Posted February 18, 2017 by Rino Rakhmata Mukti, Dr. rer.nat in Uncategorized

Laboratory for Zeolite Synthesis and Catalysis

Mesoporogen-free Synthesis of Zeolites at Low Temperature

In this study, we develop new method for synthesizing hierarchically porous zeolites which leads to the synthesis at low temperature in the presence of a reduced amount of OSDA (organic structure directing agent) and in the absence of any mesoporogen. The OSDA seems to play an additional role as a nontemplating SDA for mesopore generation. Our study also showed that the control of the molar composition is essential for the crystallization of hierarchically porous zeolite.

Drastic Reduction of OSDA amount in Zeolite Synthesis

In this study, the drastic reduction of OSDA in the synthesis of zeolite is attempted. The use of OSDA is applied as one-fifth or one-twentiegth of typical amount reported in literatures. Upon OSDA reduction, the crystallization leads to the formation of zeolite with hierarchical pore structure revealed by advanced characterization techniques such as SEM and TEM.

Interzeolite transformation

The seed-assisted of CHA-type zeolite with complete exclusion of OSDA can be resulted from the interzeolite transformation of FAU-type zeolite. The resulted products may exhibit higher Si/Al ratio as a result of the epitaxial growth on the surface of the seeds. The seeds with Si/Al ratio of 2 are normally produced from the hydrothermal conversion of FAU-type zeolite. The synthesis of CHA-type zeolite can be performed by adding the seeds in the initial mixture prior to the hydrothermal treatment. Thus, the performed synthesis is completely free of OSDA. The XRD patterns are used to show the zeolite structure and to further prove the role of seeds with respect to zeolite crystal growth.

For futher information, please contact Dr. Rino R. Mukti