(544dx) Influence of Salt on Nanozeolite-Y Particles Size Synthesized Under Organic Template Free Condition

Authors: 
Radman, H., ADNOC refining research center
Dabbawala, A., Khalifa University of Science and Technology
Al Wahedi, Y., Khalifa University of Science and Technology
Singaravel, G. P., ADNOC Refining Research Center
Morin, S., ADNOC Refining Research Center
Berthod, M., ADNOC Refining Research Center
Alhassan, S., Khalifa University of Science and Technology

Influence of salt on Nanozeolite-Y particles
size synthesized under organic template free Condition

Hanin M. Radmana,b, Aasif A. Dabbawalaa,
Yasser F. Alwahedia,
Gnana P. Singaravelb,
Stephane Morinb, Mikael Berthodb and Saeed M. Alhassana*

a Materials and catalysis division, Chemical
engineering department, Khalifa University of Science and Technology, Abu
Dhabi, UAE

b Catalysis division, ADNOC refining research
center, Abu Dhabi, UAE

Corresponding E-mail: saeed.alkhazraji@ku.ac.ae

 

ABSTRACT

Zeolites (crystalline
aluminosilicate) having 3D channel network are widely used by the chemical
industry. Faujasite Y in particular is one of preferred micro-sized zeolite to
be utilized as acid catalyst for catalytic cracking process. Considering the important
applications of zeolite-Y, current research is directed to modify its surface properties and
catalytic performance. Synthesis of zeolite-Y in nano-size is one
approach to overcome
shortcomings in the micro-sized zeolite-Y. However, the preparation of nanozeolite
still remains a challenging task which requires either tertiary amine based organic
template or higher amount of NaOH to control the size. On the other hand a
template free methodology has many advantages in which sodium cations can solely
act as structure directing agent. Nevertheless, the increase of alkalinity may lead
to re-dissolution of growing crystals and reduce Si/Al ratio. Herein, we present
synthesis of nanozeolite with optimum amount of NaOH and by balancing Na
content using inorganic salt. Surprisingly, the addition of alkali metal salt as
secondary source for Na+ alters zeolite-Y particle size without
reducing Si/Al ratio. Depending on the method used (clear or dense-gel), the
growth of nano-size crystals was affected by the amount of salt added during
synthesis (Scheme 1).
In clear-solution (CS) method, the increase of salt content led to a decrease in
crystal size from 165 to 110 nm. In contrast, in dense -gel (DG) method, the crystal size is found to increase from
140 to 250 nm.

Scheme 1: Influence
of salt on synthesis of nano-size zeolite-Y by template free method.

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