A Comparison Study of the Metal Oxide Catalysts for the Conversion of Used Cooking Oil into High Grade Chemicals. Pakistan Journal of Analytical & Environmental Chemistry, Pakistan, v. 22, n. 1, p. 150–158, 2021. DOI: 10.21743/pjaec/2021.06.15. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/77. Acesso em: 5 nov. 2025.