Inorganic Chemicals Industry >
Passivation mechanism of iron in catalytic cracking and its effect on catalyst′s anti⁃iron contamination performance
Received date: 2024-12-20
Online published: 2025-06-12
To enhance the resistance of catalytic cracking catalysts to iron contamination，a metal⁃trapping additive named CatClean was developed using magnesium oxide（MgO），activated alumina（Al2O3），and lanthanum nitrate［La（NO3）3］ as raw materials via a spray drying method.The resulting CatClean was primarily consist of 60% MgO and 30% La2O3，with a wear index of 1.3%/h.Iron contamination was introduced through an impregnation method，and the effects of CatClean on catalyst performance were systematically investigated using XRD，XPS，NH3-TPD，H2-TPR，and EDX-Mapping techniques.The results indicated that iron contamination significantly reduced the surface area of the catalytic cracking catalyst.Under high⁃temperature hydrothermal conditions，La2O3 in CatClean reacted with iron to form a stable LaFeO3 phase，effectively mitigating the adverse effects of iron：No formation of MgFe2O4 was detected.EDX-Mapping further revealed that iron species could migrate between catalyst and CatClean particles and be effectively captured.Performance evaluations demonstrated that at an iron contamination level of 1.0%，the addition of CatClean reduced the coke yield by 0.78%~0.98%，the dry gas yield by 0.30%~0.33%，and increased the total liquid yield by 0.91%~0.95%，without significantly affecting conversion.These findings confirmed that CatClean significantly reduced the selectivity toward undesired by⁃products and enhanced the catalyst′s resistance to iron contamination.
Key words： catalytic cracking; metal pollution; magnesium oxide; rare earth; iron
DU Xiaohui , LIU Tao , XUE Yagang , WANG Shicun , GAO Xionghou . Passivation mechanism of iron in catalytic cracking and its effect on catalyst′s anti⁃iron contamination performance[J]. Inorganic Chemicals Industry, 2026 , 58(1) : 115 -122 . DOI: 10.19964/j.issn.1006-4990.2024-0689
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