The influence of fullerenes and related support materials on the catalytic properties of ruthenium was investigated The catalytic behaviour of catalysts based on C-60, raw fullerene black, extracted fullerene black, cathode deposit, and graphite was examined using low-temperature CO hydrogenation and liquid-phase hydrogenation of 2-cyclohexenone at atmospheric pressure. The relevance of non-six-membered carbon rings (NSMCR) in support materials on the stability and catalytic performance of the Ru particles will be illustrated.