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Competitive Adsorption of Nitrite and Hydrogen on Palladium during Nitrite Hydrogenation.

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Title: Competitive Adsorption of Nitrite and Hydrogen on Palladium during Nitrite Hydrogenation.
Authors: Postma, Rolf Sybren1, Brunet Espinosa, Roger1,2, Lefferts, Leon1 l.lefferts@utwente.nl
Source: ChemCatChem. 9/7/2018, Vol. 10 Issue 17, p3770-3776. 7p.
Subjects: Nitrites, Hydrogen, Chemical adsorbers, Palladium, Hydrogenation, Membrane reactors, Carbon nanofibers
Abstract: Abstract: Nitrite hydrogenation is studied in steady‐state as well as transient operation using a Pd catalyst in a tubular membrane contactor reactor. A negative reaction order in hydrogen in steady state operation proofs that hydrogen and nitrite adsorb competitively. In transient operation, feeding nitrite to the Pd surface fully covered with hydrogen results initially in very low conversion of nitrite, speeding up once hydrogen is removed from part of the Pd surface. Additional proof for competitive adsorption between hydrogen and nitrite is provided by the observation that exposure of a nitrite‐covered catalyst to hydrogen induces desorption of nitrite. Formation of ammonia in these experiments proceeds via two pathways, first via a fast reaction followed by extremely slow hydrogenation of adsorbed N atoms, which is kinetically not relevant. This information is relevant for designing effective and selective catalysts when operating at very low nitrite concentration. [ABSTRACT FROM AUTHOR]
Copyright of ChemCatChem is the property of Wiley-Blackwell 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.)
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  Data: Competitive Adsorption of Nitrite and Hydrogen on Palladium during Nitrite Hydrogenation.
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  Data: <searchLink fieldCode="AR" term="%22Postma%2C+Rolf+Sybren%22">Postma, Rolf Sybren</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Brunet Espinosa%2C+Roger%22">Brunet Espinosa, Roger</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Lefferts%2C+Leon%22">Lefferts, Leon</searchLink><relatesTo>1</relatesTo><i> l.lefferts@utwente.nl</i>
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  Data: <searchLink fieldCode="JN" term="%22ChemCatChem%22">ChemCatChem</searchLink>. 9/7/2018, Vol. 10 Issue 17, p3770-3776. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Nitrites%22">Nitrites</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen%22">Hydrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+adsorbers%22">Chemical adsorbers</searchLink><br /><searchLink fieldCode="DE" term="%22Palladium%22">Palladium</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogenation%22">Hydrogenation</searchLink><br /><searchLink fieldCode="DE" term="%22Membrane+reactors%22">Membrane reactors</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+nanofibers%22">Carbon nanofibers</searchLink>
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  Label: Abstract
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  Data: Abstract: Nitrite hydrogenation is studied in steady‐state as well as transient operation using a Pd catalyst in a tubular membrane contactor reactor. A negative reaction order in hydrogen in steady state operation proofs that hydrogen and nitrite adsorb competitively. In transient operation, feeding nitrite to the Pd surface fully covered with hydrogen results initially in very low conversion of nitrite, speeding up once hydrogen is removed from part of the Pd surface. Additional proof for competitive adsorption between hydrogen and nitrite is provided by the observation that exposure of a nitrite‐covered catalyst to hydrogen induces desorption of nitrite. Formation of ammonia in these experiments proceeds via two pathways, first via a fast reaction followed by extremely slow hydrogenation of adsorbed N atoms, which is kinetically not relevant. This information is relevant for designing effective and selective catalysts when operating at very low nitrite concentration. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of ChemCatChem is the property of Wiley-Blackwell 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: 10.1002/cctc.201800523
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      – Code: eng
        Text: English
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        PageCount: 7
        StartPage: 3770
    Subjects:
      – SubjectFull: Nitrites
        Type: general
      – SubjectFull: Hydrogen
        Type: general
      – SubjectFull: Chemical adsorbers
        Type: general
      – SubjectFull: Palladium
        Type: general
      – SubjectFull: Hydrogenation
        Type: general
      – SubjectFull: Membrane reactors
        Type: general
      – SubjectFull: Carbon nanofibers
        Type: general
    Titles:
      – TitleFull: Competitive Adsorption of Nitrite and Hydrogen on Palladium during Nitrite Hydrogenation.
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            – D: 07
              M: 09
              Text: 9/7/2018
              Type: published
              Y: 2018
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