Specific surface area of molybdena in MoO/sub 3//SiO/sub 2/ catalysts

Journal Article · Wed Oct 01 04:00:00 EDT 1980 · J. Catal.; (United States)

OSTI ID:6592331

Garcia Fierro, J L; Mendioroz, S; Pajares, J A; Weller, S W

Oxygen chemisorption has been used for determination of the specific molybdena area in a series of MoO/sub 3/ (4.8 to 13.0 wt%)/SiO/sub 2/ catalysts. The experiments were carried out gravimetrically with samples quantitatively reduced to MoO/sub 2/. MoO/sub 2/ samples with a high surface area (50 to 80 m/sup 2/ g/sup -1/) were used to determine a factor for relating oxygen chemisorption to equivalent molybdena area. In the range 77 to 195/sup 0/K, temperature had no effect on the amount of chemisorbed oxygen on both unsupported and supported samples. The equivalent molybdena areas in the supported samples correspond to relatively low coverages of the silica surface. The particle size deduced from oxygen chemisorption for reduced MoO/sub 3/(13.0%)/SiO/sub 2/ was 69 A, higher than that of 25 A for a reduced MoO/sub 3/ (15%)/Al/sub 2/O/sub 3/ catalyst, in agreement with the weaker interaction with silica. A higher value (approx. = 200 A) is calculated from x-ray diffraction line broadening.

• Research Organization: State Univ. of New York, Buffalo
• OSTI ID: 6592331
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 65:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

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CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
DATA
DESULFURIZATION
ELEMENTS
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGENATION
INFORMATION
MINERALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SURFACE AREA
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS