The strong reactions of Lewis-base noble-metals with vanadium and other acidic transition metals
The noble metals often thought of as unreactive solids,react strongly with nearly 40% of the elements in the periodictable: group IIIB-VB transition metals, lanthanides, theactinides, and group IIIA-IVA non-transition metals. These strong reactions arise from increased bonding/electron transfer fromnonbonding electrons d electron pairs on the noble metal tovacant orbitals on V, etc. This effect is a generalized Lewis acid-base interaction. The partial Gibbs energy of V in the noblemetals has been measured as a function of concentration at a temperature near 1000C. Thermodynamics of the intermetallics are determined by ternary oxide equilibria, ternary carbide equilibria, and the high-temperature galvanic cell technique. These experimental methods use equilibrated solid composite mixtures in which grains of V oxides or of V carbides are interspersed with grains of V-NM(noble-metal) alloys. In equilibrium the activity of V in the oxide or the carbide equals the activity in the alloy. Consequently, the thermodynamics available in the literature for the V oxides and V carbides are reviewed. Test runs on the galvanic cell were attempted. The V oxide electrode reacts with CaF[sub 2], ThO[sub 2], YDT(0.85ThO[sub 2]-0.15YO[sub 1.5]), and LDT(0.85ThO[sub 2]- 0.15LaO[sub 1.5]) to interfere with the measured data observed toward the beginning of a galvanic cell experiment are the most accurate. The interaction of vanadium at infinite dilution in the noble-metals was determined.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7180549
- Report Number(s):
- LBL-32737; ON: DE93002552
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
Similar Records
The generalized Lewis acid-base titration of palladium and niobium
Thermochemical properties of group IVB and VB transition metal alloys with platinum group metals: acid-base stabilization
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
PLATINUM METAL ALLOYS
INTERMETALLIC COMPOUNDS
PLATINUM METALS
CHEMICAL REACTIONS
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENTS
VANADIUM
VANADIUM ALLOYS
ELECTRON TRANSFER
LEWIS ACIDS
LEWIS BASES
PHASE DIAGRAMS
ALLOYS
BASES
DIAGRAMS
ELEMENTS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
400201* - Chemical & Physicochemical Properties
360102 - Metals & Alloys- Structure & Phase Studies
400400 - Electrochemistry