M. Arai et al., Effects of preparation variables on the activity of alumina-supported platinum catalysts for liquid phase cinnamaldehyde hydrogenation, APP CATAL A, 176(2), 1999, pp. 229-237
Alumina-supported platinum catalysts were prepared through different metal
loading and reduction procedures. The platinum precursors were loaded by im
pregnation and ion-exchange and then reduced by hydrogen at high temperatur
es and by sodium tetrahydroborate solution at a low temperature of 35 degre
es C. The low-temperature reduced (LR) catalysts were found to produce cinn
amyl alcohol in high selectivities in the liquid phase hydrogenation of cin
namaldehyde, irrespective of the method of metal loading. The high-temperat
ure reduced (HR) catalysts prepared with ion-exchange produced hydrocinnama
ldehyde and cinnamyl alcohol; the selectivity of the former was larger than
that of the latter. In contrast, the HR catalysts prepared with impregnati
on produced large amounts of by-products and small amounts of hydrocinnamal
dehyde and cinnamyl alcohol. When these HR catalysts were additionally trea
ted with sodium tetrahydroborate solution, they indicated product distribut
ions similar to the LR catalysts. (C) 1999 Elsevier Science B.V. All rights
reserved.