Super high selectivity of acrolein in oxidation of propene on molybdenum promoted hierarchical assembly of bismuth tungstate nanoflakes

Bismuth molybdates prepared by solution combustion synthesis for the partial oxidation of propene

“…In agreement with the literature, these results highlight the predisposition of the bismuth molybdates' structure to change. The best catalytic performances were obtained when the surface of the oxide was maintained in a slightly reduced state, as it is the case for the fresh materials prepared by SCS [33,38]. At the opposite, the formation of more stable oxides that results from the calcination treatment, or from the time on stream under the reactive flow, is responsible for a higher intrinsic activity, and higher propene reaction rate, but a lower acrolein selectivity.…”

Recent Advances in Selective Propylene Oxidation over Bismuth Molybdate Based Catalysts: Synthetic, Spectroscopic, and Theoretical Approaches

“…146 An accurate control of this phase interaction on a nano level is desired and necessary. 147 Such an assembling of nanosized constituents to larger structures often takes advantage of synergy and surface effects. For instance, a structured combination of MoO 3 nanobelts with Bi 2 Mo 3 O 12 148 and a hierarchical BiWO 4 nanoflake assembly with MoO 3 147 led to catalysts that were highly active in propylene oxidation.…”

Surface Structure and Photocatalytic Properties of Bi2WO6 Nanoplatelets Modified by Molybdena Islands from Chemical Vapor Deposition

“…Thus, Bi 2 WO 6 is used in heterogeneous selective oxidation reactions such as the selective oxidation of propene to acrolein and in the oxidative dehydrogenation of 1-butene to butadiene. 21 Pure Bi 2 WO 6 was reported to show only poor catalytic activity and selectivity in these heterogeneous reactions, whereas the addition of molybdena was shown to drastically improve the catalytic performance of the material. 21 For example, Ding and coworkers 21 prepared molybdena-promoted hierarchically assembled bismuth tungstate nanoflakes via impregnation of ammonium molybdate with superior activity for the selective oxidation of propene to acrolein.…”

“…21 Pure Bi 2 WO 6 was reported to show only poor catalytic activity and selectivity in these heterogeneous reactions, whereas the addition of molybdena was shown to drastically improve the catalytic performance of the material. 21 For example, Ding and coworkers 21 prepared molybdena-promoted hierarchically assembled bismuth tungstate nanoflakes via impregnation of ammonium molybdate with superior activity for the selective oxidation of propene to acrolein. While the exact nature of the molybdena surface species was not fully resolved, it was suggested that the formation of a surface bismuth molybdate phase plays a crucial role in the catalytic activity of the prepared samples.…”

“…The structure consists of alternating fluorite-like (Bi 2 O 2 ) 2+ layers and perovskite-like (MoO 4 ) 2– or (WO 4 ) 2– layers. Thus, Bi 2 WO 6 is used in heterogeneous selective oxidation reactions such as the selective oxidation of propene to acrolein and in the oxidative dehydrogenation of 1-butene to butadiene . Pure Bi 2 WO 6 was reported to show only poor catalytic activity and selectivity in these heterogeneous reactions, whereas the addition of molybdena was shown to drastically improve the catalytic performance of the material .…”