Studies of the hydrogen held by solids. XXV. The proton resonance from H/sub 2/ adsorbed on alumina and molybdena-alumina catalysts

Journal Article · Tue Jan 01 04:00:00 EST 1980 · J. Catal.; (United States)

OSTI ID:5440255

Cirillo, Jr, A C; Dereppe, J M; Hall, W K

An NMR study of the low-temperature adsorption of hydrogen on alumina and molybdena-alumina catalysts has led to the detection of at least two, and on extensively reduced molybdena-alumina catalysts, three, types of adsorbed hydrogen species. A single, averaged absorption line was observed originating from fast exchange between a small amount of strongly chemisorbed gas and the majority species which was molecular and much more weakly held. On alumina and unreduced molybdena-alumina the strongly chemisorbed species is also thought to be molecular, but evidence was obtained for dissociative adsorption on extensively reduced catalysts at low coverage. The signal width for the latter was that of the alumina surface hydroxyl groups; it remained constant with increasing coverage while the signal intensity increased. 12 figures, 4 tables.

• Research Organization: Univ. of Wisconsin, Milwaukee
• OSTI ID: 5440255
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 61:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CRYOGENIC FLUIDS
DATA
DATA FORMS
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
GASES
HYDROGEN
INFORMATION
ISOLATED VALUES
LINE WIDTHS
LOW PRESSURE
LOW TEMPERATURE
MAGNETIC RESONANCE
MIXTURES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PRESSURE DEPENDENCE
REDUCTION
RESONANCE
SEPARATION PROCESSES
SORPTION
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS