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.
On the reactivity of K2O‐, CaO‐ and P2O5‐doped nickel molybdate catalysts in a periodic‐flow reactor
DEL ROSSO, RENATO;MAZZOCCHIA, CARLO VITTORIO;GRONCHI, PAOLO;CENTOLA, PAOLO
1999-01-01
Abstract
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
