A study of the CO[sub 2] chemisorption on supported molybdena-alumina catalysts

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Journal of Catalysis; (United States)

OSTI ID:5224411

A series of molybdena-alumina catalysts (1.3-8.2 wt% Mo) was prepared by the adsorption equilibrium method. The solids were studied using IR spectroscopy and CO[sub 2] chemisorption to establish the feasibility of using the latter as a convenient method for determining surface coverage in molybdena-alumina catalysts. The volumetric results showed a strong decrease in the amount of chemisorbed CO[sub 2] as the metal loading was increased. The IR data showed that the decrease in CO[sub 2] chemisorption, with Mo loading, does not correlate with a decrease in the total alumina surface area. Rather, it correlates with a decrease in the number of high-frequency hydroxyl groups to which carbon dioxide and molybdena species are selectively chemisorbed. These results strongly suggest that the use of the CO[sub 2] chemisorption to measure the surface coverage by molybdena leads to an overestimation of the latter. 12 refs., 2 figs., 2 tabs.

• OSTI ID: 5224411
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 144:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS