催化裂化过程中铁的钝化机理及其对催化剂抗铁污染性能的影响

doi:10.19964/j.issn.1006-4990.2024-0689

Abstract

Abstract:

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

CLC Number:

TQ426

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.

Figures/Tables 10

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References 26

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催化剂	质量分数/%		比表面积/（m²·g^-1）			孔体积/（cm³·g^-1）
催化剂	Fe	RE₂O₃	水热处理前	水热处理后		水热处理前	水热处理后
Cat		3.20	263.5	176.5	0.354		0.221
Catw	0.91	3.21	268.4	154.9	0.341		0.161
Catw1	0.92	4.48	260.6	169.5	0.361		0.198
Catw2	0.86	4.51	261.0	171.5	0.363		0.203

催化剂	产品收率/%						总液收/%	转化率/%	选择性
催化剂	焦炭	干气	液化气	汽油	柴油	重油	总液收/%	转化率/%	焦炭	干气
Cat	4.33	2.66	25.68	51.27	11.37	4.69	88.32	83.94	0.052	0.104
Catw	7.74	3.11	25.70	47.21	11.44	4.80	84.35	83.76	0.092	0.121
Catw1	6.76	2.78	25.17	47.57	12.52	5.20	85.26	82.28	0.082	0.110
Catw2	6.96	2.81	25.42	47.73	12.15	4.93	85.30	82.92	0.084	0.111

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Passivation mechanism of iron in catalytic cracking and its effect on catalyst′s anti⁃iron contamination performance

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