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Mesoporous Co–B amorphous alloy films with enhanced catalytic efficiency prepared from a mixed-surfactant solution

Published online by Cambridge University Press:  31 January 2011

Hui Li ,
Jun Liu ,
Haixia Yang  and
Hexing Li
Hui Li*
Affiliation:
Department of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
Jun Liu
Affiliation:
Department of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
Haixia Yang
Affiliation:
Department of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
Hexing Li
Affiliation:
Department of Chemistry, Shanghai Normal University, Shanghai 200234, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Co–B films were synthesized through the solvent evaporation-assisted chemical reduction method by using a mixed-surfactant solution containing Span 40 and (1S)-(+)-10-camphorsulfonic acid. With the characterization of x-ray diffraction, selected-area electron diffraction, x-ray photoelectron spectroscopy, scanning electron micrography, and transmission electron micrography, the resulting Co–B films were identified to be amorphous alloys with mesoporous structure. The synergistic effect of two kinds of surfactants is essential for the formation of mesoporous structure. During liquid-phase cinnamaldehyde hydrogenation to cinnamyl alcohol, the mesoporous Co–B amorphous alloy films exhibited a much higher activity and better selectivity than the solid Co–B nanoparticles prepared by direct reduction of cobalt ions with borohydride. The enhanced activity is attributed to both the mesoporous and the film structure, which provides more Co active sites for the adsorption and diffusion of reactant molecules. The improved selectivity may be related to the difference in surface curvature.

Keywords

AmorphousCatalyticNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 11 , November 2009 , pp. 3300 - 3307
Copyright
Copyright © Materials Research Society 2009

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