Fourier transform infrared spectroscopic studies of the reactivity of vanadia-titania catalysts toward olefins. 1. Propylene
- Universita di Genova (Italy)
The adsorption and transformation of propylene and of several O-containing C{sub 3} organic molecules (namely isopropyl alcohol, acetone, allyl alcohol, acrolein, and acrylic acid) on vanadia-titania in the temperature range 150-673 K have been investigated by IR spectroscopy. At low temperatures (150-200 K), propylene adsorbs as such through {pi}-bonding and reacts later to give an adsorbed species identified tentatively as an allyl radical. Alternatively, it undergoes addition by a surface OH group to given an isopropoxy species. At least two main surface pathways for propylene transformation are active, leading to surface species functionalized at C{sub 2} (isopropoxy species and acetone) and at C{sub 1} (acrolein and acrylates) as well as products arising from coupling of the allyl radical. The results are discussed in relation to literature data concerning the heterogeneously catalyzed selective oxidation of propylene carried out on vanadia-titania as well as on bismuth-molybdate-based catalysts.
- OSTI ID:
- 5978765
- Journal Information:
- Journal of Physical Chemistry; (USA), Vol. 94:26; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
PROPYLENE
ADSORPTION
TITANIUM OXIDES
CATALYTIC EFFECTS
VANADIUM OXIDES
EXPERIMENTAL DATA
HIGH TEMPERATURE
INFRARED SPECTRA
LOW TEMPERATURE
MEASURING METHODS
ALKENES
CHALCOGENIDES
DATA
HYDROCARBONS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SORPTION
SPECTRA
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
020500* - Petroleum- Products & By-Products
400102 - Chemical & Spectral Procedures