Oxides of rare-earth elements in lower oxidation states

Journal Article · Tue Mar 10 04:00:00 EST 1987 · Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States)

OSTI ID:6418216

Slovetskaya, K I; Khodakov, Yu S; Rubinshtein, A M; Minachev, Kh M

Metal atoms in an oxidation state lower than three are formed in high-temperature reduction of lanthanum, neodymium, and dysprosium oxides by hydrogen. The minimum temperature for the formation of these atoms is 500/sup 0/C, and their greatest amount is observed at 700/sup 0/C. The metal atoms in a low oxidation state in lanthanum, neodymium, and dysprosium oxides are stable in a medium containing less than 10/sup -6/ vol. % oxygen. At high oxygen concentrations, they are oxidized to the formal state of (III). There is a directly proportional relation between the amount of reduced neodymium atoms formed after reduction of the oxide and its activity in ethylene hydrogenation (after vacuum heat treatment of the oxide).

• Research Organization: N.D. Zelinskii Institute of Organic Chemistry, Moscow, USSR
• OSTI ID: 6418216
• Journal Information: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States), Journal Name: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States) Vol. 35:9; ISSN BACCA
• Country of Publication: United States
• Language: Russian

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKENES
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DYSPROSIUM COMPOUNDS
DYSPROSIUM OXIDES
ELEMENTS
ETHYLENE
HEAT TREATMENTS
HETEROGENEOUS CATALYSIS
HYDROCARBONS
HYDROGEN
HYDROGENATION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
QUANTITY RATIO
RARE EARTH COMPOUNDS
REDOX POTENTIAL
REDUCTION
TEMPERATURE DEPENDENCE
VALENCE