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Ag-Cu based catalysts for the selective ammonia oxidation into nitrogen and water vapour.

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Title: Ag-Cu based catalysts for the selective ammonia oxidation into nitrogen and water vapour.
Authors: Jabłońska, Magdalena1,2 Jablonska@itmc.rwth-aachen.de, Beale, Andrew M.3,4, Nocuń, Marek5, Palkovits, Regina1,2 Palkovits@itmc.rwth-aachen.de
Source: Applied Catalysis B: Environment & Energy. Sep2018, Vol. 232, p275-287. 13p.
Subjects: Silver catalysts, Ammonia, Nitrogen, Water vapor, Catalytic activity
Abstract: XRD, BET, H 2 -TPR, UV–vis-DRS, XPS and XAFS were used to characterize a series of Ag and/or Cu – Ag (1–5%), Cu (10–15%) or Ag-Cu (1–1, 1–10, 1.5–10, 5–5% of metal) – supported on γ-Al 2 O 3 . Correlation between physicochemical properties, catalytic activity and selectivity in NH 3 -SCO were thoroughly investigated. Silver species mainly in the form of Ag 2 O on the Ag/Al 2 O 3 catalysts led to enhanced activity together with drop in N 2 selectivity with increasing silver loading up to 5%. A mixture of CuO and CuAl 2 O 4 formed on the Cu/Al 2 O 3 catalysts. Easily reducible highly dispersed CuO x promoted the activity of the catalysts, while bulk CuO x and CuAl 2 O 4 decreased N 2 selectivity up to 500 °C. The activity of all Cu-containing materials was inferior to Ag-containing ones. Thus, the gap between the high conversion temperature over Cu/Al 2 O 3 and low N 2 selectivity over Ag/Al 2 O 3 was bridged by applying the Ag-Cu/Al 2 O 3 catalysts, with the optimum loading of 1.5 and 10 wt.% for silver and copper, respectively. NH 3 -TPD, NH 3 -TPSR and in situ FTIR were used to determine the in situ selective catalytic reduction (i-SCR) mechanism over 1.5% Ag/Al 2 O 3 , 10% Cu/Al 2 O 3 and 1.5% Ag-10% Cu/Al 2 O 3 respectively. The i-SCR mechanism involved the partial oxidation of NH 3 into NO x species, along with adsorbed NO x species interacting with adsorbed ammonia (NH x species) and being reduced to reaction products. [ABSTRACT FROM AUTHOR]
Copyright of Applied Catalysis B: Environment & Energy 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.)
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  Data: Ag-Cu based catalysts for the selective ammonia oxidation into nitrogen and water vapour.
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  Data: <searchLink fieldCode="AR" term="%22Jabłońska%2C+Magdalena%22">Jabłońska, Magdalena</searchLink><relatesTo>1,2</relatesTo><i> Jablonska@itmc.rwth-aachen.de</i><br /><searchLink fieldCode="AR" term="%22Beale%2C+Andrew+M%2E%22">Beale, Andrew M.</searchLink><relatesTo>3,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Nocuń%2C+Marek%22">Nocuń, Marek</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Palkovits%2C+Regina%22">Palkovits, Regina</searchLink><relatesTo>1,2</relatesTo><i> Palkovits@itmc.rwth-aachen.de</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+B%3A+Environment+%26+Energy%22">Applied Catalysis B: Environment & Energy</searchLink>. Sep2018, Vol. 232, p275-287. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Silver+catalysts%22">Silver catalysts</searchLink><br /><searchLink fieldCode="DE" term="%22Ammonia%22">Ammonia</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen%22">Nitrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Water+vapor%22">Water vapor</searchLink><br /><searchLink fieldCode="DE" term="%22Catalytic+activity%22">Catalytic activity</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: XRD, BET, H 2 -TPR, UV–vis-DRS, XPS and XAFS were used to characterize a series of Ag and/or Cu – Ag (1–5%), Cu (10–15%) or Ag-Cu (1–1, 1–10, 1.5–10, 5–5% of metal) – supported on γ-Al 2 O 3 . Correlation between physicochemical properties, catalytic activity and selectivity in NH 3 -SCO were thoroughly investigated. Silver species mainly in the form of Ag 2 O on the Ag/Al 2 O 3 catalysts led to enhanced activity together with drop in N 2 selectivity with increasing silver loading up to 5%. A mixture of CuO and CuAl 2 O 4 formed on the Cu/Al 2 O 3 catalysts. Easily reducible highly dispersed CuO x promoted the activity of the catalysts, while bulk CuO x and CuAl 2 O 4 decreased N 2 selectivity up to 500 °C. The activity of all Cu-containing materials was inferior to Ag-containing ones. Thus, the gap between the high conversion temperature over Cu/Al 2 O 3 and low N 2 selectivity over Ag/Al 2 O 3 was bridged by applying the Ag-Cu/Al 2 O 3 catalysts, with the optimum loading of 1.5 and 10 wt.% for silver and copper, respectively. NH 3 -TPD, NH 3 -TPSR and in situ FTIR were used to determine the in situ selective catalytic reduction (i-SCR) mechanism over 1.5% Ag/Al 2 O 3 , 10% Cu/Al 2 O 3 and 1.5% Ag-10% Cu/Al 2 O 3 respectively. The i-SCR mechanism involved the partial oxidation of NH 3 into NO x species, along with adsorbed NO x species interacting with adsorbed ammonia (NH x species) and being reduced to reaction products. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Applied Catalysis B: Environment & Energy 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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      – Type: doi
        Value: 10.1016/j.apcatb.2018.03.029
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 275
    Subjects:
      – SubjectFull: Silver catalysts
        Type: general
      – SubjectFull: Ammonia
        Type: general
      – SubjectFull: Nitrogen
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      – SubjectFull: Water vapor
        Type: general
      – SubjectFull: Catalytic activity
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    Titles:
      – TitleFull: Ag-Cu based catalysts for the selective ammonia oxidation into nitrogen and water vapour.
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            NameFull: Jabłońska, Magdalena
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            NameFull: Beale, Andrew M.
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            NameFull: Nocuń, Marek
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            NameFull: Palkovits, Regina
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            – D: 15
              M: 09
              Text: Sep2018
              Type: published
              Y: 2018
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            – TitleFull: Applied Catalysis B: Environment & Energy
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