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Changes induced in the surface characteristics and catalytic activity of amorphous Cu‐Zr by hydrogen pretreatment
Author(s) -
Katona T.,
Molnár Á.,
Perczel I. V.,
Kopasz Cs.,
Hegedűs Z.
Publication year - 1992
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740190196
Subject(s) - ribbon , dehydrogenation , copper , differential scanning calorimetry , catalysis , hydrogen , isomerization , amorphous solid , crystallization , extrusion , chemistry , alloy , materials science , chemical engineering , crystallography , analytical chemistry (journal) , metallurgy , organic chemistry , composite material , thermodynamics , physics , engineering
Hydrogen‐treated amorphous Cu 61 Zr 39 alloy ribbon exhibits the development of characteristic formations (hemispheres) in a circular arrangement (as revealed by SEM) on both sides of the ribbon, in parallel with copper enrichment (determined by AES) and partial crystallization (determined by differential scanning calorimetry). The extrusion of pure copper is considered to be caused by hydrogen diffusing into the bulk through existing surface defects. As a consequence of the surface and structural changes, steady increases in both the copper surface area and the catalytic activity (dehydrogenation of alcohols and isomerization of allyl alcohol and 2‐propyloxirane) are demonstrated.