tThe solution combustion method (SCS) is demonstrated as an easy and fast alternative method allowingthe synthesis of mixed oxides with thermally sensitive metals, still keeping a good control on their stoi-chiometry and phase composition. Bismuth molybdates with different theoretical Bi/Mo atomic ratios,namely -Bi2Mo3O12, -Bi2Mo2O9, and -Bi2MoO6were synthesized by the SCS, fully characterized byXRD, 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 theoreti-cal values and very good catalytic properties namely high propene conversion (from 13.4 to 23.4%) andacrolein selectivity (from 71.5 to 80.0%) at 425◦C. A high purity of the SCS prepared bismuth molybdateswas obtained by means of a subsequent calcination treatment. Such treatment did not alter the highcatalytic activity of the catalysts, which slightly increased (from 12.3 to 25.5%), but induced a markedloss of acrolein selectivity (from 66.2 to 48.4%) at 425◦C. This effect is due to a strong increase of theoxidation states of Mo and Bi and reduction of the specific surface area during the calcination.
Bismuth molybdates prepared by solution combustion synthesis for the partial oxidation of propene / Farin, B.; Monteverde Videla, A.H.; Specchia, S.; Gaigneaux, E.M.. - In: CATALYSIS TODAY. - ISSN 0920-5861. - STAMPA. - 257:1(2015), pp. 11-17.
|Titolo:||Bismuth molybdates prepared by solution combustion synthesis for the partial oxidation of propene|
|Data di pubblicazione:||2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.cattod.2015.03.045|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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