Collect. Czech. Chem. Commun. 1985, 50, 61-70

Competitive hydrogenation of unsaturated hydrocarbons on palladium catalysts modified with lead and thallium

Libor Červenýa, Ivo Pasekab, Karel Surmaa, Nguyen Thi Thanha and Vlastimil Růžičkaa

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 competitive catalytic hydrogenations of pairs of 2,5-dimethyl-2,4-hexadiene with 1-heptene and 2-octyne with 1-heptene were studied on palladium black modified with lead or thallium to various degrees of coverage. The dissolved and adsorbed hydrogen was determined electrochemically and the selectivities of the competitive hydrogenations were established. The effect of the lead or thallium ad-atoms on the hydrogenation kinetics is discussed.