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The rational synthesis of metal-acid bifunctional catalysts based on aluminosilicates will involve control over which domain – alumina or silica – the metal can be deposited on, as well as the control of particle size. These factors determine the ratio and proximity of the metal and acid sites. The control of adsorption selectivity and particle size has been studied by measuring the uptake of anionic...
The adsorption of Pt(NH 3 ) 4+2 onto five different amorphous silicas (fumed and precipitated) was studied as a function of pH and concentration of platinum in solution. The ability of silica to protonate and deprotonate as a function of pH leads to an electrostatic attraction of the +2 platinum cation in the basic pH range, where the silica surface is negatively charged...
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