E. Sulman et al., Hydrogenation of acetylene alcohols with novel Pd colloidal catalysts prepared in block copolymers micelles, J MOL CAT A, 146(1-2), 1999, pp. 265-269
Hydrogenation of the triple bond of acetylene alcohols to the double one of
olefin alcohols (linalool, isophytol) was studied with Pd colloids prepare
d in polystyrene-poly-4-vinylpyridine micelles in toluene and deposited on
Al2O3. The high selectivity (99.8% for linalool and 99.5% for isophytol) of
such catalyst is explained by durable modification of the Pd nanogarticle
surface with 4-vinylpyridine units. The activity of the Pd catalyst studied
is determined by high reactivity of small Pd nanoparticles. Maximum relati
ve rate was found to be in methanol, but the highest selectivity was achiev
ed in toluene because the latter is a selective solvent for polystyrene-pol
y-4-vinylpyridine micelles and provides the better accessibility of reactiv
e sites. (C) 1999 Elsevier Science B.V. All rights reserved.