic Acid. KnE Engineering, [S. l.], v. 4, n. 2, p. 296–306, 2019. DOI: 10.18502/keg.v1i2.4454. Disponível em: https://knepublishing.com/index.php/KnE-Engineering/article/view/4454. Acesso em: 6 jul. 2025.