화학공학소재연구정보센터
Materials Chemistry and Physics, Vol.147, No.3, 1003-1008, 2014
Preparation of granular X-type zeolite/activated carbon composite from elutrilithe by adding pitch and solid SiO2
The preparation of granular X-type zeolite/activated carbon composites from a locally available elutrilithe by adding pitch powder and solid SiO2 was studied, and the variations in the synthesis process of zeolite X were investigated. The preparation steps of the composite involved (1) calcination of pre-shaped mixture (2) activation of the carbonaceous material from elutrilithe and pitch to prepare activated carbon and (3) hydrothermal conversion (zeolitisation) of aluminosilicate in elutrilithe and additional SiO2 to zeolite X in alkaline medium. The adding of additional SiO2 in the reaction system to adjust SiO2/Al2O3 ratio of the reaction mixture was necessary for the formation of zeolite X. The characterization of XRD, SEM and N-2 adsorption of the resulting composites had a hierarchical pore structure, which shows that pure X-type zeolite phase with high crystallinity could be obtained regardless of the content of carbon in the composites. (C) 2014 Elsevier B.V. All rights reserved.