等级孔分子筛传质性能的表征策略研究进展

doi:10.3969/j.issn.1006-396X.2021.04.001

摘要/Abstract

摘要：

等级孔分子筛材料因其兼具高效传质与择形催化的优势而成为当前分子筛研究领域热点，然而其传质优化机制的不明确是制约等级孔分子筛材料设计思路与发展方向的主要因素。简要介绍了等级孔分子筛材料研究现状，并重点对等级孔分子筛材料传质机制研究进展，包括当前研究所面临的挑战和研究策略等方面进行了综述，探讨了传质机制研究在等级孔分子筛材料研发过程的重要意义，并对未来发展方向进行了展望。

关键词: 等级孔分子筛, 孔结构, 扩散传质, 频率响应技术, 单分子跟踪技术

Abstract:

The hierarchical zeolite has become a hotspot in the current molecular sieve research field due to its advantages of efficient mass transfer and shape selection catalysis.The unclear mass transfer optimization mechanism has become a bottleneck restricting the design and development of hierarchical zeolite.This paper briefly introduces recent research and development status of the hierarchical zeolite,reviewes with emphasis the research progress in mass transfer mechanism of Hierarchical zeolite,the current research challenges and the analysis of current research strategy etc,and discussed the significance of mass transfer mechanism in the research and development of graded porous molecular sieve materials and the prospect of future development.

Key words: Hierarchical zeolite, Pore structure, Mass transfer of diffusion, Frequency response technology, Single?molecule tracking technology

中图分类号:

TE624.9

张锦研, 王焕, 秦玉才, 宋丽娟. 等级孔分子筛传质性能的表征策略研究进展[J]. 石油化工高等学校学报, 2021, 34(4): 1-8.

Jinyan Zhang, Huan Wang, Yucai Qin, Lijuan Song. Progress in Characterization Strategies Mass Transfer Mechanism of Hierarchical Zeolite[J]. Journal of Petrochemical Universities, 2021, 34(4): 1-8.

图/表 8

图1 自然界中具有等级结构体系的示例

Fig.1 An example diagram of a hierarchical system in nature

图2 等级孔材料的属性特征和分类方法示意

Fig.2 Schematic diagram of attribute characteristics and classification method of graded hole materials

图3 不同形状催化剂Thiele模数与效率因子的关系

Fig.3 Relationship between Thiele modulus and efficiency factor of catalysts with different shapes

图4 等级孔分子筛材料的分类与孔结构成因示意

Fig.4 Classification of hierarchical zeolite and pore structure genesis diagram

图5 贯通的等级孔道及其中客体分子的运行轨迹示意

Fig.5 Schematic diagram of running trajectories of perforated hierarchical channels and guest molecules

图6 计算机模拟贯通孔和孤立孔结构的有效扩散系数与平衡压力的关系

Fig.6 The relationship between effective diffusion coefficient and equilibrium pressure for through?hole and isolate?hole structures simulated by computer

图7 等级孔材料内存在复杂的传质过程

Fig.7 Complex mass transfer processes exist in hierarchical materials

图8 单分子轨迹与TEM照片的合并与关联

Fig.8 Merges and association of Single?molecule trajectories with TEM images

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