On the reactivity of K2O-, CaO- and P2O5-doped nickel molybdate catalysts in a periodic-flow reactor

The propane oxydehydrogenation with monolayer lattice oxygen of undoped and K2O–, CaO– and P2O5–NiMoO4 was investigated by using a periodic‐flow reactor (PFR). The influence of the nature and the extent of the promoter has been emphasized relative to the doped catalysts with respect to pure NiMoO4 p...

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Bibliographic Details
Published in:Catalysis letters 1999-01, Vol.63 (1-2), p.65-71
Main Authors: KADDOURI, A, DEL ROSSO, R, MAZZOCCHIA, C, GRONCHI, P, CENTOLA, P
Format: Article
Language:English
Subjects:
Calcium oxide
Catalysis
Catalysts
Catalysts: preparations and properties
Chemistry
Dependence
Depletion
Exact sciences and technology
General and physical chemistry
Molybdates
Nickel compounds
Oxygen
Phosphorus pentoxide
Propane
Propylene
Selectivity
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The propane oxydehydrogenation with monolayer lattice oxygen of undoped and K2O–, CaO– and P2O5–NiMoO4 was investigated by using a periodic‐flow reactor (PFR). The influence of the nature and the extent of the promoter has been emphasized relative to the doped catalysts with respect to pure NiMoO4 phases. It was observed that calcium and potassium promoters satisfactorily enhance propylene selectivity, and phosphorus promoter specifically increases the total activity while maintaining the propylene selectivity. Evidence found by thermogravimetric (TG) analyses (oxygen depletion rate) has shown a dependence on lattice oxygen mobility due to the presence of promoters. This dependence has been correlated to the propane conversion while the propylene selectivity was attributed to the acid–base properties.
ISSN:1011-372X
1572-879X
DOI:10.1023/A:1019036114414