Platinum-group metals high-temperature properties

The most effective and commonly used catalysts for oxidation reactions come from the noble metals group. Platinum, either alone or in combination with other noble metals, is by far the most commonly used. Platinum is desirable because it gives a high oxidation activity level at low temperatures, is stable at high temperatures, and is chemically inert. Palladium is another noble metal that exhibits these properties and is sometimes used in catalytic incinerators. 

Although the most well established function of the support is to disperse the metal and to retard the sintering, recent works on metal-support interaction collected in (1) have shown that the chemi-sorptive and catalytic activity of group VIII metals were considerably lowered when the metal was supported on reducible oxide, such as Ti02, and reduced at high temperature. The objective of the work reported in this paper was to further investigate the role of the support on the adsorptive and on the catalytic properties of platinum. 

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