Oxidation state of platinum clusters during the reduction of NOx with propene and propane

Walter Schießer; Hannelore Vinek; Andreas Jentys

doi:10.1023/A:1009069214821

Oxidation state of platinum clusters during the reduction of NO_x with propene and propane

Walter Schießer, Hannelore Vinek, Andreas Jentys

Chair of Industrial Chemistry and heterogeneous Catalysis

Technical University of Vienna

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The oxidation state of platinum supported on mesoporous SiCO₂ and Al₂O₃ with MCM-41 type structure during the reduction of NO_x with propene or propane was investigated using in situ X-ray absorption spectroscopy. Platinum supported on MCM-41 (SiO₂) was reduced at low and oxidized at high reaction temperatures when propene was used as reducing agent, while it was found to be always oxidized in Pt/MCM-41 (Al₂O₃). When propane was used as reducing agent significant NO conversion was not observed over Pt/MCM-41 (SiO₂) and on both supports platinum was in an oxidized state. At the successive adsorption of the reactants, the prereduced catalysts were oxidized after NO adsorption and reduced after addition of the hydrocarbons. Addition of oxygen re-oxidized the catalysts, while the presence of water vapor did not influence the oxidation state.

Original language	English
Pages (from-to)	67-72
Number of pages	6
Journal	Catalysis Letters
Volume	73
Issue number	1
DOIs	https://doi.org/10.1023/A:1009069214821
State	Published - Apr 2001

Keywords

In situ XANES
Oxidation state
Pt/MCM-41
deNO

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title = "Oxidation state of platinum clusters during the reduction of NOx with propene and propane",

abstract = "The oxidation state of platinum supported on mesoporous SiCO2 and Al2O3 with MCM-41 type structure during the reduction of NOx with propene or propane was investigated using in situ X-ray absorption spectroscopy. Platinum supported on MCM-41 (SiO2) was reduced at low and oxidized at high reaction temperatures when propene was used as reducing agent, while it was found to be always oxidized in Pt/MCM-41 (Al2O3). When propane was used as reducing agent significant NO conversion was not observed over Pt/MCM-41 (SiO2) and on both supports platinum was in an oxidized state. At the successive adsorption of the reactants, the prereduced catalysts were oxidized after NO adsorption and reduced after addition of the hydrocarbons. Addition of oxygen re-oxidized the catalysts, while the presence of water vapor did not influence the oxidation state.",

keywords = "In situ XANES, Oxidation state, Pt/MCM-41, deNO",

author = "Walter Schie{\ss}er and Hannelore Vinek and Andreas Jentys",

note = "Funding Information: We would like to thank the HASYLAB (Hamburger Syn-chrotronstrahlungslabor, Hamburg, Germany) for the provision of synchrotron radiation under the project no. I-98-038EC. The work was supported by the {\"O}sterreichische Na-tionalbank under project 7119.",

year = "2001",

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doi = "10.1023/A:1009069214821",

language = "English",

volume = "73",

pages = "67--72",

journal = "Catalysis Letters",

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T1 - Oxidation state of platinum clusters during the reduction of NOx with propene and propane

AU - Schießer, Walter

AU - Vinek, Hannelore

AU - Jentys, Andreas

N1 - Funding Information: We would like to thank the HASYLAB (Hamburger Syn-chrotronstrahlungslabor, Hamburg, Germany) for the provision of synchrotron radiation under the project no. I-98-038EC. The work was supported by the Österreichische Na-tionalbank under project 7119.

PY - 2001/4

Y1 - 2001/4

N2 - The oxidation state of platinum supported on mesoporous SiCO2 and Al2O3 with MCM-41 type structure during the reduction of NOx with propene or propane was investigated using in situ X-ray absorption spectroscopy. Platinum supported on MCM-41 (SiO2) was reduced at low and oxidized at high reaction temperatures when propene was used as reducing agent, while it was found to be always oxidized in Pt/MCM-41 (Al2O3). When propane was used as reducing agent significant NO conversion was not observed over Pt/MCM-41 (SiO2) and on both supports platinum was in an oxidized state. At the successive adsorption of the reactants, the prereduced catalysts were oxidized after NO adsorption and reduced after addition of the hydrocarbons. Addition of oxygen re-oxidized the catalysts, while the presence of water vapor did not influence the oxidation state.

AB - The oxidation state of platinum supported on mesoporous SiCO2 and Al2O3 with MCM-41 type structure during the reduction of NOx with propene or propane was investigated using in situ X-ray absorption spectroscopy. Platinum supported on MCM-41 (SiO2) was reduced at low and oxidized at high reaction temperatures when propene was used as reducing agent, while it was found to be always oxidized in Pt/MCM-41 (Al2O3). When propane was used as reducing agent significant NO conversion was not observed over Pt/MCM-41 (SiO2) and on both supports platinum was in an oxidized state. At the successive adsorption of the reactants, the prereduced catalysts were oxidized after NO adsorption and reduced after addition of the hydrocarbons. Addition of oxygen re-oxidized the catalysts, while the presence of water vapor did not influence the oxidation state.

KW - In situ XANES

KW - Oxidation state

KW - Pt/MCM-41

KW - deNO

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DO - 10.1023/A:1009069214821

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SN - 1011-372X

VL - 73

SP - 67

EP - 72

JO - Catalysis Letters

JF - Catalysis Letters

IS - 1

ER -

Oxidation state of platinum clusters during the reduction of NO_x with propene and propane

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Keywords

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