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Selective oxidation of propylene to acrolein by hydrothermally synthesized bismuth molybdates


Schuh, Kirsten; Kleist, Wolfgang; Høj, Martin; Trouillet, Vanessa; Beato, Pablo; Jensen, Anker D; Patzke, Greta R; Grunwaldt, Jan-Dierk (2014). Selective oxidation of propylene to acrolein by hydrothermally synthesized bismuth molybdates. Applied Catalysis A: General, 482:145-156.

Abstract

Hydrothermal synthesis has been used as a soft chemical method to prepare bismuth molybdate catalysts for the selective oxidation of propylene to acrolein. All obtained samples displayed a plate-like morphology, but their individual aspect ratios varied with the hydrothermal synthesis conditions. Application of a high Bi/Mo ratio during hydrothermal synthesis afforded γ-Bi$_2$MoO$_6$ as the main phase, whereas lower initial bismuth contents promoted the formation of α-Bi$_2$Mo$_3$O$_{12}$. Synthesis with a Bi/Mo ratio of 1:1 led to a phase mixture of α- and γ-bismuth molybdate showing high catalytic activity. The use of nitric acid during hydrothermal synthesis enhanced both propylene conversion and acrolein yield, possibly due to a change in morphology. Formation of β-Bi$_2$Mo$_2$O$_9$ was not observed under the applied conditions. In general, the catalytic performance of all samples decreased notably after calcination at 550 °C due to sintering.

Abstract

Hydrothermal synthesis has been used as a soft chemical method to prepare bismuth molybdate catalysts for the selective oxidation of propylene to acrolein. All obtained samples displayed a plate-like morphology, but their individual aspect ratios varied with the hydrothermal synthesis conditions. Application of a high Bi/Mo ratio during hydrothermal synthesis afforded γ-Bi$_2$MoO$_6$ as the main phase, whereas lower initial bismuth contents promoted the formation of α-Bi$_2$Mo$_3$O$_{12}$. Synthesis with a Bi/Mo ratio of 1:1 led to a phase mixture of α- and γ-bismuth molybdate showing high catalytic activity. The use of nitric acid during hydrothermal synthesis enhanced both propylene conversion and acrolein yield, possibly due to a change in morphology. Formation of β-Bi$_2$Mo$_2$O$_9$ was not observed under the applied conditions. In general, the catalytic performance of all samples decreased notably after calcination at 550 °C due to sintering.

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Additional indexing

Item Type:Journal Article, not refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2014
Deposited On:20 Feb 2015 10:18
Last Modified:01 Jun 2017 04:34
Publisher:Elsevier
ISSN:0926-860X
Publisher DOI:https://doi.org/10.1016/j.apcata.2014.05.038

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