Reduction and reoxidation of multicomponent catalysts of the selective oxidation of propylene
The reduction of complex molybdenum-containing oxide catalysts Co-Mo-Bi-Fe, Mo-Bi-Fe and Co-Mo-Bi-Fe-P and their subsequent reoxidation by oxygen were studied by a microcatalytic method and by ..gamma.. resonance spectroscopy in the region of 270-390/sup 0/C. It was shown that various phases are subjected to reduction in Mo-containing oxide systems. It was established quantitatively that in the most active and selective Co-Mo-Bi-Fe catalysts of the oxidation of propylene to acrolein, reduction occurs only on account of the ferric molybdate phase. The rates and activation energies of the reduction processes were calculated. The degree of reduction of iron molybdate in a Co-Mo-Bi-Fe sample was determined by spectroscopic and kinetic methods, and the diffusion coefficients of oxygen in this catalyst was calculated. The rate of reoxidation of the catalysts is higher than the rate of their reduction and cannot be the limiting step in the oxidation of the olefin.
- Research Organization:
- Institute of Chemical Physics, Moscow, USSR
- OSTI ID:
- 5639695
- Journal Information:
- Kinet. Catal. (Engl. Transl.); (United States), Vol. 27:5; Other Information: Translated from Kinet. Katal.; 27: No. 5, 1208-1215(Sep-Oct 1986)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BISMUTH OXIDES
CATALYTIC EFFECTS
CATALYSTS
REDUCTION
REGENERATION
COBALT OXIDES
IRON OXIDES
MOLYBDENUM OXIDES
PHOSPHORUS OXIDES
PROPYLENE
HETEROGENEOUS CATALYSIS
OXIDATION
ACTIVATION ENERGY
ARRHENIUS EQUATION
GAMMA SPECTRA
OXYGEN
ALKENES
BISMUTH COMPOUNDS
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT COMPOUNDS
ELEMENTS
ENERGY
EQUATIONS
HYDROCARBONS
IRON COMPOUNDS
MOLYBDENUM COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
REFRACTORY METAL COMPOUNDS
SPECTRA
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties