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Catalysis by intermetallic compounds II. The behaviour of the pseudobinary alloy systems CeRh 3– x Pd x and ZrRh 3– x Pd x for buta‐1,3‐diene hydrogenation
Author(s) -
Bahia Amrik,
Harris I. Rex,
King Charles E.,
Winterbottom John M.
Publication year - 1994
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280600402
Subject(s) - intermetallic , cerium , alloy , catalysis , materials science , zirconium , oxide , cerium oxide , bar (unit) , thermodynamics , nial , zirconium alloy , chemistry , crystallography , metallurgy , physics , organic chemistry , meteorology
The hydrogenation of buta‐1,3‐diene in the temperature range 45–110°C at 1 bar (101·5 kPa) total pressure has been studied using the pseudo‐binary alloy systems MRh 3– x Pd x (M = Ce, Zr; 0 ≤ x ≤ 3) as catalysts. Characterisation studies show that surface and bulk Rh/Pd ratios are very similar but the surfaces were enriched particularly in cerium, with strong indications of oxide formation. Similar conclusions can be drawn with respect to zirconium but to a smaller extent. Differencs in product distributions, particularly in butene distributions are discussed in terms of two mechanisms which can interpret differences between the Rh‐rich system and the Pd‐rich system in respect of cis/trans ‐but‐2‐ene ratios.