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H2 reduction of surface oxides on Pd-based membrane model systems -- The case of Pd(1 0 0) and Pd75Ag25(1 0 0).

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Title: H2 reduction of surface oxides on Pd-based membrane model systems -- The case of Pd(1 0 0) and Pd75Ag25(1 0 0).
Authors: Fernandes, V. R.1, Gustafson, J.2, Farstad, M. H.1, Walle, L. E.1, Blomberg, S.2, Lundgren, E.2, Venvik, H. J.3, Borg, A.1 anne.borg@ntnu.no
Source: Applied Surface Science. Sep2014, Vol. 313, p794-803. 10p.
Subjects: Palladium compounds, Hydrogen, Chemical reduction, Surface chemistry, Artificial membranes, Photoelectron spectroscopy
Abstract: Reduction of the (√5 x √5)R27° surface oxide on Pd(1 0 0) and Pd75Ag25(1 0 0) surfaces by H2 has been studied using high-resolution photoelectron spectroscopy in situ at H2 pressures 5 x 10-9 mbar and 5 x 10-8 mbar and selected temperatures in the range 30 °C to 170 °C. The reduction is slower on Pd75Ag25(1 0 0) compared to Pd(1 0 0) for all temperatures and pressures investigated. For Pd(1 0 0), the surface oxide reduction rate is rather independent of temperature, while for Pd75Ag25(1 0 0) a non-monotonic variation is observed. As indicated by kinetic analysis, the complex reduction behavior is not well described by Avrami kinetics. Oxygen spillover effects contribute to this picture for Pd(1 0 0), while surface compositional effects appear to dominate the performance for Pd75Ag25(1 0 0). These findings may have implications for understanding the oxidation, reduction and hydrogen transport properties of Pd-Ag membranes. [ABSTRACT FROM AUTHOR]
Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 97184479
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: H<subscript>2</subscript> reduction of surface oxides on Pd-based membrane model systems -- The case of Pd(1 0 0) and Pd<subscript>75</subscript>Ag<subscript>25</subscript>(1 0 0).
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  Data: <searchLink fieldCode="AR" term="%22Fernandes%2C+V%2E+R%2E%22">Fernandes, V. R.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gustafson%2C+J%2E%22">Gustafson, J.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Farstad%2C+M%2E+H%2E%22">Farstad, M. H.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Walle%2C+L%2E+E%2E%22">Walle, L. E.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Blomberg%2C+S%2E%22">Blomberg, S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lundgren%2C+E%2E%22">Lundgren, E.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Venvik%2C+H%2E+J%2E%22">Venvik, H. J.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Borg%2C+A%2E%22">Borg, A.</searchLink><relatesTo>1</relatesTo><i> anne.borg@ntnu.no</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Surface+Science%22">Applied Surface Science</searchLink>. Sep2014, Vol. 313, p794-803. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Palladium+compounds%22">Palladium compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen%22">Hydrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reduction%22">Chemical reduction</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+chemistry%22">Surface chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Artificial+membranes%22">Artificial membranes</searchLink><br /><searchLink fieldCode="DE" term="%22Photoelectron+spectroscopy%22">Photoelectron spectroscopy</searchLink>
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  Data: Reduction of the (√5 x √5)R27° surface oxide on Pd(1 0 0) and Pd75Ag25(1 0 0) surfaces by H2 has been studied using high-resolution photoelectron spectroscopy in situ at H2 pressures 5 x 10-9 mbar and 5 x 10-8 mbar and selected temperatures in the range 30 °C to 170 °C. The reduction is slower on Pd75Ag25(1 0 0) compared to Pd(1 0 0) for all temperatures and pressures investigated. For Pd(1 0 0), the surface oxide reduction rate is rather independent of temperature, while for Pd75Ag25(1 0 0) a non-monotonic variation is observed. As indicated by kinetic analysis, the complex reduction behavior is not well described by Avrami kinetics. Oxygen spillover effects contribute to this picture for Pd(1 0 0), while surface compositional effects appear to dominate the performance for Pd75Ag25(1 0 0). These findings may have implications for understanding the oxidation, reduction and hydrogen transport properties of Pd-Ag membranes. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Applied Surface Science is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.apsusc.2014.06.077
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      – Code: eng
        Text: English
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        PageCount: 10
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    Subjects:
      – SubjectFull: Palladium compounds
        Type: general
      – SubjectFull: Hydrogen
        Type: general
      – SubjectFull: Chemical reduction
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      – SubjectFull: Surface chemistry
        Type: general
      – SubjectFull: Artificial membranes
        Type: general
      – SubjectFull: Photoelectron spectroscopy
        Type: general
    Titles:
      – TitleFull: H2 reduction of surface oxides on Pd-based membrane model systems -- The case of Pd(1 0 0) and Pd75Ag25(1 0 0).
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              M: 09
              Text: Sep2014
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