Study on the Correlation between Mass Transfer Performance and Pore Structure and Acidity of FCC Catalysts

doi:10.12422/j.issn.1006-396X.2024.03.008

Abstract

Abstract:

In order to study the correlation between the mass transfer performance of fluid catalytic cracking (FCC) catalysts and their pore structure and acidity,three semi synthetic FCC catalyst samples(CAT1,CAT2,CAT3) with different pore structure and acidity were prepared.Naphthalene,phenanthrene and acridine were selected as probe molecules to test the adsorption penetration performance of the guest molecules on the catalysts and to investigate their mass transfer performance.The ability of acid center conversion on catalysts was visualized and analyzed using super-resolution imaging technology.The results show that effective discrimination of the differential adsorption behavior of FCC catalysts for macromolecules can be achieved by selecting suitable probe molecules.The mass transfer performance of macromolecules on FCC catalysts depends on the pore structure and surface acidity of the catalysts.The use of novel macroporous matrix materials optimizes the mass transfer performance of FCC catalysts and enhances the acid on Y molecular sieves in FCC catalysts centers in FCC catalysts.The work can provide an effective solution for studying the mass transfer structure-activity relationship of FCC catalysts,and also provide theoretical guidance for the design of efficient FCC catalysts.

Key words: FCC catalysts, Mass transfer, Mesoporous, Breakthrough curve, Acidity

摘要：

为研究流化催化裂化（FCC）催化剂的传质性能与其孔结构和酸性的关联性，制备了3种具有不同孔结构和酸性的半合成FCC催化剂（CAT1、CAT2、CAT3），并对催化剂的孔结构和酸性进行了系统表征；选用萘、菲、吖啶作为探针分子，测试客体分子在催化剂上的吸附穿透性能，并考察了其传质性能；采用超分辨成像技术，对催化剂上酸中心转化能力进行了可视化分析。结果表明，通过选择合适的探针分子，可实现FCC催化剂对大分子的吸附行为差异性的有效辨析；FCC催化剂上大分子的传质性能取决于催化剂的孔结构和表面酸性；使用新型大孔基质材料可优化FCC催化剂的传质性能，提升FCC催化剂中Y分子筛上酸中心的转化能力。研究结果可为FCC催化剂传质构效关系的研究提供有效方案，并且可为高效FCC催化剂的设计提供理论指导。

关键词: FCC催化剂, 传质, 介孔, 穿透曲线, 酸性

CLC Number:

TQ021.4

Huan WANG, Xiaoyun XIONG, Yunfeng ZHENG, Xiangbo SUN, Huimin GUAN, Qiang LI, Lijuan SONG. Study on the Correlation between Mass Transfer Performance and Pore Structure and Acidity of FCC Catalysts[J]. Journal of Petrochemical Universities, 2024, 37(3): 58-65.

王焕, 熊晓云, 郑云锋, 孙祥博, 关慧敏, 李强, 宋丽娟. FCC催化剂传质性能与孔结构和酸性的关联性探究[J]. 石油化工高等学校学报, 2024, 37(3): 58-65.

Figures/Tables 11

Fig.1 N2 adsorption-desorption isotherms and mesoporous pore size distribution of three FCC catalysts

Table 1 Property parameters of three FCC catalysts

催化剂

比表面积/

（m²·g^-1）

微孔面积/

（m²·g^-1）

介孔面积/

（m²·g^-1）

总孔体积/

（cm³·g^-1）

微孔体积/

（cm³·g^-1）

介孔体积/

（cm³·g^-1）

Fig.2 NH3-TPD spectra of three catalyst samples

Table 2 Acid content distribution of three FCC catalysts

催化剂

弱酸量/（mmol·g^-1）

中强酸量/

（mmol·g^-1）

强酸量/

（mmol·g^-1）

Fig.3 The absorption breakthrough curves of naphthalene on three catalyst samples

Fig.4 The absorption breakthrough curves of phenanthrene on three catalyst samples

Fig.5 The absorption breakthrough curves of acridine on three catalyst samples

Table 3 The breakthrough and saturation adsorption time of naphthalene, phenanthrene, and acridine on three FCC catalysts

探针分子	穿透时间/min			饱和时间/min
探针分子	CAT1	CAT2	CAT3	CAT1	CAT2	CAT3
萘	10.0	10.0	6.1	46.5	40.0	28.3
菲	10.4	10.3	6.7	51.7	42.1	31.5
吖啶	37.1	35.1	11.2	162.9	114.6	74.7

Table 4 The adsorption rate constants of naphthalene, phenanthrene, and acridine on three FCC catalysts

探针分子	K_CAT1/min^-1	K_CAT2/min^-1	K_CAT3/min^-1
萘	0.324 3	0.406 9	0.591 1
菲	0.291 9	0.398 7	0.544 5
吖啶	0.092 7	0.126 9	0.232 2

Fig. 6 Fluorescence microscopic imaging of oligomerization of p-methoxystyrene on three catalyst samples

Fig.7 The number of oligomerization of p-methoxystyrene probe molecules on three catalyst samples

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