Selective oxidation of propylene to acrolein by hydrothermally synthesized bismuth molybdates

Kirsten Schuh, Wolfgang Kleist, Martin Høj, Vanessa Troullet, Pablo Beato, Anker Degn Jensen, Greta R. Patzke, Jan-Dierk Grunwaldt

Research output: Contribution to journalJournal articleResearchpeer-review

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-Bi2MoO6 as the main phase, whereas lower initial bismuth contents promoted the formation of α-Bi2Mo 3O12. 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-Bi2Mo2O9 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. © 2014 Elsevier B.V.
Original languageEnglish
JournalApplied Catalysis A: General
Volume482
Pages (from-to)145-156
ISSN0926-860X
DOIs
Publication statusPublished - 2014

Keywords

  • Catalysis
  • Process Chemistry and Technology
  • Acrolein
  • Bismuth molybdates
  • Hydrothermal synthesis
  • Selective propylene oxidation
  • Unsupported catalysts
  • Aldehydes
  • Aspect ratio
  • Bismuth
  • Catalyst activity
  • Herbicides
  • Molybdenum compounds
  • Morphology
  • Oxidation
  • Propylene
  • Sintering
  • Bismuth molybdate catalyst
  • Catalytic performance
  • Hydrothermally synthesized
  • Plate-like morphology
  • Propylene oxidation

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