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Redox processes at the surfaces of Fe/sub 2/O/sub 3/-MoO/sub 3//SiO/sub 2/ catalysts

Journal Article · · J. Catal.; (United States)
OSTI ID:6337220
 [1];
  1. Univ. Parma
+ Show Author Affiliations
Redox processes at the surfaces of Fe/sub 2/O/sub 3/-MoO/sub 3//SiO2 catalysts were studied by Moessbauer spectroscopy of catalysts containing 2.3% Fe/sub 2/O/sub 3/ and MoO/sub 3/ (2:1 molybdenum-iron mole ratio) on silica supports of 0.5-300 sq m/g surface area before and after reaction with methanol in a fluidized bed at 260/sup 0/-320/sup 0/C. An analysis of the spectra indicated that the active catalyst species reacts with the support surface to form a thin layer and that the active iron molybdate grows only on this film. The activity and selectivity for the conversion of methanol to formaldehyde did not change significantly with increasing surface area of the support up to approx. 40 sq m/g; they decreased rapidly with increasing surface area at higher surface areas, as the active iron molybdate decomposed by reaction with the surface.
OSTI ID:
6337220
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 62:1; ISSN JCTLA
Country of Publication:
United States
Language:
English

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALCOHOLS
ALDEHYDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYSTAL GROWTH
DATA
DECOMPOSITION
ELEMENTS
EXPERIMENTAL DATA
FILMS
FLUIDIZED BED
FORMALDEHYDE
GAMMA SPECTROMETERS
HIGH TEMPERATURE
HYDROXY COMPOUNDS
INFORMATION
IRON
IRON COMPOUNDS
IRON OXIDES
MEASURING INSTRUMENTS
METALS
METHANOL
MINERALS
MOESSBAUER SPECTROMETERS
MOLYBDATES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
QUANTITY RATIO
REDOX PROCESS
REFRACTORY METAL COMPOUNDS
REPROCESSING
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SPECIFICITY
SPECTROMETERS
SURFACE AREA
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
USES