Hydrogen--deuterium exchange catalyzed by spinel solid solutions, MgAl/sub 2-x/Cr/sub x/O/sub 4/. [120 to approximately 300K and greater than 470K]

Journal Article · Wed Sep 01 04:00:00 EDT 1976 · J. Catal.; (United States)

OSTI ID:7249001

Vickerman, J C

H/sub 2/--D/sub 2/ exchange has been studied over the spinel solid solutions MgAl/sub 2-x/Cr/sub x/O/sub 4/, where x = 0 ..-->.. 2. The catalysts x = 0.02 ..-->.. 2 displayed two zones of activity as a function of temperature, viz. 120 K to approximately 300 K and greater than 470 K, while catalysts x = 0 ..-->.. 0.023 were only active above 470 K. Activity in both temperature zones varied nonlinearly with the chromium content of the catalyst, activity generally falling to a minimum at x approximately 0.4 and then rising again to x = 2. The results are compared with those obtained on the corundum solid solutions ..cap alpha..--Al/sub 2-x/Cr/sub x/O/sub 3/. The effectiveness of the isolated sites on catalysts below x = 0.2 is discussed. Above x = 0.4, the new activity seems to be associated with the increasing ease of electron movement.

• Research Organization: Univ. of Bristol, England
• OSTI ID: 7249001
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 44:3; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400203* -- Isotope Exchange & Isotope Separation-- (-1987)
ADSORPTION
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ARRHENIUS EQUATION
CATALYTIC EFFECTS
CHALCOGENIDES
CORUNDUM
CRYOGENIC FLUIDS
DEUTERIUM
ELEMENTS
FLUIDS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MINERALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
SORPTION
SPINELS
STABLE ISOTOPES
TEMPERATURE DEPENDENCE