Surface analysis of Raney nickel alloys

Journal Article · Fri May 01 04:00:00 EDT 1981 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00229a003· OSTI ID:5753092

Klein, J C; Hercules, D M

The University of Pittsburgh used electron spectroscopy for chemical analysis (ESCA), Auger electron spectroscopy (AES), and secondary ion mass spectrometry (SIMS), to study the surfaces of several polished Ni/Al (Raney nickel) alloys having different catalytic activities for hydrogenation reactions. In all cases, Al segregated to the surface, the degree of segregation increasing with the bulk concentration of Al. The solid-liquid phase diagram of the Ni/Al system can predict the segregation. Surface free-energy calculations for substitutional pure binary alloys gave qualitative agreement with the empirical results of the Ni/Al system. The lack of quantitative agreement probably resulted from the formation of intermetallic compounds and from oxidation effects. NaOH preferentially leached both NiAl/sub 3/ + eutectic and Ni/sub 2/Al/sub 3/.

• Research Organization: Univ. of Pittsburgh, PA
• OSTI ID: 5753092
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 53; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

090120* -- Hydrocarbon Fuels-- Preparation-- (1976-1989)
10 SYNTHETIC FUELS
ALLOYS
ALUMINIUM ALLOYS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
ELECTRON SPECTROSCOPY
GASIFICATION
HYDROGENATION
NICKEL ALLOYS
SPECTROSCOPY
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES