TITLE:
Synthesis of ZSM-22 in Static and Dynamic System Using Seeds
AUTHORS:
Lenivaldo V. de Sousa Júnior, Antonio O. S. Silva, Bruno J. B. Silva, Soraya L. Alencar
KEYWORDS:
ZSM-22; Seeds; Zeolite; 1, 6-Diaminohexane
JOURNAL NAME:
Modern Research in Catalysis,
Vol.3 No.2,
March
28,
2014
ABSTRACT: ZSM-22 was synthesized using various sources of
silica, organic template 1,6-diaminohexane, under hydrothermal conditions, with
and without agitation during crystallization. Subsequently, the crystallized
material was used as seeds to accelerate the crystallization process.
Characterization of the ZSM-22 samples was performed by XRD, ATG/DTG and FT-IR.
It was found that it is possible to synthesize ZSM-22 employing colloidal
silica and pyrolytic silica as silicon sources only if the system is stirred
during crystallization. The crystallization time for these systems was 13
hours, longer times of crystallization do not significantly increase the
crystallinity of the sample. The addition of seeds significantly accelerates
the crystallization of ZSM-22, reducing the crystallization time to only 7
hours, with stirring and with systems employing colloidal silica.