Assay of molybdena/alumina catalysts by oxygen chemisorption

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/S0021-9517(79)80035-4· OSTI ID:6320506

Millman, W S; Hall, W K

The chemisorption technique used by Parekh and Weller was improved to extend to less extensively reduced catalysts which exhibits a large amount of chemisorption. Pulses of oxygen in helium were passed over the catalyst at 78/sup 0/K to saturation and the reversibly adsorbed fraction desorbed by heating to 195/sup 0/K and retained in a silica trap at 78/sup 0/K for determination. Application of this method to molybdena catalysts whose degree of reduction was characterized showed that oxygen chemisorption was linearly related to anion vacancies and to the rate of propylene hydrogenation. The oxygen chemisorption vs. anion vacancy plot did not go through the origin, as apparently the first vacancies formed in the reduction are inactive for oxygen chemisorption.

• Research Organization: Univ. of Wisconsin, Milwaukee
• OSTI ID: 6320506
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 59:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANIONS
CATALYSTS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISORPTION
ELEMENTS
IONS
METALS
MOLYBDENUM
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REDUCTION
SEPARATION PROCESSES
SORPTION
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
TRANSITION ELEMENTS