Collect. Czech. Chem. Commun. 1983, 48, 3532-3538

Selectivities of some hydrogenations on metal-modified platinum catalysts

Libor Červenýa, Karel Surmaa, Vlastimil Růžičkaa and Ivo Pasekab

a Department of Organic Technology, Prague Institute of Chemical Technology, 166 28 Prague 6
b Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


The rates and selectivities of hydrogenation on platinum catalysts modified with monolayers of copper, thallium, lead, or bismuth were studied at 20 °C and atmospheric pressure for the competitive hydrogenation of 1-hexene and 1-undecene in cyclohexane and for the consecutive hydrogenation of 1,5-cyclooctadiene in cyclohexane or ethanol. For the former system, the selectivity was unaffected by the modifying metal and the degree of the surface coverage with the metal, and the relative specific hydrogenation rate decreased only slightly with the degree of surface coverage. For the latter system, the selectivity of hydrogenation to cyclooctene increased with the content of the modifying metal, while the relative specific hydrogenation rate decreased markedly.