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The preparation of the precursor: please see the experimental section of

14.  H.G. Zhu, Z. Ma, J.C. Clark, Z.W. Pan, S.H. Overbury, S. Dai*, Low-Temperature CO Oxidation on Au/Fumed SiO2-based Catalysts Prepared from Au(en)2Cl3 Precursor, Applied Catalysis A: General 326 (2007) 89-99.
http://dx.doi.org/10.1016/j.apcata.2007.04.004

Some details on the preparation temperature and duration: see the
experimental section of

22.  H.F. Yin, Z. Ma, S.H. Overbury, S. Dai*, Promotion of Au(en)2Cl3-Derived Au/Fumed SiO2 by Treatment with KMnO4, Journal of Physical Chemistry C, in press. http://dx.doi.org/10.1021/jp800797t
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