A study on the selection of the effective cycle base on 4 – step and 6 – step pressure swing adsorption processes for nitrogen gas production. Vietnam Journal of Catalysis and Adsorption, [S. l.], v. 8, n. 3, p. 25–31, 2019. Disponível em: https://jca.edu.vn/index.php/jca/article/view/550.. Acesso em: 31 may. 2025.