Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene

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

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Abstract

A variety of morphologically different α-MoO3 samples were prepared by hydrothermal synthesis and applied in the selective oxidation of propylene. Their catalytic performance was compared to α-MoO3 prepared by flame spray pyrolysis (FSP) and a classical synthesis route. Hydrothermal synthesis from ammonium heptamolybdate (AHM) and nitric acid at pH 1-2 led to ammonium containing molybdenum oxide phases that were completely transformed into α-MoO3 after calcination at 550 °C. A one-step synthesis of α-MoO3 rods was possible starting from MoO3·2H2O with acetic acid or nitric acid and from AHM with nitric acid at 180°C. Particularly, if nitric acid was used during synthesis, the rod-like morphology of the samples could be stabilized during calcination at 550°C and the following catalytic activity tests, which was beneficial for the catalytic performance in propylene oxidation. Characterization studies using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy showed that those samples, which retained their rod-like morphology during the activity tests, yielded the highest propylene conversion.
Original languageEnglish
JournalJournal of Solid State Chemistry
Volume228
Pages (from-to)42-52
Number of pages11
ISSN0022-4596
DOIs
Publication statusPublished - 2015

Keywords

  • Propylene oxidation
  • Molybdenum oxides
  • Morphology
  • Hydrothermal synthesis
  • Structure sensitivity

Cite this

Schuh, Kirsten ; Kleist, Wolfgang ; Høj, Martin ; Jensen, Anker Degn ; Beato, Pablo ; Patzke, Greta R. ; Grunwaldt, Jan-Dierk. / Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene. In: Journal of Solid State Chemistry. 2015 ; Vol. 228. pp. 42-52.
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title = "Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene",
abstract = "A variety of morphologically different α-MoO3 samples were prepared by hydrothermal synthesis and applied in the selective oxidation of propylene. Their catalytic performance was compared to α-MoO3 prepared by flame spray pyrolysis (FSP) and a classical synthesis route. Hydrothermal synthesis from ammonium heptamolybdate (AHM) and nitric acid at pH 1-2 led to ammonium containing molybdenum oxide phases that were completely transformed into α-MoO3 after calcination at 550 °C. A one-step synthesis of α-MoO3 rods was possible starting from MoO3·2H2O with acetic acid or nitric acid and from AHM with nitric acid at 180°C. Particularly, if nitric acid was used during synthesis, the rod-like morphology of the samples could be stabilized during calcination at 550°C and the following catalytic activity tests, which was beneficial for the catalytic performance in propylene oxidation. Characterization studies using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy showed that those samples, which retained their rod-like morphology during the activity tests, yielded the highest propylene conversion.",
keywords = "Propylene oxidation, Molybdenum oxides, Morphology, Hydrothermal synthesis, Structure sensitivity",
author = "Kirsten Schuh and Wolfgang Kleist and Martin H{\o}j and Jensen, {Anker Degn} and Pablo Beato and Patzke, {Greta R.} and Jan-Dierk Grunwaldt",
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language = "English",
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Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene. / Schuh, Kirsten; Kleist, Wolfgang; Høj, Martin; Jensen, Anker Degn; Beato, Pablo; Patzke, Greta R.; Grunwaldt, Jan-Dierk.

In: Journal of Solid State Chemistry, Vol. 228, 2015, p. 42-52.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Systematic study on the influence of the morphology of α-MoO3 in the selective oxidation of propylene

AU - Schuh, Kirsten

AU - Kleist, Wolfgang

AU - Høj, Martin

AU - Jensen, Anker Degn

AU - Beato, Pablo

AU - Patzke, Greta R.

AU - Grunwaldt, Jan-Dierk

PY - 2015

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N2 - A variety of morphologically different α-MoO3 samples were prepared by hydrothermal synthesis and applied in the selective oxidation of propylene. Their catalytic performance was compared to α-MoO3 prepared by flame spray pyrolysis (FSP) and a classical synthesis route. Hydrothermal synthesis from ammonium heptamolybdate (AHM) and nitric acid at pH 1-2 led to ammonium containing molybdenum oxide phases that were completely transformed into α-MoO3 after calcination at 550 °C. A one-step synthesis of α-MoO3 rods was possible starting from MoO3·2H2O with acetic acid or nitric acid and from AHM with nitric acid at 180°C. Particularly, if nitric acid was used during synthesis, the rod-like morphology of the samples could be stabilized during calcination at 550°C and the following catalytic activity tests, which was beneficial for the catalytic performance in propylene oxidation. Characterization studies using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy showed that those samples, which retained their rod-like morphology during the activity tests, yielded the highest propylene conversion.

AB - A variety of morphologically different α-MoO3 samples were prepared by hydrothermal synthesis and applied in the selective oxidation of propylene. Their catalytic performance was compared to α-MoO3 prepared by flame spray pyrolysis (FSP) and a classical synthesis route. Hydrothermal synthesis from ammonium heptamolybdate (AHM) and nitric acid at pH 1-2 led to ammonium containing molybdenum oxide phases that were completely transformed into α-MoO3 after calcination at 550 °C. A one-step synthesis of α-MoO3 rods was possible starting from MoO3·2H2O with acetic acid or nitric acid and from AHM with nitric acid at 180°C. Particularly, if nitric acid was used during synthesis, the rod-like morphology of the samples could be stabilized during calcination at 550°C and the following catalytic activity tests, which was beneficial for the catalytic performance in propylene oxidation. Characterization studies using X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy showed that those samples, which retained their rod-like morphology during the activity tests, yielded the highest propylene conversion.

KW - Propylene oxidation

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KW - Hydrothermal synthesis

KW - Structure sensitivity

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