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Updated: May 26, 2026

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Exploring meso-/microporous composite molecular sieves with core-shell structures.

Xufang F Qian1, Bin Li, Yuanyuan Y Hu

  • 1Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, 200433 Shanghai, PR China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 16, 2011
PubMed
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Synthesized core-shell molecular sieves with zeolite cores and mesoporous silica shells enhance adsorption and catalytic cracking. These hierarchical materials offer tunable pore sizes and graded acidity for petroleum processes.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Zeolite single crystals (ZSM-5) possess microporous structures beneficial for catalysis.
  • Achieving efficient diffusion and adsorption for larger molecules in zeolites remains a challenge.
  • Hierarchical porous materials offer improved mass transport and accessibility.

Purpose of the Study:

  • To synthesize core-shell composite molecular sieves with zeolite cores and ordered mesoporous silica shells.
  • To investigate the structural, diffusion, and adsorption properties of these novel materials.
  • To evaluate their performance in catalytic cracking reactions and assess their potential in petroleum processing.

Main Methods:

  • Surfactant-directed sol-gel synthesis using cetyltrimethylammonium bromide (CTAB) and tetraethylorthosilicate (TEOS).

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Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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  • Controlled coating of mesoporous silica shells onto ZSM-5 zeolite single crystals.
  • Characterization of pore structure, shell thickness, and acidity distribution.
  • Benzene diffusion measurements and adsorption studies with 1,3,5-triisopropylbenzene.
  • Catalytic cracking of n-dodecane as a probe reaction.

    • Main Results:

    • Uniform mesoporous silica shells (15-100 nm) were successfully coated onto ZSM-5 crystals.
    • Hierarchical pore structures with meso-/micropore junctions were formed, maintaining efficient benzene diffusion.
    • Significantly enhanced adsorption capacity for large molecules was observed compared to pristine ZSM-5.
    • Composites with introduced Al species exhibited graded acidity, from Lewis acid sites in mesopores to Brønsted and Lewis acid sites in zeolite cores.
    • The core-shell structure demonstrated superior performance in n-dodecane catalytic cracking compared to ZSM-5.

    Conclusions:

    • Core-shell composite molecular sieves offer a promising platform for enhanced catalytic applications.
    • The hierarchical pore structure and tunable graded acidity are key to their improved performance.
    • These materials show great potential for optimizing petroleum catalytic processes, particularly those involving bulky molecules.