A structural and thermodynamic basis for the catalytic behavior of single phase and multiphase bismuth cerium molybdate ammoxidation catalysts
The vast majority of fundamental studies of metal oxide selective oxidation catalysts have been performed with single phase systems. These investigations established the basic tenents of the redox mechanism of selective oxidation and ammoxidation catalysis. By comparison, structural and kinetic investigations of multiphase oxide catalysts are less numerous because of the inherent difficulties in understanding the relative contributions of separate phases to the catalytic behavior of the composite catalyst. Some attempts have been made in the past to understand the complex chemistry of multiphase catalysts and additional important insights have been realized more recently. However, a clear understanding of the most significant catalytic interactions between individual phases of a multiphase multicomponent redox catalyst is still lacking. In an effort to provide an understanding and a physical basis for the observed synergism in multiphase oxide catalysts, the structural and chemical features which dictate the catalytic behavior of bismuth cerium molybdate catalysts were assessed. Bismuth cerium molybdates are known to be active catalysts for the selective oxidation and ammoxidation of olefins. Compositions with superior catalytic performance have been identified in both the single phase and two phase regions of the Bi/sub 2/(MoO/sub 4/)/sub 3/ - Ce/sub 2/(MoO/sub 4/)/sub 3/ phase diagram. Hence, this catalyst system serves as a useful model for determining key structural and thermodynamic aspects of the catalytic behavior of multicomponent single phase and multiphase redox catalysts.
- Research Organization:
- Sohio Research Center, The Standard Oil Company (Ohio), Cleveland, Ohio
- OSTI ID:
- 6552293
- Report Number(s):
- CONF-830814-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Vol. 28:5; Conference: 186. national meeting of the American Chemical Society, Washington, DC, USA, 28 Aug 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKENES
AMMONOLYSIS
OXIDATION
CATALYSIS
BISMUTH COMPOUNDS
CATALYTIC EFFECTS
CERIUM COMPOUNDS
MOLYBDATES
CATALYSTS
CHEMICAL REACTION KINETICS
MOLYBDENUM OXIDES
REDOX REACTIONS
STRUCTURAL CHEMICAL ANALYSIS
THERMODYNAMICS
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
HYDROCARBONS
KINETICS
MOLYBDENUM COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION KINETICS
SOLVOLYSIS
TRANSITION ELEMENT COMPOUNDS
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