Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 2, Issue 2, Pages 588-593Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am9009023
Keywords
boehmite; acidity; gamma-alumina; mesoporous alumina; nitrogen adsorption; temperature programmed desorption
Funding
- National Science Foundation [CHE-0649017]
- Kent State University (KSU)
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Mesoporous alumina was synthesized using commercial boehmite in the presence of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer Pluronic P123. Its calcination at 400 degrees C yielded gamma-alumina, in contrast to the ordered mesoporous alumina (OMA) obtained by hydrolysis of aluminum alkoxide in the presence of the same triblock copolymer. This synthesis afforded boehmite-based mesoporous alumina (BMA) with better adsorption properties and higher thermal stability in comparison to the alkoxide-based OMA, which remained amorphous after calcination below 900 degrees C. The BMA materials also exhibited higher amount of acidic and basic sites as evidenced by ammonia (NH3) and carbon dioxide (CO2) temperature programmed desorption (TPD), respectively. Dispersion of commercial boehmite precursor under microwave irradiation afforded BMA materials with similar surface characteristics as chose of the corresponding BMA samples obtained under conventional conditions, but showing slightly lower acidity and better basic properties. Thus, the dispersion method of boehmite can be used to modify the surface properties of the resulting BMA samples without sacrificing their porosity.
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