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Abstract <p>Сommercial cerium-zirconium oxide supports (Ce<sub>0.5</sub>Zr<sub>0.5</sub>O<sub>2</sub>, Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub> and Ce<sub>0.4</sub>Zr<sub>0.5</sub>Y<sub>0.05</sub>La<sub>0.05</sub>O<sub>2</sub>) were used to prepare Ru/CeZrO<sub><i>x</i></sub> catalysts by the sorption-hydrolytic method with ruthenium loading of ~2 wt %. The catalyst specific surface areas ranged within 80–91 m<sup>2</sup>/g. The XRD data indicate the formation of a substitutional solid solution. According to the HRTEM data, there are no ruthenium particles on the support surface in Ru/Се<sub>0.75</sub>Zr<sub>0.25</sub>О<sub>2</sub> and Ru/Ce<sub>0.4</sub>Zr<sub>0.5</sub>Y<sub>0.05</sub>La<sub>0.05</sub>O<sub>2</sub> samples. Most likely, the ruthenium particles are in a highly dispersed state. At 500°C and WHSV of 300 000 <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10975_2025_8576_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="48" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{m}}{{{\text{L}}}_{{{\text{N}}{{{\text{H}}}_{{\text{3}}}}}}}\)</EquationSource> <!--KinCat2560042Fedorova-m1--> </InlineEquation> <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10975_2025_8576_Article_IEq2.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{g}}_{{{\text{cat}}}}^{{-1}}\)</EquationSource> <!--KinCat2560042Fedorova-m2--> </InlineEquation> h<sup>–1</sup>, the catalysts demonstrated the highest hydrogen productivity of 73.8–85.4 <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10975_2025_8576_Article_IEq3.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="55" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{mmo}}{{{\text{l}}}_{{{{{\text{H}}}_{{\text{2}}}}}}}\)</EquationSource> <!--KinCat2560042Fedorova-m3--> </InlineEquation> <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10975_2025_8576_Article_IEq2.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\({\text{g}}_{{{\text{cat}}}}^{{-1}}\)</EquationSource> <!--KinCat2560042Fedorova-m4--> </InlineEquation> min<sup>–1</sup>) and NH<sub>3</sub> conversion of 22–25.5% that compares well with the best results reported in the literature and exceeds the catalysts performance we have previously obtained for Ru/Ce<sub>0.75</sub>Zr<sub>0.25</sub>O<sub>2</sub> catalyst prepared by impregnation. The activity of most active Ru/Ce<sub>0.4</sub>Zr<sub>0.5</sub>Y<sub>0.05</sub>La<sub>0.05</sub> catalyst remained stable throughout the all test period (~46 h).</p>

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Ammonia Decomposition for Hydrogen Production on Се1 – хZrхО2 Based Ru Catalysts

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Z. A. Fedorova,
  • V. A. Borisov,
  • V. L. Temerev,
  • E. Y. Gerasimov,
  • D. A. Svintsitskiy,
  • D. A. Shlyapin,
  • P. V. Snytnikov

摘要

Abstract

Сommercial cerium-zirconium oxide supports (Ce0.5Zr0.5O2, Ce0.75Zr0.25O2 and Ce0.4Zr0.5Y0.05La0.05O2) were used to prepare Ru/CeZrOx catalysts by the sorption-hydrolytic method with ruthenium loading of ~2 wt %. The catalyst specific surface areas ranged within 80–91 m2/g. The XRD data indicate the formation of a substitutional solid solution. According to the HRTEM data, there are no ruthenium particles on the support surface in Ru/Се0.75Zr0.25О2 and Ru/Ce0.4Zr0.5Y0.05La0.05O2 samples. Most likely, the ruthenium particles are in a highly dispersed state. At 500°C and WHSV of 300 000 \({\text{m}}{{{\text{L}}}_{{{\text{N}}{{{\text{H}}}_{{\text{3}}}}}}}\) \({\text{g}}_{{{\text{cat}}}}^{{-1}}\) h–1, the catalysts demonstrated the highest hydrogen productivity of 73.8–85.4 \({\text{mmo}}{{{\text{l}}}_{{{{{\text{H}}}_{{\text{2}}}}}}}\) \({\text{g}}_{{{\text{cat}}}}^{{-1}}\) min–1) and NH3 conversion of 22–25.5% that compares well with the best results reported in the literature and exceeds the catalysts performance we have previously obtained for Ru/Ce0.75Zr0.25O2 catalyst prepared by impregnation. The activity of most active Ru/Ce0.4Zr0.5Y0.05La0.05 catalyst remained stable throughout the all test period (~46 h).