Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization
Layered Ni-Mg-Al hydroxides with (Ni + Mg)/Al = 2.5 differing in Mg/Ni ratios and related oxide systems have been synthesized and characterized. Ni-Mg-Al hydroxides were prepared by the coprecipitation method. It was found that the samples dried at 110 °C were layered Ni-Mg-Al hydroxides with a hydr...
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MDPI AG
2023-03-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/13/4/678 |
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| author | Zaliya A. Fedorova Vadim A. Borisov Vera P. Pakharukova Evgeniy Y. Gerasimov Vladimir D. Belyaev Tatyana I. Gulyaeva Dmitriy A. Shlyapin Pavel V. Snytnikov |
| author_facet | Zaliya A. Fedorova Vadim A. Borisov Vera P. Pakharukova Evgeniy Y. Gerasimov Vladimir D. Belyaev Tatyana I. Gulyaeva Dmitriy A. Shlyapin Pavel V. Snytnikov |
| author_sort | Zaliya A. Fedorova |
| collection | DOAJ |
| description | Layered Ni-Mg-Al hydroxides with (Ni + Mg)/Al = 2.5 differing in Mg/Ni ratios and related oxide systems have been synthesized and characterized. Ni-Mg-Al hydroxides were prepared by the coprecipitation method. It was found that the samples dried at 110 °C were layered Ni-Mg-Al hydroxides with a hydrotalcite-type structure. After the heat treatment at 600 °C, the formation of Ni-Mg-Al-mixed oxides with a specific nanostructure, an intermediate between a NaCl and spinel structure, took place. According to XRD data, it had the unit cell parameter a = 4.174–4.181 Å, and a crystallite size of 4.0 nm. The specific surface area of the Ni-Mg-Al samples dried at 110 °C was 45–54 m<sup>2</sup>/g, and that of those calcined at 600 °C was 156.1–209.1 m<sup>2</sup>/g. In agreement with HRTEM data, in all the synthesized nickel catalysts reduced at 700 °C (H<sub>2</sub>), particle size was mainly distributed between 15–20 nm. The catalyst activity of LDH-derived Ni-Mg-Al catalysts in ammonia decomposition was studied in a fixed-bed flow-type reactor at an atmospheric pressure within the temperature range 500–700 °C. The synthesized catalysts overcame existing analogues in catalytic performance. At a process temperature of 500 °C, the Ni<sub>2</sub>Mg<sub>3</sub>Al<sub>2</sub>-HT catalyst showed that the H<sub>2</sub> productivity was 23.8 mmol/(g<sub>cat</sub>·min), exceeding the respective value of nickel catalysts reported in the literature. |
| first_indexed | 2024-03-11T05:09:39Z |
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| id | doaj.art-f8200ed32abf4a4abcc3a84337d3fe63 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-11T05:09:39Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
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| series | Catalysts |
| spelling | doaj.art-f8200ed32abf4a4abcc3a84337d3fe632023-11-17T18:41:02ZengMDPI AGCatalysts2073-43442023-03-0113467810.3390/catal13040678Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and CharacterizationZaliya A. Fedorova0Vadim A. Borisov1Vera P. Pakharukova2Evgeniy Y. Gerasimov3Vladimir D. Belyaev4Tatyana I. Gulyaeva5Dmitriy A. Shlyapin6Pavel V. Snytnikov7Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630128, RussiaCenter of New Chemical Technologies BIC, Boreskov Institute of Catalysis SB RAS, Neftezavodskaya St. 54, Omsk 644040, RussiaBoreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk 630090, RussiaBoreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk 630090, RussiaInstitute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk 630128, RussiaCenter of New Chemical Technologies BIC, Boreskov Institute of Catalysis SB RAS, Neftezavodskaya St. 54, Omsk 644040, RussiaCenter of New Chemical Technologies BIC, Boreskov Institute of Catalysis SB RAS, Neftezavodskaya St. 54, Omsk 644040, RussiaBoreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk 630090, RussiaLayered Ni-Mg-Al hydroxides with (Ni + Mg)/Al = 2.5 differing in Mg/Ni ratios and related oxide systems have been synthesized and characterized. Ni-Mg-Al hydroxides were prepared by the coprecipitation method. It was found that the samples dried at 110 °C were layered Ni-Mg-Al hydroxides with a hydrotalcite-type structure. After the heat treatment at 600 °C, the formation of Ni-Mg-Al-mixed oxides with a specific nanostructure, an intermediate between a NaCl and spinel structure, took place. According to XRD data, it had the unit cell parameter a = 4.174–4.181 Å, and a crystallite size of 4.0 nm. The specific surface area of the Ni-Mg-Al samples dried at 110 °C was 45–54 m<sup>2</sup>/g, and that of those calcined at 600 °C was 156.1–209.1 m<sup>2</sup>/g. In agreement with HRTEM data, in all the synthesized nickel catalysts reduced at 700 °C (H<sub>2</sub>), particle size was mainly distributed between 15–20 nm. The catalyst activity of LDH-derived Ni-Mg-Al catalysts in ammonia decomposition was studied in a fixed-bed flow-type reactor at an atmospheric pressure within the temperature range 500–700 °C. The synthesized catalysts overcame existing analogues in catalytic performance. At a process temperature of 500 °C, the Ni<sub>2</sub>Mg<sub>3</sub>Al<sub>2</sub>-HT catalyst showed that the H<sub>2</sub> productivity was 23.8 mmol/(g<sub>cat</sub>·min), exceeding the respective value of nickel catalysts reported in the literature.https://www.mdpi.com/2073-4344/13/4/678nickel catalystshydrotalcite-derived catalystsNi-Mg-Al-double layered hydroxides Ni-Mg-Al mixed oxideammonia decompositionH<sub>2</sub> production |
| spellingShingle | Zaliya A. Fedorova Vadim A. Borisov Vera P. Pakharukova Evgeniy Y. Gerasimov Vladimir D. Belyaev Tatyana I. Gulyaeva Dmitriy A. Shlyapin Pavel V. Snytnikov Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization Catalysts nickel catalysts hydrotalcite-derived catalysts Ni-Mg-Al-double layered hydroxides Ni-Mg-Al mixed oxide ammonia decomposition H<sub>2</sub> production |
| title | Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization |
| title_full | Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization |
| title_fullStr | Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization |
| title_full_unstemmed | Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization |
| title_short | Layered Double Hydroxide-Derived Ni-Mg-Al Catalysts for Ammonia Decomposition Process: Synthesis and Characterization |
| title_sort | layered double hydroxide derived ni mg al catalysts for ammonia decomposition process synthesis and characterization |
| topic | nickel catalysts hydrotalcite-derived catalysts Ni-Mg-Al-double layered hydroxides Ni-Mg-Al mixed oxide ammonia decomposition H<sub>2</sub> production |
| url | https://www.mdpi.com/2073-4344/13/4/678 |
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