Gold loading

J. P. and Moller, M. (2001) Excimer laser ablation of gold-loaded inverse polystyrene-block-poly (2-vinylpyridine) micelles. Appl. Phys. A, 72, 679-685. 

In this section a study on the gold loading capacity of the XC72R carbon is reported. 

Figure 4.1 Gold loading and yield of DP versus solution pH for Au/Ti02 (Degussa P-25) catalysts prepared by DP (NaOH added to the suspension, preparation at 343K, nominal Au loading 13wt.%).62...

Table 4.4 Au/oxide samples prepared by DP with urea at 353 K with a nominal gold loading of 8wt.%.37,52...

The advantage of this technique is that Au° is directly deposited onto the support, the particles are small, the sample is free of chloride, and it is easy to control the gold loading. The disadvantage is that the preparation must be performed in the absence of water and requires a specific reactor and an evaporator. 

This method has not been used very much to prepare bimetallic particles. It is always performed at fixed pH as in Section 4.2.3, i.e. the same recipe was applied without attempt to understand the underlying chemistry. Platinum-gold and palladium-gold (Pt or Pd Au = 5 95) have been deposited this way on titania-silica supports.66 After calcination at 673 K, the particles are small (<5nm), and no separate platinum or palladium metal particles are found. With Pd-Au/CeC>2 (Pd Au = 2 to 100) calcined at 673 K, however, only large gold particles (>8nm) and small palladium particles (<3nm) were found at gold loadings above lwt.%.184... 

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