Near ambient pressure XPS investigation of hydrous palladium oxide under water and oxygen gas environments
Pd takes various chemical forms according to the types of catalysts and even its pristine chemical state is often subject to change in operation. To understand the mechanism how Pd-based catalysts activate reactions, it is important to have a capability to identify the surface chemical state of Pd-b...
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| Published in | Journal of physics. D, Applied physics Vol. 54; no. 32; pp. 324001 - 324007 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
IOP Publishing
12.08.2021
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| Subjects | |
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| Abstract | Pd takes various chemical forms according to the types of catalysts and even its pristine chemical state is often subject to change in operation. To understand the mechanism how Pd-based catalysts activate reactions, it is important to have a capability to identify the surface chemical state of Pd-based catalysts in contact with reactants. In this study, we conducted
in situ
near ambient pressure-x-ray photoelectron spectroscopy (NAP-XPS) in gas conditions with water and oxygen for hydrous Pd oxide, which is also known as palladium hydroxide (Pd(OH)
2
) and it is the key component of the Pearlman’s catalyst widely used for organic reactions. We found that hydrous Pd oxide showed different spectral features to that of anhydrous Pd oxide under gaseous water environments. We believe that this NAP-XPS study provides new information for a better identification of hydrous Pd oxide under reaction conditions, which is not available from conventional XPS in ultrahigh vacuum. |
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| AbstractList | Pd takes various chemical forms according to the types of catalysts and even its pristine chemical state is often subject to change in operation. To understand the mechanism how Pd-based catalysts activate reactions, it is important to have a capability to identify the surface chemical state of Pd-based catalysts in contact with reactants. In this study, we conducted
in situ
near ambient pressure-x-ray photoelectron spectroscopy (NAP-XPS) in gas conditions with water and oxygen for hydrous Pd oxide, which is also known as palladium hydroxide (Pd(OH)
2
) and it is the key component of the Pearlman’s catalyst widely used for organic reactions. We found that hydrous Pd oxide showed different spectral features to that of anhydrous Pd oxide under gaseous water environments. We believe that this NAP-XPS study provides new information for a better identification of hydrous Pd oxide under reaction conditions, which is not available from conventional XPS in ultrahigh vacuum. |
| Author | Lee, Dooyong Lee, Sang Moon Jeong, Beomgyun Park, Ji-In |
| Author_xml | – sequence: 1 givenname: Beomgyun orcidid: 0000-0003-3890-1464 surname: Jeong fullname: Jeong, Beomgyun organization: Korea Basic Science Institute (KBSI) Research Center for Materials Analysis, Daejeon 34133, Republic of Korea – sequence: 2 givenname: Dooyong surname: Lee fullname: Lee, Dooyong organization: University of Minnesota Department of Chemical Engineering and Materials Science, Minneapolis, MN 55455-0132, United States of America – sequence: 3 givenname: Ji-In surname: Park fullname: Park, Ji-In organization: Center for Research Equipment, KBSI , Daejeon 34133, Republic of Korea – sequence: 4 givenname: Sang Moon surname: Lee fullname: Lee, Sang Moon organization: Korea Basic Science Institute (KBSI) Research Center for Materials Analysis, Daejeon 34133, Republic of Korea |
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| Snippet | Pd takes various chemical forms according to the types of catalysts and even its pristine chemical state is often subject to change in operation. To understand... |
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| SubjectTerms | ambient pressure XPS hydrous oxide hydroxide palladium water |
| Title | Near ambient pressure XPS investigation of hydrous palladium oxide under water and oxygen gas environments |
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