Metallic Aluminum Content in Catalysts

Umarov Shavkat Isomiddinovich; Farmanov Behzod Ilhomovich; Jo‘rayev Mahmudjon To‘lqin o‘g‘li

Authors

Umarov Shavkat Isomiddinovich Professor of the Department of Chemistry, Jizzakh State Pedagogical University, Doctor of Technical Sciences (DSc)
Farmanov Behzod Ilhomovich Head of the Department of Chemical Engineering and Biotechnology, Karshi State Technical University, Associate Professor, Doctor of Philosophy in Technical Sciences (PhD)
Jo‘rayev Mahmudjon To‘lqin o‘g‘li Master’s Student, Department of Chemical Engineering and Biotechnology, Karshi State Technical University

Keywords:

Fischer–Tropsch Synthesis, Cobalt Catalyst, Zeolite, Hydrophilicity, Hydrophobicity, Metallic Aluminum, Catalyst Deactivation, Synthetic Crude Oil

Abstract

Water is an inevitable by-product of Fischer–Tropsch synthesis (FTS). Accumulation of water in the reaction medium can lead to oxidation and sintering of cobalt particles and reduce catalyst lifetime. This study investigates the influence of incorporating zeolites with different cationic forms into cobalt-based FTS catalysts and examines how the hydrophilicity/hydrophobicity of the zeolite–water interface affects catalyst performance. Metallic aluminum content in catalysts was monitored before and after 120 hours of FTS. Results show that H-form zeolites protect metallic aluminum from oxidation due to competitive adsorption of hydrocarbons, whereas hydrophilic zeolites allow greater oxidation. The findings indicate that selecting appropriate zeolites can control interfacial hydrophobicity, minimize metal oxidation, and influence the composition of synthetic crude oil products.