Au/PO43-/TiO2 and PO43-/Au/TiO2 catalysts for CO oxidation: Effect of synthesis details on catalytic performance

Zhen Ma; Suree Brown; Steven H. Overbury; Sheng Dai

doi:10.1016/j.apcata.2007.05.019

Au/PO₄^3-/TiO₂ and PO₄^3-/Au/TiO₂ catalysts for CO oxidation: Effect of synthesis details on catalytic performance

Zhen Ma, Suree Brown, Steven H. Overbury, Sheng Dai

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

54 Scopus citations

Abstract

Supported gold catalysts are active for CO oxidation, but the high-temperature deactivation is a shortcoming that may constrain their applications. Herein, we attempted to address this problem by using phosphate-doped Au/TiO₂ synthesized via two routes. In route I, Au/PO₄^3-/TiO₂ catalysts were prepared by treating TiO₂ (Degussa P25) with diluted H₃PO₄, followed by loading gold via deposition-precipitation. In route II, PO₄^3-/Au/TiO₂ catalysts were prepared by treating H₂-reduced Au/TiO₂ with diluted H₃PO₄. These catalysts were systematically pretreated at 200 or 500 °C before reaction testing. The overall CO conversion on 200 °C-pretreated Au/PO₄^3-/TiO₂ or PO₄^3-/Au/TiO₂ was always lower than that on 200 °C-pretreated Au/TiO₂. However, the advantage of the phosphate addition became apparent after thermal treatment at a higher temperature. Both Au/PO₄^3-/TiO₂ and PO₄^3-/Au/TiO₂ pretreated at 500 °C retained significant activities at room temperature, whereas 500 °C-pretreated Au/TiO₂ lost its activity. Control experiments and catalyst characterization were performed to investigate the impact of synthesis details on catalytic performance.

Original language	English
Pages (from-to)	226-237
Number of pages	12
Journal	Applied Catalysis A: General
Volume	327
Issue number	2
DOIs	https://doi.org/10.1016/j.apcata.2007.05.019
State	Published - Aug 15 2007

Funding

This work was supported by the Office of Basic Energy Sciences, U.S. Department of Energy. The Oak Ridge National Laboratory is managed by UT-Battelle, LLC for the U.S. DOE under Contract DE-AC05-00OR22725. This research was supported in part by the appointment for Z. Ma to the ORNL Research Associates Program, administered jointly by ORNL and the Oak Ridge Associated Universities. Helpful assistance from Dr. H.G. Zhu is appreciated. Insightful comments of anonymous reviewers are greatly appreciated.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
Basic Energy Sciences
Oak Ridge Associated Universities
Oak Ridge National Laboratory

Keywords

CO oxidation
Deactivation
Dopant
Gold catalysis
Phosphate
Sintering
Titania

Access to Document

10.1016/j.apcata.2007.05.019

Cite this

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title = "Au/PO43-/TiO2 and PO43-/Au/TiO2 catalysts for CO oxidation: Effect of synthesis details on catalytic performance",

abstract = "Supported gold catalysts are active for CO oxidation, but the high-temperature deactivation is a shortcoming that may constrain their applications. Herein, we attempted to address this problem by using phosphate-doped Au/TiO2 synthesized via two routes. In route I, Au/PO43-/TiO2 catalysts were prepared by treating TiO2 (Degussa P25) with diluted H3PO4, followed by loading gold via deposition-precipitation. In route II, PO43-/Au/TiO2 catalysts were prepared by treating H2-reduced Au/TiO2 with diluted H3PO4. These catalysts were systematically pretreated at 200 or 500 °C before reaction testing. The overall CO conversion on 200 °C-pretreated Au/PO43-/TiO2 or PO43-/Au/TiO2 was always lower than that on 200 °C-pretreated Au/TiO2. However, the advantage of the phosphate addition became apparent after thermal treatment at a higher temperature. Both Au/PO43-/TiO2 and PO43-/Au/TiO2 pretreated at 500 °C retained significant activities at room temperature, whereas 500 °C-pretreated Au/TiO2 lost its activity. Control experiments and catalyst characterization were performed to investigate the impact of synthesis details on catalytic performance.",

keywords = "CO oxidation, Deactivation, Dopant, Gold catalysis, Phosphate, Sintering, Titania",

author = "Zhen Ma and Suree Brown and Overbury, {Steven H.} and Sheng Dai",

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T2 - Effect of synthesis details on catalytic performance

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AU - Brown, Suree

AU - Overbury, Steven H.

AU - Dai, Sheng

PY - 2007/8/15

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N2 - Supported gold catalysts are active for CO oxidation, but the high-temperature deactivation is a shortcoming that may constrain their applications. Herein, we attempted to address this problem by using phosphate-doped Au/TiO2 synthesized via two routes. In route I, Au/PO43-/TiO2 catalysts were prepared by treating TiO2 (Degussa P25) with diluted H3PO4, followed by loading gold via deposition-precipitation. In route II, PO43-/Au/TiO2 catalysts were prepared by treating H2-reduced Au/TiO2 with diluted H3PO4. These catalysts were systematically pretreated at 200 or 500 °C before reaction testing. The overall CO conversion on 200 °C-pretreated Au/PO43-/TiO2 or PO43-/Au/TiO2 was always lower than that on 200 °C-pretreated Au/TiO2. However, the advantage of the phosphate addition became apparent after thermal treatment at a higher temperature. Both Au/PO43-/TiO2 and PO43-/Au/TiO2 pretreated at 500 °C retained significant activities at room temperature, whereas 500 °C-pretreated Au/TiO2 lost its activity. Control experiments and catalyst characterization were performed to investigate the impact of synthesis details on catalytic performance.

AB - Supported gold catalysts are active for CO oxidation, but the high-temperature deactivation is a shortcoming that may constrain their applications. Herein, we attempted to address this problem by using phosphate-doped Au/TiO2 synthesized via two routes. In route I, Au/PO43-/TiO2 catalysts were prepared by treating TiO2 (Degussa P25) with diluted H3PO4, followed by loading gold via deposition-precipitation. In route II, PO43-/Au/TiO2 catalysts were prepared by treating H2-reduced Au/TiO2 with diluted H3PO4. These catalysts were systematically pretreated at 200 or 500 °C before reaction testing. The overall CO conversion on 200 °C-pretreated Au/PO43-/TiO2 or PO43-/Au/TiO2 was always lower than that on 200 °C-pretreated Au/TiO2. However, the advantage of the phosphate addition became apparent after thermal treatment at a higher temperature. Both Au/PO43-/TiO2 and PO43-/Au/TiO2 pretreated at 500 °C retained significant activities at room temperature, whereas 500 °C-pretreated Au/TiO2 lost its activity. Control experiments and catalyst characterization were performed to investigate the impact of synthesis details on catalytic performance.

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