Farin, Benjamin
[UCL]
Monteverde Videla, Alessandro
[Politecnico di Torino, Italy ]
Specchia, Stefania
[Politecnico di Torino, Italy ]
Gaigneaux, Eric M.
[UCL]
The solution combustion method (SCS) is demonstrated as an easy and fast alternative method allowing the synthesis of mixed oxides with thermally sensitive metals, still keeping a good control on their stoichiometry and phase composition. Bismuth molybdates with different theoretical Bi/Mo atomic ratios, namely α-Bi2Mo3O12, β-Bi2Mo2O9, and γ-Bi2MoO6 were synthesized by the SCS, fully characterized by XRD, Raman, SEM/EDX, BET and XPS analyses, and tested in the partial oxidation of propene to acrolein. The SCS method allowed obtaining crystalline catalysts with Bi/Mo atomic ratios close to the theoretical values and very good catalytic properties namely high propene conversion (from 13.4 to 23.4%) and acrolein selectivity (from 71.5 to 80.0%) at 425 °C. A high purity of the SCS prepared bismuth molybdates was obtained by means of a subsequent calcination treatment. Such treatment did not alter the high catalytic activity of the catalysts, which slightly increased (from 12.3 to 25.5%), but induced a marked loss of acrolein selectivity (from 66.2 to 48.4%) at 425 °C. This effect is due to a strong increase of the oxidation states of Mo and Bi and reduction of the specific surface area during the calcination.
Bibliographic reference |
Farin, Benjamin ; Monteverde Videla, Alessandro ; Specchia, Stefania ; Gaigneaux, Eric M.. Bismuth molybdates prepared by solution combustion synthesis for the partial oxidation of propene. In: Catalysis Today, Vol. 257, p. 11-17 (2015) |
Permanent URL |
http://hdl.handle.net/2078.1/165567 |