Catalytic activity of transition metal borides in the oxidation of hydrogen

Journal Article · Fri May 01 00:00:00 EDT 1987 · Kinet. Catal. (Engl. Transl.); (United States)

OSTI ID:5845803

Vlasenko, N V; Il'chenko, N I; Golodets, G I

The specific catalytic activity of transition metal borides in the oxidation of hydrogen at 593/sup 0/K in excess O/sub 2/ decreases in the series: Ni/sub 2/B > Mo/sub 2/B/sub 5/ > W/sub 2/B/sub 5/ > VB/sub 2/ > CrB/sub 2/ > TaB/sub 2/ > NbB/sub 2/, ZrB/sub 2/ > TiB/sub 2/ >> Co/sub 3/B, HfB/sub 2/. The reaction rate is a function of the rate of the reaction of H/sub 2/ with adsorbed oxygen ZO and decreases with decreasing Z-O bond energy. A higher rate is found in the case of excess H/sub 2/ (Ni/sub 2/B > Co/sub 3/B > ZrB/sub 2/ > VB/sub 2/ > W/sub 2/B/sub 5/, HfB/sub 2/ > Mo/sub 2/B/sub 5/ > TaB/sub 2/ > CrB/sub 2/ > TiB/sub 2/, NbB/sub 2/) as a result of the participation of dissociatively adsorbed hydrogen. The rates of hydrogen oxidation on metal-like borides and carbides were compared and the differences found were explained.

• Research Organization: L. V. Pisarzhevskii Institute of Physical Chemistry, Kiev, USSR
• OSTI ID: 5845803
• Journal Information: Kinet. Catal. (Engl. Transl.); (United States), Journal Name: Kinet. Catal. (Engl. Transl.); (United States) Vol. 27:6; ISSN KICAA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ADSORPTION
BORIDES
BORON COMPOUNDS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
CHROMIUM BORIDES
CHROMIUM COMPOUNDS
COBALT BORIDES
COBALT COMPOUNDS
COMPARATIVE EVALUATIONS
ELEMENTS
ENERGY
HAFNIUM BORIDES
HAFNIUM COMPOUNDS
HETEROGENEOUS CATALYSIS
HYDROGEN
KINETICS
MOLYBDENUM BORIDES
MOLYBDENUM COMPOUNDS
NICKEL BORIDES
NICKEL COMPOUNDS
NIOBIUM BORIDES
NIOBIUM COMPOUNDS
NONMETALS
OXIDATION
REACTION KINETICS
REDOX POTENTIAL
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TANTALUM BORIDES
TANTALUM COMPOUNDS
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN BORIDES
TUNGSTEN COMPOUNDS
VANADIUM BORIDES
VANADIUM COMPOUNDS
ZIRCONIUM BORIDES
ZIRCONIUM COMPOUNDS