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Journal Article

The Influence of Melting on Catalysis in Propane Oxidation

MPS-Authors
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Erdem,  Ezgi       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons32715

Tarasov,  Andrey
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21768

Kube,  Pierre       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons249470

Koch,  Gregor
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons200441

Plodinec,  Milivoj       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Lunkenbein,  Thomas       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons227633

Carey,  Spencer       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons213432

Wang,  Yuanqing       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons21590

Hävecker,  Michael       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22071

Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

/persons/resource/persons22181

Trunschke,  Annette       
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Erdem, E., Tarasov, A., Kube, P., Koch, G., Plodinec, M., Lunkenbein, T., et al. (2024). The Influence of Melting on Catalysis in Propane Oxidation. ChemCatChem, 16(3): e202301242. doi:10.1002/cctc.202301242.


Cite as: https://hdl.handle.net/21.11116/0000-000E-2748-6
Abstract
A model catalyst composed of crystalline potassium pentavanadate (K3V5O14) supported on silica was studied to elucidate the effect of phase transitions on the performance of potassium-promoted vanadia catalysts in propane oxidation. Operando calorimetry shows a clear correlation between an extinction of activity and increase in selectivity to propylene upon melting of the crystalline K3V5O14 phase, which itself is not active in the solid state. Importantly, the melt itself, i.e., the K3V5O14 phase in the liquid state, also has no oxidative effect. The measured activity mainly originates from highly-active, i.e., unselective VxOy surface species anchored to silica and formed during synthesis in addition to the supported pentavanadate phase. Melting of K3V5O14 leads to the coverage of these VxOy species preventing the overoxidation of propylene and leading to an increase in propylene selectivity. The change in catalyst properties is therefore due to a physical effect and not to a change in the chemical properties of the predominant crystalline phase.