Effect of additives on Pd/Al2O3 for CO and propylene oxidation at oxygen-deficient conditions

Chiou Hwang Lee; Yu Wen Chen

doi:10.1016/S0926-3373(97)00072-6

Effect of additives on Pd/Al₂O₃ for CO and propylene oxidation at oxygen-deficient conditions

Chiou Hwang Lee, Yu Wen Chen

Department of Chemical and Materials Engineering

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

19 Scopus citations

Abstract

The effects of additives, CeO₂ and K₂O, on Pd/Al₂O₃ for CO and C₃H₆ oxidation under oxygen-deficient conditions were investigated. The unpromoted Pd/Al₂O₃ exhibits the highest C₃H₆ conversion among the Pd catalysts, but its CO conversion is very low and even negative at the higher temperature (> 500°C). Nevertheless, the CO conversion on Pd/Al₂O₃ can be significantly promoted by the addition of CeO₂ and K₂O. When water participates in the reaction, the CO conversions on the promoted Pd/Al₂O₃ catalysts can be further increased. The promotional extent of CO conversion on the Pd catalysts is in the order: Pd-K₂O-CeO₂/Al₂O₃ > Pd-K₂O/Al₂O₃ > Pd-CeO₂/Al₂O₃ > Pd/Al₂O₃. Moreover, Pd-K₂O-CeO₂/Al₂O₃ exhibits the highest CO conversion among the Pd catalysts. In addition, the test results of the monolithic catalysts also reveal that the CO conversion on PdRh/K₂O/Al₂O₃-CeO₂ is quite close to that on PtRh/Al₂O₃-CeO₂ under the simulative gases and the ECE-40 mode driving cycle test. However, PdRh/K₂O/Al₂O₃-CeO₂ exhibits lower HC conversion due to the lower activity for alkane oxidation.

Original language	English
Pages (from-to)	279-291
Number of pages	13
Journal	Applied Catalysis B: Environmental
Volume	17
Issue number	4
DOIs	https://doi.org/10.1016/S0926-3373(97)00072-6
State	Published - 31 Aug 1998

Keywords

Additive
Oxygen-deficient
Palladium
Two-stroke motorcycle
Water gas-shift

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10.1016/S0926-3373(97)00072-6

Cite this

@article{3766cff6c4b947afa0e18902f025527a,

title = "Effect of additives on Pd/Al2O3 for CO and propylene oxidation at oxygen-deficient conditions",

abstract = "The effects of additives, CeO2 and K2O, on Pd/Al2O3 for CO and C3H6 oxidation under oxygen-deficient conditions were investigated. The unpromoted Pd/Al2O3 exhibits the highest C3H6 conversion among the Pd catalysts, but its CO conversion is very low and even negative at the higher temperature (> 500°C). Nevertheless, the CO conversion on Pd/Al2O3 can be significantly promoted by the addition of CeO2 and K2O. When water participates in the reaction, the CO conversions on the promoted Pd/Al2O3 catalysts can be further increased. The promotional extent of CO conversion on the Pd catalysts is in the order: Pd-K2O-CeO2/Al2O3 > Pd-K2O/Al2O3 > Pd-CeO2/Al2O3 > Pd/Al2O3. Moreover, Pd-K2O-CeO2/Al2O3 exhibits the highest CO conversion among the Pd catalysts. In addition, the test results of the monolithic catalysts also reveal that the CO conversion on PdRh/K2O/Al2O3-CeO2 is quite close to that on PtRh/Al2O3-CeO2 under the simulative gases and the ECE-40 mode driving cycle test. However, PdRh/K2O/Al2O3-CeO2 exhibits lower HC conversion due to the lower activity for alkane oxidation.",

keywords = "Additive, Oxygen-deficient, Palladium, Two-stroke motorcycle, Water gas-shift",

author = "Lee, {Chiou Hwang} and Chen, {Yu Wen}",

note = "Funding Information: The authors would like to thank the National Science Council for financially supporting this work under Contract No. NSC-85-2214-E008-012.",

year = "1998",

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T1 - Effect of additives on Pd/Al2O3 for CO and propylene oxidation at oxygen-deficient conditions

AU - Lee, Chiou Hwang

AU - Chen, Yu Wen

N1 - Funding Information: The authors would like to thank the National Science Council for financially supporting this work under Contract No. NSC-85-2214-E008-012.

PY - 1998/8/31

Y1 - 1998/8/31

N2 - The effects of additives, CeO2 and K2O, on Pd/Al2O3 for CO and C3H6 oxidation under oxygen-deficient conditions were investigated. The unpromoted Pd/Al2O3 exhibits the highest C3H6 conversion among the Pd catalysts, but its CO conversion is very low and even negative at the higher temperature (> 500°C). Nevertheless, the CO conversion on Pd/Al2O3 can be significantly promoted by the addition of CeO2 and K2O. When water participates in the reaction, the CO conversions on the promoted Pd/Al2O3 catalysts can be further increased. The promotional extent of CO conversion on the Pd catalysts is in the order: Pd-K2O-CeO2/Al2O3 > Pd-K2O/Al2O3 > Pd-CeO2/Al2O3 > Pd/Al2O3. Moreover, Pd-K2O-CeO2/Al2O3 exhibits the highest CO conversion among the Pd catalysts. In addition, the test results of the monolithic catalysts also reveal that the CO conversion on PdRh/K2O/Al2O3-CeO2 is quite close to that on PtRh/Al2O3-CeO2 under the simulative gases and the ECE-40 mode driving cycle test. However, PdRh/K2O/Al2O3-CeO2 exhibits lower HC conversion due to the lower activity for alkane oxidation.

AB - The effects of additives, CeO2 and K2O, on Pd/Al2O3 for CO and C3H6 oxidation under oxygen-deficient conditions were investigated. The unpromoted Pd/Al2O3 exhibits the highest C3H6 conversion among the Pd catalysts, but its CO conversion is very low and even negative at the higher temperature (> 500°C). Nevertheless, the CO conversion on Pd/Al2O3 can be significantly promoted by the addition of CeO2 and K2O. When water participates in the reaction, the CO conversions on the promoted Pd/Al2O3 catalysts can be further increased. The promotional extent of CO conversion on the Pd catalysts is in the order: Pd-K2O-CeO2/Al2O3 > Pd-K2O/Al2O3 > Pd-CeO2/Al2O3 > Pd/Al2O3. Moreover, Pd-K2O-CeO2/Al2O3 exhibits the highest CO conversion among the Pd catalysts. In addition, the test results of the monolithic catalysts also reveal that the CO conversion on PdRh/K2O/Al2O3-CeO2 is quite close to that on PtRh/Al2O3-CeO2 under the simulative gases and the ECE-40 mode driving cycle test. However, PdRh/K2O/Al2O3-CeO2 exhibits lower HC conversion due to the lower activity for alkane oxidation.

KW - Additive

KW - Oxygen-deficient

KW - Palladium

KW - Two-stroke motorcycle

KW - Water gas-shift

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DO - 10.1016/S0926-3373(97)00072-6

M3 - 期刊論文

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JO - Applied Catalysis B: Environmental

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