Abstract
Thermal decomposition of [Rh(CO) 2Cl] 2 was studied on two different Al 2O 3 substrates prepared by oxidation of Al(100) with O 2. Treatment of Al(100) with 1700 L O 2 at 200°C produced an 18 Å Al 2O 3 film. Oxidation of Al(100) with 4 × 10 −3 Torr of O 2 595°C formed an oxide overlayer greater than 80 Å thick. Thermal decomposition of [Rh(CO) 2Cl] 2 on the two Al 2O 3 films was monitored with TPD, XPS, and AES. TPD data obtained during thermal decomposition of [Rh(CO) 2Cl] 2 showed a marked difference in the CO evolution profiles on the two different substrates. The maximum in CO evolution varied by 125°C on the two samples. CO chemisorption measurements showed the formation of 120 Å Rh particles on the thin (18 Å) Al 2O 3 support and 20 Å Rh particles on the thick oxide overlayer. XPS data indicated that Rh o particles were present in both cases. The results suggest that structural differences in the two supports control the decomposition mechanism and therefore the resultant Rh particle size.
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