A Study of Support Effects for CH4 and CO Oxidation over Pd Catalysts on ALD-Modified Al2O3
Abstract
Interactions between a metal and its oxide support can influence CO and CH4 oxidation, but promotion by the support can be difficult to study because oxides can have different surface structures and surface areas. To focus on the chemical aspects of support promotion for CO and CH4 oxidation, this study investigated the effect of support composition on Pd catalysts by preparing uniform films of NiO, Co3O4, Fe2O3, MnO2, CeO2, and ZrO2 on γ-Al2O3 using Atomic Layer Deposition (ALD). The structure of the films was characterized by XRD and STEM, and catalysts with ~ 1-wt% Pd were examined for CO and CH4 oxidation. CeO2/γ-Al2O3 was unique among the supports in greatly stabilizing the Pd dispersion to 1173 K. Rates for CO oxidation were enhanced by the presence of CeO2, Fe2O3, and MnO2, while the other oxides had no promotional effect. For CH4 oxidation, only NiO and Co3O4 were modest promoters, while the other reducible oxides even showed a negative effect on rates. Finally, possible reasons for the differences between CH4 and CO oxidation activities are discussed.
- Authors:
-
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Publication Date:
- Research Org.:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1593991
- Grant/Contract Number:
- FG02-13ER16380; SC0009440
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Catalysis Letters
- Additional Journal Information:
- Journal Volume: 149; Journal Issue: 4; Journal ID: ISSN 1011-372X
- Publisher:
- Springer
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Methane Oxidation; CO Oxidation; Palladium; Support Effects; Atomic Layer Deposition
Citation Formats
Mao, Xinyu, Foucher, Alexandre, Stach, Eric A., and Gorte, Raymond J. A Study of Support Effects for CH4 and CO Oxidation over Pd Catalysts on ALD-Modified Al2O3. United States: N. p., 2019.
Web. doi:10.1007/s10562-019-02699-6.
Mao, Xinyu, Foucher, Alexandre, Stach, Eric A., & Gorte, Raymond J. A Study of Support Effects for CH4 and CO Oxidation over Pd Catalysts on ALD-Modified Al2O3. United States. https://doi.org/10.1007/s10562-019-02699-6
Mao, Xinyu, Foucher, Alexandre, Stach, Eric A., and Gorte, Raymond J. Fri .
"A Study of Support Effects for CH4 and CO Oxidation over Pd Catalysts on ALD-Modified Al2O3". United States. https://doi.org/10.1007/s10562-019-02699-6. https://www.osti.gov/servlets/purl/1593991.
@article{osti_1593991,
title = {A Study of Support Effects for CH4 and CO Oxidation over Pd Catalysts on ALD-Modified Al2O3},
author = {Mao, Xinyu and Foucher, Alexandre and Stach, Eric A. and Gorte, Raymond J.},
abstractNote = {Interactions between a metal and its oxide support can influence CO and CH4 oxidation, but promotion by the support can be difficult to study because oxides can have different surface structures and surface areas. To focus on the chemical aspects of support promotion for CO and CH4 oxidation, this study investigated the effect of support composition on Pd catalysts by preparing uniform films of NiO, Co3O4, Fe2O3, MnO2, CeO2, and ZrO2 on γ-Al2O3 using Atomic Layer Deposition (ALD). The structure of the films was characterized by XRD and STEM, and catalysts with ~ 1-wt% Pd were examined for CO and CH4 oxidation. CeO2/γ-Al2O3 was unique among the supports in greatly stabilizing the Pd dispersion to 1173 K. Rates for CO oxidation were enhanced by the presence of CeO2, Fe2O3, and MnO2, while the other oxides had no promotional effect. For CH4 oxidation, only NiO and Co3O4 were modest promoters, while the other reducible oxides even showed a negative effect on rates. Finally, possible reasons for the differences between CH4 and CO oxidation activities are discussed.},
doi = {10.1007/s10562-019-02699-6},
journal = {Catalysis Letters},
number = 4,
volume = 149,
place = {United States},
year = {Fri Feb 08 00:00:00 EST 2019},
month = {Fri Feb 08 00:00:00 EST 2019}
}
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