ALKHAFAJI , H. M. H. . Improving Fuel Product Quality from Catalytic Cracking Units in Oil Refineries Using a Co-HfO2/Mesoporous SiO2 Nanocomposite Catalyst . Journal of Petroleum Research and Studies, [S. l.], v. 15, n. 1, p. 143-166, 2025. DOI: 10.52716/jprs.v15i1.907. Disponível em: https://jprs.gov.iq/index.php/jprs/article/view/907. Acesso em: 29 mar. 2025.