Hierarchical Assembly of Zeolites: A Present Scenario

Farsana.O.P

Prajitha KumariEmail

Pocker Sahib Memorial Orphanage College, Tirurangadi, Malappuram, Kerala State, India-676306

Abstract

The never ending demands of various industries for improvised and more efficient zeolites have led to an enormous amount of research in the development of hierarchical zeolites. By the introduction of a hierarchy of pore sizes into the zeolitic structures, the accessibility to the interior catalytic surface has been enhanced many times leading to improved catalytic activity. The secondary pores consist of meso- and macropores which serves as an additional space for active surface and for functionalization of the surface. The most attractive feature of hierarchical zeolite is their ability for catalysing reactions involving bulky molecules without being concerned about frequent regeneration and replacement of catalysts. A wide variety of novel strategies have been developed for synthesis of hierarchical zeolites. In this review, the different synthetic methods have been categorized as destructive and constructive methods. Destructive method comprises of demetallation and irradiation, whereas the constructive method comprises of dual templating techniques, zeolitization of materials, nano particle assembly, template assisted synthesis and zeolite seeds. This review also sheds light over the large variety of industrial applications of hierarchical zeolites.

Hierarchical Assembly of Zeolites: A Present Scenario