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- Title
Sites for the selective hydrogenation of ethyne to ethene on supported NiO/Au catalysts.
- Authors
Nikolaev, S.; Pichugina, D.; Mukhamedzyanova, D.
- Abstract
Au, NiO, and NiO/Au clusters of 2.5-16 nm, supported on AlO, ZrO, TiO, 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 812-1,023 to 276 h. 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 TOF - TOF - TOF was 1,466; 1,147; 563; and 569 h for NiO/Au/AlO NiO/Au/TiO, NiO/Au/ZnO, and NiO/Au/ZrO, respectively. The reasons of the observed catalytic trends and the origin of the most active and selective sites are discussed.
- Subjects
ACETYLENE; HYDROGENATION; GOLD catalysts; TURNOVER frequency (Catalysis); THERMAL stability; NICKEL oxide
- Publication
Gold Bulletin, 2012, Vol 45, Issue 4, p221
- ISSN
1027-8591
- Publication type
Article
- DOI
10.1007/s13404-012-0066-5