Hierarchical Mesoporous Zeolites of Catalysts

Dear Colleagues,

The well-defined microporous framework is the basis for the advantages of the conventional zeolites that the chemical industry utilised extensively. Concurrently, it is the cause of the limitations of zeolites too. The pore size restrictions pose a disadvantage for the use of conventional zeolites. When bulky molecules are involved in catalysis, the diffusion limitations reduce the efficiency. Coke formation is a common cause of deactivation of conventional zeolites and the pore openings can be blocked quickly in this case which wastes the valuable catalytically active sites behind.

It is therefore desirable to have zeolites with a hierarchical porosity consisting of interconnected mesopores. This can be effective in mass transfer while still possessing the highly crystalline microporous zeolite to provide high stability and catalytic activity.  It can be achieved either by the inclusion of an intra-crystalline mesopore network in zeolite crystals, or alternatively by reducing the crystal size in the nano meter region to create inter-crystalline porosity. Both approaches achieve a higher external surface area and hence a greater accessibility of active sites for diffusing molecules.

Many routes and methods have been explored in order to obtain such desirable materials, with varying degrees of success and advantages and disadvantages. The aim of this Special Issue is to report on the latest advances in the synthesis and characterization of hierarchical mesoporous zeolites. Broad contributions of original research papers, including their innovative applications, experimental and theoretical studies, bottom-up and top-down synthesis strategies are invited for submission.

Dr. Volkan Degirmenci

Guest Editor

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• Zeolite
• Hierarchical
• Mesoporous
• Self-assembly
• Soft-template
• Structure directing agent
• Cationic polymer
• Desilication
• Dealumination