Caio Tagusagawa, Atsushi Takagaki, K. Takanabe
Mar 22, 2010
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Influential Citations
42
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Journal
Journal of Catalysis
Abstract
Abstract Layered and nanosheet aggregates of HTaMoO 6 were examined as solid acid catalysts. The HTaMoO 6 aggregated nanosheets were formed by soft chemical processing of layered HTaMoO 6 using tetra ( n -butylammonium) hydroxide. The catalytic activity and acid properties of the HTaMoO 6 compounds were compared with those of layered HNbMoO 6 and a range of conventional solid acids. The catalytic activity of HTaMoO 6 for Friedel–Crafts alkylation with benzyl alcohol, hydrolysis of disaccharides, and esterification of acetic acid and lactic acid increased after exfoliation and aggregation, consistent with the acid strengths determined by NH 3 temperature-programmed desorption and 31 P magic-angle spinning nuclear magnetic resonance spectroscopy measurements. HTaMoO 6 nanosheets possess additional strong acid sites on the oxide formed by exposure of a single layer, along with strong acid sites within the interlayer of the layered aggregate structure, resulting in higher acid catalytic activity than that of the original layered oxide.