Reactive lattice oxygen sites for C sub 4 -hydrocarbon selective oxidation over. beta. -VOPO sub 4
- Iowa State Univ., Ames (USA)
The role of lattice oxygen species in the catalytic oxidation of n-butene to maleic anhydride has been investigated using {beta}-VOPO{sub 4} labeled with {sup 18}O. The catalyst was prepared by stoichiometric reaction of (VO){sub 2}P{sub 2}O{sub 7} with {sup 18}O{sub 2} using solid state preparation techniques. The {beta}-VOPO{sub 7/2} {sup 18}O{sub 1/2} was characterized using laser Raman and Fourier transform infrared spectroscopies: preferential incorporation at P-O-V sites was observed. A pulse reactor was used to react n-butane, 1-butene, 1,3-butadiene, furan, {gamma}-butyrolactone, and maleic anhydride with the catalyst in the absence of gas-phase O{sub 2}. Incorporation of {sup 18}O into the products was monitored by mass spectrometry. Specific lattice oxygen sites could be associated with the reaction pathways for selective or nonselective oxidation. The results of this study also indicate that the initial interaction of n-butane with {beta}-VOPO{sub 4} is fundamentally different from the initial interaction of olefins or oxygenated species. The approach used in this research-referred to as Isotopic Reactive-Site Mapping-is a potentially powerful method for probing the reactive lattice sites of other selective oxidation catalysts.
- OSTI ID:
- 5648115
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 128:1; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALKANES
ALKENES
ANHYDRIDES
BUTADIENE
BUTANE
BUTENES
CARBOXYLIC ACIDS
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DICARBOXYLIC ACIDS
DIENES
ELEMENTS
EVEN-EVEN NUCLEI
FOURIER TRANSFORMATION
FURANS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
ISOTOPES
KINETICS
LABELLED COMPOUNDS
LASER SPECTROSCOPY
LIGHT NUCLEI
MALEIC ACID
MASS SPECTROSCOPY
NONMETALS
NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PHOSPHATES
PHOSPHORUS COMPOUNDS
POLYENES
RAMAN SPECTROSCOPY
REACTION KINETICS
REFORMER PROCESSES
SPECTRA
SPECTROSCOPY
STABLE ISOTOPES
SURFACE PROPERTIES
SYNTHESIS
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES
VANADIUM PHOSPHATES