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Issue 29, 2009
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On-paper synthesis of Au nanocatalysts from Au(III) complex ions for low-temperature CO oxidation

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Abstract

Au nanoparticles (AuNPs) were successfully synthesized in situ on a microstructured paper matrix composed of ceramic fibers as the main framework and ZnO whiskers as a preferential support for AuNPs. The paper-like ceramic fiber/ZnO whisker composites were prepared using a papermaking technique, then soaked in an aqueous solution of the Au(III) complex HAuCl4. AuNPs with size <10 nm were spontaneously formed on the ZnO whiskers in the absence of reducing agents, possibly due to electron transfer from Zn(II) in ZnO whiskers to Au(III) species through Zn–O–Au bonds. As-prepared AuNPs@ZnO whisker-containing paper (AuNPs@ZnO paper) is much like ordinary paper products in being flexible, lightweight and easy to handle. AuNPs@ZnO paper demonstrated excellent catalytic performance in low-temperature CO oxidation. Complete conversion of CO to CO2 was achieved at 20 °C, 140 K lower than the reaction temperature for conventional Au/ZnO catalyst powders. This facile technique has potentially broad wide applications in ‘on-paper’ synthesis of a diverse array of metal NPs. The metal NPs@ZnO paper composites with paper-like flexibility are able to fit various reactor configurations and are thus expected to be promising catalytic materials for improving the practical utility and catalytic performance of these systems, for a wide range of industrial chemical processes.

Graphical abstract: On-paper synthesis of Au nanocatalysts from Au(III) complex ions for low-temperature CO oxidation

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Article information


Submitted
23 Mar 2009
Accepted
12 May 2009
First published
17 Jun 2009

J. Mater. Chem., 2009,19, 5244-5249
Article type
Paper

On-paper synthesis of Au nanocatalysts from Au(III) complex ions for low-temperature CO oxidation

H. Koga, T. Kitaoka and H. Wariishi, J. Mater. Chem., 2009, 19, 5244
DOI: 10.1039/B905818D

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