Abstract:Selective hydrogenation of citral was investigated over Au-based bimetallic catalysts in the environmentally benign supercritical carbon dioxide (scCO 2 ) medium. The catalytic performances were different in citral hydrogenation when Pd or Ru was mixed (physically and chemically) with Au. Compared with the corresponding monometallic catalyst, the total conversion and the selectivity to citronellal (CAL) were significantly enhanced over TiO 2 supported Pd and Au bimetallic catalysts (physically and chemically m… Show more
“…Thus, in comparison with the pure noble metal or Ni 2 P catalysts, the synergistic effect of the hydrodeoxygenation from Pd and the deoxygenation and carbonyl hydrogenation from Ni 2 P gives rise to the increment in the hydrodeoxygenation activity and the differences in the selectivity of the noble metal-Ni 2 P catalysts as well as higher reaction temperatures and longer times. In addition, the catalytic activities over the supported catalysts were compared with that of a mixture of 1% Pd/SiO 2 and 10% Ni 2 P/SiO 2 17 (Fig. 4 and Table S1 †).…”
1% Pd–10% Ni2P/SiO2, from a Ni2P reducing noble metal precursor, presents a high activity and cyclohexanol or cyclohexane selectivity due to more active sites and electrons transferring from Ni2P to the noble metal.
“…Thus, in comparison with the pure noble metal or Ni 2 P catalysts, the synergistic effect of the hydrodeoxygenation from Pd and the deoxygenation and carbonyl hydrogenation from Ni 2 P gives rise to the increment in the hydrodeoxygenation activity and the differences in the selectivity of the noble metal-Ni 2 P catalysts as well as higher reaction temperatures and longer times. In addition, the catalytic activities over the supported catalysts were compared with that of a mixture of 1% Pd/SiO 2 and 10% Ni 2 P/SiO 2 17 (Fig. 4 and Table S1 †).…”
1% Pd–10% Ni2P/SiO2, from a Ni2P reducing noble metal precursor, presents a high activity and cyclohexanol or cyclohexane selectivity due to more active sites and electrons transferring from Ni2P to the noble metal.
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