The recent studies on synthesis and characterization of hierarchical zeolites and their catalytic activities in organic reactions

Synthesis, characterization, and application of hierarchical zeolites are becoming a subject of increasing interest among scientists. Hierarchical zeolites possessing secondary porosity at meso- and macro- scale, imposed on primary microporous structures are an original class of porous materials exhibiting both molecular sieving ability and fast mass transport [1]. These materials, due to the combination of catalytic properties of conventional zeolites with enhanced access and transport of reagents in additional meso- or micro- porosity, constitute an effective solution to the problem of mass transport. Several innovative methods have been presented to produce hierarchical zeolite, including removal of framework atoms, surfactant-assisted recrystallization method, dual templating with surfactants, zeolitization of materials, nanoparticle assembly, and template-assisted synthesis [2]. In this presentation, besides defining the concept of hierarchical zeolite, zeolitization of materials and dual templating with surfactant methods are discussed.