Influence of surface composition on selectivity of Zr-Ni-Co-H system in conversions of 1-hexene

Autor: Ashraf, Z. Kahn, Shpiro, E. S., Érivanskaya, L. A., Lunin, V. V., Antoshin, G. V., Minachev, Kh. M.
Zdroj: Russian Chemical Bulletin; September 1985, Vol. 34 Issue: 9 p1802-1807, 6p
Abstrakt: 1.As a result of air oxidation of the hydride ZrNi0.16Co0.84H1.4 at 423–573°K, the surface is strongly enriched in cobalt oxide. After reduction in hydrogen with vacuum-baking, and under the influence of the reaction medium, the relative amount of nickel in the surface layer increases.2.The selectivities of 1-hexene conversions on the original hydride ZrNi0.16Co0.84H1.4 and on this catalyst after oxidative and reductive treatment are considerably different from the selectivities of catalysts based on ZrNiH2.8 and ZrCoH2.8.3.The direction of 1-hexene conversions at 573–623°K depends on the conditions of ZrNi0.16Co0.84H1.4, oxidation: “Mild” oxidation gives a catalyst that is active mainly in shifting the double bond; “severe”, oxidation gives a catalyst that is active mainly in hydrogenation.
Databáze: Supplemental Index