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Conversion of Fly Ash into Mesoporous Aluminosilicate Hsiao-Lan Chang, Chang-Min Chun, Ilhan A. Aksay, and Wei-Heng Shih*,
 

Summary: Conversion of Fly Ash into Mesoporous Aluminosilicate
Hsiao-Lan Chang, Chang-Min Chun, Ilhan A. Aksay, and Wei-Heng Shih*,
Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104-2875, and
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544-5263
Mesoporous aluminosilicate in the hexagonal phase (MCM-41) has been synthesized from fused
fly ash solutions and cationic cetyltrimethylammonium bromide (CTAB) surfactants. We provide
direct evidence that an MCM-41 aluminosilicate with a homogeneous chemical composition of
Si/Al ) 13.4 can be prepared with cationic surfactant. Our results indicate that coal combustion
byproducts can be utilized for producing mesoporous molecular sieves even though they contain
significant amounts of impurities.
Introduction
Mesoscopic inorganics can be processed by mixing
cationic surfactants with an inorganic precursor in
aqueous solutions.1 After calcination, the organic phase
is pyrolyzed and the remaining mesoporous inorganic
phase contains periodic nanometer size pores that are
either hexagonally (MCM-41) or cubically arranged
(MCM-48). Most of the mesoporous molecular sieves
made thus far have been aluminosilicates or silicates.2-4

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science