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Small Au Nanoparticles Supported on MCM-41 Containing a Surfactant

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Abstract

Gold nanoparticles (AuNPs) have been incorporated into undoped Si-MCM-41 by direct one-pot and post-synthesis approaches. Through a “modified deposition–precipitation” (mDP) method, whereby ethylenediamine served as both a base and complexing agent for the Au(III) species, Au nanoparticles have been prepared exclusively inside the pore channels of Si-MCM-41 materials. The method exploits Coulombic interactions between the occluded cationic surfactant template and the anionic [AuCl4]− to yield a controlled distribution and in-pore generation of AuNPs, i.e., DP of the Au precursor was aided by electrostatics. This method is simple and yields well-dispersed gold nanoparticles (AuNPs). The nanoparticles inside the matrix were seen to aggregate and migrate to the surface upon calcination at 500 °C, but showed a narrow Au particle size distribution. The nanocomposite materials synthesized in this study exhibited catalytic activity for the CO oxidation reaction, with CO conversion of <100% even at temperatures as high as 500 °C.

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Acknowledgments

This work was supported by the NRF (IRDP) and the NSF USA-South Africa program on Catalysis by Gold, Grant, CTS-0121619. Part of this work was carried out at the University of New Mexico where the reactor studies and HRTEM experiments were carried out. Mangesh Bore and Kelvin Lester (UNM) helped with the HRTEM microanalysis. The University of the North (presently the University of Limpopo) is gratefully acknowledged for granting study leave to M. P. Mokhonoana for PhD studies.

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Authors and Affiliations

  1. Department of Chemistry, School of Physical and Mineral Sciences, University of Limpopo, P/Bag X1106, Sovenga, 0727, Polokwane, Republic of South Africa

    Malose P. Mokhonoana

  2. Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, P/Bag 3, WITS, 2050, Johannesburg, Republic of South Africa

    Malose P. Mokhonoana & Neil J. Coville

  3. Department of Chemical & Nuclear Engineering, Center for Microengineered Materials, University of New Mexico, MSC 01 1120, Albuquerque, NM, 87131-0001, USA

    Abhaya K. Datye

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  1. Malose P. Mokhonoana
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  2. Neil J. Coville
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  3. Abhaya K. Datye
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Correspondence to Malose P. Mokhonoana.

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Mokhonoana, M.P., Coville, N.J. & Datye, A.K. Small Au Nanoparticles Supported on MCM-41 Containing a Surfactant. Catal Lett 135, 1–9 (2010). https://doi.org/10.1007/s10562-010-0300-9

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  • DOI: https://doi.org/10.1007/s10562-010-0300-9

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