Assessment of γ-AL2O3 Prepared from Local Clay as an Effective Catalyst for Thermal Cracking of Atmospheric Residue: Optimizations of Variables and Analysis of the Upgraded Liquid Oil: Assessment of γ-AL2O3 Prepared from Local Clay as an Effective Catalyst. RSCI. 2026;35(1):82-93. doi:10.33899/rsci.v35i1.61994