Oxygen-carbon ratio, organometallic

Molecules with common features also are grouped into more specialized families. The compounds in one such family, carbohydrates, contain only carbon, hydrogen, and oxygen. The hydrogen and oxygen atoms are in the same ratio as in water (2H 10), hence the suffix -hydrate. Other specialized families include lei I v Ill s, alkaloids, steioids, lipids, pioteins, enzymes, vitamins, and organometallic compounds. 

Serp et al. [39] prepared activated carbon-supported platinum catalysts by chemical vapor deposition of organometallic compounds. They contacted carbon rods with a gas mixture containing He, 3% H2, and a 10 molar ratio of [Pt(CH3)2(COD)] (COD ri" -l,5-cyclooctadiene) for 12 minutes at 383 K and 50 torr. They concluded that preoxidation of the carbon support with HNO3 was a very important factor in obtaining well-dispersed platinum particles, as the oxygen surface complexes acted as anchoring centers for the platinum precursor. 

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