Structure and activity of tellurium/molybdenum oxide acrylonitrile catalysts. [Ammoxidation]
The tellurium/molybdenum mixed oxides ((TeMo)O) catalyst system was investigated as part of the development of an industrial cerium/tellurium/molybdenum mixed oxides catalyst for propylene ammoxidation Catalysts containing 25% active phase on silica were prepared, characterized by BET surface area measurement, mercury porosimetry, X-ray diffraction, and optical microscopy, and tested for the ammoxidation of propylene at 400/sup 0/-460/sup 0/C in a flow reactor. The results suggested that Te/sub 2/MoO/sub 7/ is the active phase. The mechanism probably involves activation of propylene on a tellurium site and oxygen insertion at isolated and highly distorted MoO/sub 6/ octahedral sites. The addition of cerium to the binary catalyst prevents the reductive degradation of (TeMo)O which occurs under reactor flow conditions by a phase-separation process.
- Research Organization:
- Montedison Res. Lab.
- OSTI ID:
- 6313834
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 64:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Pyridines by propylene ammoxidation: catalyst structure and reaction selectivity
Electron microscopy of some molybdenum oxide phases after use as catalysts in oxidative ammonolysis and ammoxidation of toluene
Related Subjects
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACRYLONITRILE
ALKENES
CATALYTIC EFFECTS
CERIUM
CHALCOGENIDES
CHEMICAL ACTIVATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMICAL REACTORS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELEMENTS
HIGH TEMPERATURE
HYDROCARBONS
KINETICS
METALS
MINERALS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NITRILES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POROSITY
PROPYLENE
RARE EARTHS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SCATTERING
SILICA
SILICON COMPOUNDS
SILICON OXIDES
STRUCTURAL CHEMICAL ANALYSIS
SURFACE PROPERTIES
TELLURIUM COMPOUNDS
TELLURIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION