Recent Advances in the use of Catalysts to Improve the Efficiency of Oil Sludge Pyrolysis
Nurgaliyev N.U. Aibuldinov Y.K. Kopishev E.E. Iskakova Z.B. Kolpek A. Sabitov A.S. Alzhanova G.Z. Abdiyussupov G.G. Omirzak M.T.
October 2025Engineered Science Publisher
Engineered Science
2025#37
Oil sludge (OS) remains challenging to manage due to toxic metals and recalcitrant hydrocarbons. Among available treatments, pyrolysis enables energy recovery while limiting formation of dioxins and particulates; however, redistribution of metals and heteroatoms during conversion necessitates stringent emissions control and product upgrading. This review synthesizes recent advances in catalytic co-pyrolysis of OS using metal oxides (including nanostructured), mesoporous zeolites, and molecular sieves. This review evaluate how catalyst composition, acidity, and textural properties shape product yields and composition; suppress sulfurand nitrogen-bearing species (e.g., H2S); enhance char adsorption capacity; and influence kinetics (activation energy, rates), conversion, liquid-phase viscosity, and overall process efficiency. The analysis identifies catalyst systems and operating windows that improve oil quality and reduce environmental risks, and outlines remaining barriers and priorities for scale-up.
Catalytic pyrolysis , Co-pyrolysis , Energy recovery , Hazardous waste valorization , Heavy metal immobilization , Metal oxides , Molecular sieves , Oil sludge , Pyrolysis oil quality , Zeolites
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Research Institute of New Chemical Technologies, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Chemistry, Chemical Technology and Ecology, Kazakh University of Technology and Business, Astana, 010000, Kazakhstan
Department of Chemistry, Faculty of Natural Sciences, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Research Institute of New Chemical Technologies
Department of Chemistry
Department of Chemistry
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