Transient studies on the role of oxygen activation in the partial oxidation of methane over ZrO2-based catalysts

J. J. Zhu; J. G. Van Ommen; L. Lefferts

Transient studies on the role of oxygen activation in the partial oxidation of methane over ZrO2-based catalysts

J. J. Zhu, J. G. Van Ommen, L. Lefferts^*

^*Corresponding author for this work

Catalytic Processes and Materials

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Abstract

CPOM over ZrO₂-based oxide catalysts was studied by transient experiments. The oxidation products, i.e., CO, CO₂, H₂O, and H₂, did not contain any 18O, after pulsing a mixture of CH₄ and 18O2 (2:1) over YSZ catalysts at 500°-900°C. Thus, CH₄ was oxidized by lattice oxygen of the catalysts. The consumed oxygen was restored by gas phase oxygen via oxygen exchange with the oxide. Interaction between gas phase oxygen and intrinsic oxygen vacancies in ZrO₂ and oxygen vacancies generated by doping Y₂O₃ in ZrO₂ was discussed. Catalytic performance was very sensitive to segregation of extremely low-level contaminations like earth alkali oxides. The effect of traces of contaminations on the catalytic performance was also elucidated. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

Original language	English
Pages (from-to)	COLL-60
Journal	Abstracts of papers of the American Chemical Society
Volume	228
Issue number	1
Publication status	Published - 2004
Event	228th American Chemical Society National Meeting (ACS): 228th ACS National Meeting - Philadelphia, U.S.A. Duration: 25 Aug 2004 → 27 Aug 2004

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@article{5671b74cae3b48a9be087efdc61b9270,

title = "Transient studies on the role of oxygen activation in the partial oxidation of methane over ZrO2-based catalysts",

abstract = "CPOM over ZrO2-based oxide catalysts was studied by transient experiments. The oxidation products, i.e., CO, CO2, H2O, and H2, did not contain any 18O, after pulsing a mixture of CH4 and 18O2 (2:1) over YSZ catalysts at 500°-900°C. Thus, CH4 was oxidized by lattice oxygen of the catalysts. The consumed oxygen was restored by gas phase oxygen via oxygen exchange with the oxide. Interaction between gas phase oxygen and intrinsic oxygen vacancies in ZrO2 and oxygen vacancies generated by doping Y2O3 in ZrO2 was discussed. Catalytic performance was very sensitive to segregation of extremely low-level contaminations like earth alkali oxides. The effect of traces of contaminations on the catalytic performance was also elucidated. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).",

author = "Zhu, {J. J.} and {Van Ommen}, {J. G.} and L. Lefferts",

year = "2004",

language = "English",

volume = "228",

pages = "COLL--60",

journal = "Abstracts of papers of the American Chemical Society",

issn = "0065-7727",

publisher = "American Chemical Society",

number = "1",

note = "228th American Chemical Society National Meeting (ACS) : 228th ACS National Meeting ; Conference date: 25-08-2004 Through 27-08-2004",

}

TY - JOUR

T1 - Transient studies on the role of oxygen activation in the partial oxidation of methane over ZrO2-based catalysts

AU - Zhu, J. J.

AU - Van Ommen, J. G.

AU - Lefferts, L.

PY - 2004

Y1 - 2004

N2 - CPOM over ZrO2-based oxide catalysts was studied by transient experiments. The oxidation products, i.e., CO, CO2, H2O, and H2, did not contain any 18O, after pulsing a mixture of CH4 and 18O2 (2:1) over YSZ catalysts at 500°-900°C. Thus, CH4 was oxidized by lattice oxygen of the catalysts. The consumed oxygen was restored by gas phase oxygen via oxygen exchange with the oxide. Interaction between gas phase oxygen and intrinsic oxygen vacancies in ZrO2 and oxygen vacancies generated by doping Y2O3 in ZrO2 was discussed. Catalytic performance was very sensitive to segregation of extremely low-level contaminations like earth alkali oxides. The effect of traces of contaminations on the catalytic performance was also elucidated. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

AB - CPOM over ZrO2-based oxide catalysts was studied by transient experiments. The oxidation products, i.e., CO, CO2, H2O, and H2, did not contain any 18O, after pulsing a mixture of CH4 and 18O2 (2:1) over YSZ catalysts at 500°-900°C. Thus, CH4 was oxidized by lattice oxygen of the catalysts. The consumed oxygen was restored by gas phase oxygen via oxygen exchange with the oxide. Interaction between gas phase oxygen and intrinsic oxygen vacancies in ZrO2 and oxygen vacancies generated by doping Y2O3 in ZrO2 was discussed. Catalytic performance was very sensitive to segregation of extremely low-level contaminations like earth alkali oxides. The effect of traces of contaminations on the catalytic performance was also elucidated. This is an abstract of a paper presented at the 228th ACS National Meeting (Philadelphia, PA 8/22-26/2004).

UR - http://www.scopus.com/inward/record.url?scp=5044244232&partnerID=8YFLogxK

M3 - Meeting Abstract

AN - SCOPUS:5044244232

SN - 0065-7727

VL - 228

SP - COLL-60

JO - Abstracts of papers of the American Chemical Society

JF - Abstracts of papers of the American Chemical Society

IS - 1

T2 - 228th American Chemical Society National Meeting (ACS)

Y2 - 25 August 2004 through 27 August 2004

ER -

Transient studies on the role of oxygen activation in the partial oxidation of methane over ZrO2-based catalysts

Abstract

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