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Size-dependent electronic modification of supported ruthenium crystallites by adsorbed chlorine

Conference · · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)
OSTI ID:5459171
;
The effect of chlorine adatoms on the chemisorptive properties of alumina and silica supported ruthenium crystallites has been investigated over a range of crystallite sizes. Electronegative chlorine adatoms appear to preferentially adsorb on higher coordination surface sites and to inhibit electron donation to incoming hydrogen molecules at lower coordination sites. As a consequence, hydrogen chemisorption on these low coordination sites becomes activated. This effect is observed to increase as the average crystallite size is reduced. This phenomenon can have a significant impact on the measurement of supported ruthenium surface areas, possibly leading to a greater than two fold underestimation in the number of surface ruthenium atoms.
Research Organization:
Dept. of Chemical Engineering, Auburn Univ., Auburn, AL
OSTI ID:
5459171
Report Number(s):
CONF-860425-
Conference Information:
Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 31:1
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
CHLORIDES
CHLORINE
CHLORINE COMPOUNDS
COORDINATION VALENCES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRICAL PROPERTIES
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HALOGENS
HYDROGEN
KINETICS
METALS
MINERALS
NONMETALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PLATINUM METALS
QUANTITY RATIO
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
RUTHENIUM
RUTHENIUM CHLORIDES
RUTHENIUM COMPOUNDS
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SORPTION
SORPTIVE PROPERTIES
SURFACE AREA
SURFACE PROPERTIES
TITRATION
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VALENCE