Synergistic and size effects in selective hydrogenation of alkynes on gold nanocomposites
作者： S.A. Nikolaev , V.V. Smirnov
DOI: 10.1016/J.CATTOD.2009.07.032
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摘要: Abstract Au/Al2O3 nanocomposites possess high activity and stability in the selective hydrogenation of phenylacetylene at 423 K. Strong dependences selectivity on particle size were revealed: as diameter gold nanoparticles was decreased from 30 to 2.5 nm, TOF increased 0.028 0.142 s−1 styrene formation by an order magnitude. The same trends observed acetylene into ethylene supported gold. nature obtained is discussed terms “Geometric” “Electronic” effects. A synergistic catalytic effect revealed for Au-Ni/Al2O3: conversion Au-Ni catalysts higher than sum conversions Au Ni appearance Au-Ni/Al2O3 new Aσ+ sites with improved adsorption properties due electron transfer oxidized nickel.
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