Catalytic Purification of Sulfur from Bituminous Impurity. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 24, n. 2, p. 155–166, 2024. DOI: 10.21743/pjaec/2023.12.04. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/56. Acesso em: 4 jul. 2025.