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1 Department of Chemical and Biochemical Engineering, Technical University of Denmark 2 CHEC Research Centre, Department of Chemical and Biochemical Engineering, Technical University of Denmark 3 Karlsruhe Institute of Technology 4 Haldor Topsoe AS 5 University of Zurich 6 Haldor Topsoe AS
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.
Applied Catalysis A: General, 2014, Vol 482, p. 145-156
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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