%0 Journal Article
%T Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts
%A S. §¡. Nikolaev
%A D. §¡. Pichugina
%A D. F. Mukhamedzyanova
%J Gold Bulletin
%@ 2190-7579
%D 2012
%I Springer
%R 10.1007/s13404-012-0066-5
%X Au, NiO, and NiO/Au clusters of 2.5¨C16 nm, supported on Al2O3, ZrO2, TiO2, and ZnO, were studied in the purification of ethene feedstock from ethyne by hydrogenation at 357 K. The Au, NiO, and NiO/Au catalysts possessed 100 % selectivity to ethene. As the size of NiO clusters decreased from 7 to 3 nm, the turnover frequency (TOF) decreased from 812¨C1,023 to 276 h 1. In contrast with NiO, Au activity increased with decreasing particle size. NiO/Au catalysts possessed higher stability and activity in comparison with Au and NiO catalysts. The synergistic gain on NiO/Au clusters (SG) calculated as TOFNiO/Au ¨C TOFAu ¨C TOFNiO was 1,466; 1,147; 563; and 569 h 1 for NiO/Au/Al2O3, NiO/Au/TiO2, NiO/Au/ZnO, and NiO/Au/ZrO2, respectively. The reasons of the observed catalytic trends and the origin of the most active and selective sites are discussed.
%K Synergism
%K Ethyne hydrogenation
%K DFT
%K NiO/Au
%K Au
%K Heat of adsorption
%U http://link.springer.com/article/10.1007/s13404-012-0066-5