Structure Formation of Activated Nickel Catalyst During Caustic Leaching of a Nickel–Aluminium Alloy
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Abstract
An activated nickel catalyst (Raney-type nickel) was produced by leaching nickel-aluminium alloys in alkali solution. The structure of this leached residue was investigated using transmission electron microscopy and X-ray diffraction. The leaching process selectively dissolves aluminium from the alloy and the remaining atoms form a nonequilibrium body-centred cubic phase of disordered nickel and aluminium atoms. This phase exists over a wide range of compositions. The further loss of aluminium leads to a rearrangement of the remaining nickel atoms into the stable face-centred cubic structure of nickel. This transformation occurs by small adjustments of nickel atoms over short distances resulting in crystallites in the size range of a few nanometers.
Abstract
Aktivierte Nickelkatalysatoren (Raney-Nickel) wurden durch Laugen einer Nickel–Aluminium-Legierung in Natronlauge hergestellt. Die Struktur des entstandenen Nickelkatalysators wurde mit Röntgendiffraktometrie und Transmissionselektronenmikroskopie untersucht. Während des Laugens wird das Aluminium selektiv aus der Legierung herausgelöst. Die verbleibenden Nickel-und Aluminiumatome ordnen sich zu einer ungeordneten kubisch-raumzentrierten Ungleichgewichtsphase an. Diese Phase besitzt einen breiten Homogenitätsbereich. Mit weiterem Herauslösen von Aluminiumatomen wandelt sie sich in die stabile kubisch-flächenzentrierte Nickel-struktur um. Die Umwandlung geschieht durch geringe Positionsverschiebungen der Atome über kurze Distanzen, was zu nanometergroßen kristallinen Bereichen führt.
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The authors thank Degussa-Hüls AG, Sivento Division for providing the specimen samples and financial support.
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© 2001 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Editorial
- In memoriam
- The Ringberg Workshop 1999 on Thermodynamic Modelling and Applications
- Aufsätze/Articles
- Using Ab Initio Calculations in the Calphad Environment
- Contributions to the Thermodynamic Modelling of Solutions
- Thermodynamic Modelling of Oxide and Oxynitride Phases
- The Modelling of Carbide, Nitride and Carbo-Nitride Phases
- Amorphous Phases in Materials Microstructure
- Experimental and Theoretical Study of the Al-Rich Corner in the Ternary Al–Ti–B System and Reassessment of the Al-Rich Side of the Binary Al–B Phase Diagram
- Evaluation of Superplastic Formability of the AZ31 Magnesium Alloy
- Characteristics of Mechanical Alloying of Zn–Al-Based Alloys
- The Effect of Sputter Cleaning and TiN Coating after Sputter Cleaning on Tensile and Fatigue Behavior of a Nodular Cast Iron
- Nucleation of Iron Nitrides during Gaseous Nitriding of Iron; Effect of a Preoxidation Treatment
- Structure Formation of Activated Nickel Catalyst During Caustic Leaching of a Nickel–Aluminium Alloy
- Experimental Study on the Electrical Conductivity and Thermo-Electromotive Force of Liquid Pb–Mg-Based Alloys
- Interfacial Reactions between the Aluminium Alloy Matrix and Intermetallic Reinforcement Particles in Novel P/M 5056/Ni3Alp Composites
- Microstructure and Devitrification Behavior of Melt-Spun Al-Rich Metallic Glasses and Nanostructured Composites
- Mitteilungen/Notifications
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences
Articles in the same Issue
- Frontmatter
- Editorial
- In memoriam
- The Ringberg Workshop 1999 on Thermodynamic Modelling and Applications
- Aufsätze/Articles
- Using Ab Initio Calculations in the Calphad Environment
- Contributions to the Thermodynamic Modelling of Solutions
- Thermodynamic Modelling of Oxide and Oxynitride Phases
- The Modelling of Carbide, Nitride and Carbo-Nitride Phases
- Amorphous Phases in Materials Microstructure
- Experimental and Theoretical Study of the Al-Rich Corner in the Ternary Al–Ti–B System and Reassessment of the Al-Rich Side of the Binary Al–B Phase Diagram
- Evaluation of Superplastic Formability of the AZ31 Magnesium Alloy
- Characteristics of Mechanical Alloying of Zn–Al-Based Alloys
- The Effect of Sputter Cleaning and TiN Coating after Sputter Cleaning on Tensile and Fatigue Behavior of a Nodular Cast Iron
- Nucleation of Iron Nitrides during Gaseous Nitriding of Iron; Effect of a Preoxidation Treatment
- Structure Formation of Activated Nickel Catalyst During Caustic Leaching of a Nickel–Aluminium Alloy
- Experimental Study on the Electrical Conductivity and Thermo-Electromotive Force of Liquid Pb–Mg-Based Alloys
- Interfacial Reactions between the Aluminium Alloy Matrix and Intermetallic Reinforcement Particles in Novel P/M 5056/Ni3Alp Composites
- Microstructure and Devitrification Behavior of Melt-Spun Al-Rich Metallic Glasses and Nanostructured Composites
- Mitteilungen/Notifications
- Personelles/Personal
- Bücher/Books
- Tagungen/Conferences
