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Performances of novel sulfated ceria–zirconia catalysts for the selective catalytic reduction of NOx by ethanol

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Title: Performances of novel sulfated ceria–zirconia catalysts for the selective catalytic reduction of NOx by ethanol
Authors: Westermann, Alexandre1, Azambre, Bruno bazambre@univ-metz.fr
Source: Catalysis Today. Nov2011, Vol. 176 Issue 1, p441-448. 8p.
Subjects: Cerium oxides, Zirconium oxide, Chemical reduction, Nitrogen oxides, Ethanol, Sulfates, Acetaldehyde, Chemical decomposition, Metal catalysts
Abstract: Abstract: In this study, sulfated ceria–zirconia (SCZ) catalysts with increasing Ce molar fractions (xCe=0; 0.21; 0.5; 0.75 and 1) were prepared by direct sulfation of the crystallized CZ nanopowders in 0.5M H2SO4. As revealed by XRD and TGA, the sulfation treatment created surface sulfates with a density of 2–3 SO4 2−/nm2 whatever the Ce content while maintaining the original crystalline structure of the CZ material. The investigation of ethanol-SCR performances under (1920ppm NO+3020ppm C2H5OH+5% O2) TPSR and steady-state conditions allowed to obtain N2 yields superior to 45% on the most active SCZ catalysts around 350–400°C. Catalytic results relative to the sulfated and non-sulfated catalysts are then discussed according to the Ce molar fraction and the CZ structure. The possible reaction pathways involved in the formation/decomposition of some important SCR intermediates such as ethylnitrite, acetaldehyde, HCN and NH3 are examined on the basis of the collected TPSR data. [Copyright &y& Elsevier]
Copyright of Catalysis Today 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: Performances of novel sulfated ceria–zirconia catalysts for the selective catalytic reduction of NOx by ethanol
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  Data: <searchLink fieldCode="AR" term="%22Westermann%2C+Alexandre%22">Westermann, Alexandre</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Azambre%2C+Bruno%22">Azambre, Bruno</searchLink><i> bazambre@univ-metz.fr</i>
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  Data: <searchLink fieldCode="DE" term="%22Cerium+oxides%22">Cerium oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Zirconium+oxide%22">Zirconium oxide</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reduction%22">Chemical reduction</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen+oxides%22">Nitrogen oxides</searchLink><br /><searchLink fieldCode="DE" term="%22Ethanol%22">Ethanol</searchLink><br /><searchLink fieldCode="DE" term="%22Sulfates%22">Sulfates</searchLink><br /><searchLink fieldCode="DE" term="%22Acetaldehyde%22">Acetaldehyde</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+decomposition%22">Chemical decomposition</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+catalysts%22">Metal catalysts</searchLink>
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  Data: Abstract: In this study, sulfated ceria–zirconia (SCZ) catalysts with increasing Ce molar fractions (xCe=0; 0.21; 0.5; 0.75 and 1) were prepared by direct sulfation of the crystallized CZ nanopowders in 0.5M H2SO4. As revealed by XRD and TGA, the sulfation treatment created surface sulfates with a density of 2–3 SO4 2−/nm2 whatever the Ce content while maintaining the original crystalline structure of the CZ material. The investigation of ethanol-SCR performances under (1920ppm NO+3020ppm C2H5OH+5% O2) TPSR and steady-state conditions allowed to obtain N2 yields superior to 45% on the most active SCZ catalysts around 350–400°C. Catalytic results relative to the sulfated and non-sulfated catalysts are then discussed according to the Ce molar fraction and the CZ structure. The possible reaction pathways involved in the formation/decomposition of some important SCR intermediates such as ethylnitrite, acetaldehyde, HCN and NH3 are examined on the basis of the collected TPSR data. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Catalysis Today 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.cattod.2010.10.071
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Zirconium oxide
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      – SubjectFull: Chemical reduction
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      – SubjectFull: Nitrogen oxides
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      – SubjectFull: Ethanol
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      – SubjectFull: Acetaldehyde
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      – SubjectFull: Metal catalysts
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      – TitleFull: Performances of novel sulfated ceria–zirconia catalysts for the selective catalytic reduction of NOx by ethanol
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              Text: Nov2011
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