Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane
Solid solutions Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4±δ</sub> (x = 0, 0.5, 1, 1.2, 1.4) with a K<sub>2</sub>NiF<sub>4</sub> structure can be obtained from freeze-dried precursors. The end members of this series can be obtained at T ≥ 1000...
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MDPI AG
2023-06-01
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| author | Oleg A. Shlyakhtin Grigoriy M. Timofeev Sergey A. Malyshev Alexey S. Loktev Galina N. Mazo Tatiana Shatalova Veronika Arkhipova Ilya V. Roslyakov Alexey G. Dedov |
| author_facet | Oleg A. Shlyakhtin Grigoriy M. Timofeev Sergey A. Malyshev Alexey S. Loktev Galina N. Mazo Tatiana Shatalova Veronika Arkhipova Ilya V. Roslyakov Alexey G. Dedov |
| author_sort | Oleg A. Shlyakhtin |
| collection | DOAJ |
| description | Solid solutions Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4±δ</sub> (x = 0, 0.5, 1, 1.2, 1.4) with a K<sub>2</sub>NiF<sub>4</sub> structure can be obtained from freeze-dried precursors. The end members of this series can be obtained at T ≥ 1000 °C only, while complex oxides with x = 1; 1.5 are formed at T ≥ 700 °C. Thermal analysis revealed the two stages of Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4±δ</sub> thermal reduction in a 10%H<sub>2</sub>/Ar gas mixture that was completed at 900 °C. For x < 0.2, the reduction products demonstrated an exsolution-like morphology with Ni nanoparticles allocated at the surface of oxide grains. As-obtained nanocomposites with x = 0 and x > 1 revealed the outstanding catalytic activity and selectivity in the dry reforming of the methane (DRM) reaction at 800 °C with CH<sub>4</sub> conversion close to the thermodynamic values. The appearance of two different maxima of the catalytic properties of Ni/(Nd<sub>2</sub>O<sub>3</sub>,SrCO<sub>3</sub>) nanocomposites could be affiliated with the domination of the positive contributions of Nd<sub>2</sub>O<sub>3</sub> and SrCO<sub>3</sub>, respectively. |
| first_indexed | 2024-03-11T02:39:30Z |
| format | Article |
| id | doaj.art-23d277cad517492d973807802d4146f8 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-11T02:39:30Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-23d277cad517492d973807802d4146f82023-11-18T09:41:51ZengMDPI AGCatalysts2073-43442023-06-0113696610.3390/catal13060966Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of MethaneOleg A. Shlyakhtin0Grigoriy M. Timofeev1Sergey A. Malyshev2Alexey S. Loktev3Galina N. Mazo4Tatiana Shatalova5Veronika Arkhipova6Ilya V. Roslyakov7Alexey G. Dedov8Department of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991 Moscow, RussiaDepartment of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of Chemistry, M.V. Lomonosov Moscow State University, 119991 Moscow, RussiaDepartment of General and Applied Chemistry, Gubkin Russian State University of Oil and Gas, 119991 Moscow, RussiaN.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991 Moscow, RussiaA.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991 Moscow, RussiaSolid solutions Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4±δ</sub> (x = 0, 0.5, 1, 1.2, 1.4) with a K<sub>2</sub>NiF<sub>4</sub> structure can be obtained from freeze-dried precursors. The end members of this series can be obtained at T ≥ 1000 °C only, while complex oxides with x = 1; 1.5 are formed at T ≥ 700 °C. Thermal analysis revealed the two stages of Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4±δ</sub> thermal reduction in a 10%H<sub>2</sub>/Ar gas mixture that was completed at 900 °C. For x < 0.2, the reduction products demonstrated an exsolution-like morphology with Ni nanoparticles allocated at the surface of oxide grains. As-obtained nanocomposites with x = 0 and x > 1 revealed the outstanding catalytic activity and selectivity in the dry reforming of the methane (DRM) reaction at 800 °C with CH<sub>4</sub> conversion close to the thermodynamic values. The appearance of two different maxima of the catalytic properties of Ni/(Nd<sub>2</sub>O<sub>3</sub>,SrCO<sub>3</sub>) nanocomposites could be affiliated with the domination of the positive contributions of Nd<sub>2</sub>O<sub>3</sub> and SrCO<sub>3</sub>, respectively.https://www.mdpi.com/2073-4344/13/6/966metal–oxide nanocompositesmulticomponent catalystscomplex oxide precursorsK<sub>2</sub>NiF<sub>4</sub> structurehigh temperature reductionexsolution |
| spellingShingle | Oleg A. Shlyakhtin Grigoriy M. Timofeev Sergey A. Malyshev Alexey S. Loktev Galina N. Mazo Tatiana Shatalova Veronika Arkhipova Ilya V. Roslyakov Alexey G. Dedov Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane Catalysts metal–oxide nanocomposites multicomponent catalysts complex oxide precursors K<sub>2</sub>NiF<sub>4</sub> structure high temperature reduction exsolution |
| title | Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane |
| title_full | Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane |
| title_fullStr | Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane |
| title_full_unstemmed | Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane |
| title_short | Nd<sub>2−x</sub>Sr<sub>x</sub>NiO<sub>4</sub> Solid Solutions: Synthesis, Structure and Enhanced Catalytic Properties of Their Reduction Products in the Dry Reforming of Methane |
| title_sort | nd sub 2 x sub sr sub x sub nio sub 4 sub solid solutions synthesis structure and enhanced catalytic properties of their reduction products in the dry reforming of methane |
| topic | metal–oxide nanocomposites multicomponent catalysts complex oxide precursors K<sub>2</sub>NiF<sub>4</sub> structure high temperature reduction exsolution |
| url | https://www.mdpi.com/2073-4344/13/6/966 |
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