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Selective oxidation of propylene to acrolein by hydrothermally synthesized bismuth molybdates

Paper ID Volume ID Publish Year Pages File Format Full-Text
39594 45828 2014 12 PDF Available
Title
Selective oxidation of propylene to acrolein by hydrothermally synthesized bismuth molybdates
Abstract

•Bismuth molybdates with plate-like morphology were prepared by hydrothermal synthesis.•Good catalytic activity and selectivity for propylene oxidation to acrolein.•Thermal treatment decreased the propylene conversion resulting in lower acrolein yield.•Addition of nitric acid or ammonia solution improved catalytic performance.•Hydrothermal synthesis led to more active or selective catalysts than co-precipitation.

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-Bi2Mo3O12. 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.

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Keywords
Bismuth molybdates; Hydrothermal synthesis; Unsupported catalysts; Selective propylene oxidation; Acrolein
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Selective oxidation of propylene to acrolein by hydrothermally synthesized bismuth molybdates
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 482, 22 July 2014, Pages 145–156
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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