Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the Support
Herein, Ir/CeO<sub>2</sub> catalysts were prepared using the deposition–precipitation method with NaOH or urea as the precipitating agent or using sol immobilization with tetrakis(hydroxymethyl)phosphonium chloride (THPC) as the protective and reducing agent. The effect of the preparatio...
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MDPI AG
2024-02-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/14/2/119 |
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| author | Silvio Bellomi Davide Motta Marta Stucchi Laura Prati Nikolaos Dimitratos Alberto Villa |
| author_facet | Silvio Bellomi Davide Motta Marta Stucchi Laura Prati Nikolaos Dimitratos Alberto Villa |
| author_sort | Silvio Bellomi |
| collection | DOAJ |
| description | Herein, Ir/CeO<sub>2</sub> catalysts were prepared using the deposition–precipitation method with NaOH or urea as the precipitating agent or using sol immobilization with tetrakis(hydroxymethyl)phosphonium chloride (THPC) as the protective and reducing agent. The effect of the preparation method on Ir catalyst activity was evaluated in the liquid-phase catalytic decomposition of hydrous hydrazine to hydrogen. Ir/CeO<sub>2</sub> prepared using sol immobilization and DP NaOH showed the best activity (1740 h<sup>−1</sup> and 1541 h<sup>−1</sup>, respectively) and yield of hydrogen (36.6 and 38.9%). Additionally, the effect of the support was considered, using TiO<sub>2</sub> and NiO in addition to CeO<sub>2</sub>. For this purpose, the sol immobilization of preformed nanoparticles technique was considered because it allows the same morphology of the immobilized particles to be maintained, regardless of the support. Ir deposited on NiO resulted in the most selective catalyst with a H<sub>2</sub> yield of 83.9%, showing good stability during recycling tests. The catalysts were characterized using different techniques: X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with an X-ray detector (EDX) and inductively coupled plasma–mass spectroscopy (ICP-MS). |
| first_indexed | 2024-03-07T22:39:02Z |
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| id | doaj.art-ccf219827a3b4882a2cb379a08f04bf5 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-07T22:39:02Z |
| publishDate | 2024-02-01 |
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| series | Catalysts |
| spelling | doaj.art-ccf219827a3b4882a2cb379a08f04bf52024-02-23T15:11:29ZengMDPI AGCatalysts2073-43442024-02-0114211910.3390/catal14020119Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the SupportSilvio Bellomi0Davide Motta1Marta Stucchi2Laura Prati3Nikolaos Dimitratos4Alberto Villa5Dipartimento di Chimica, Università degli Studi di Milano, 20133 Milano, ItalyCardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, UKDipartimento di Chimica, Università degli Studi di Milano, 20133 Milano, ItalyDipartimento di Chimica, Università degli Studi di Milano, 20133 Milano, ItalyDipartimento di Chimica Industriale “Toso Montanari”, Alma Mater Studiorum Università di Bologna, Viale Risorgimento 4, 40126 Bologna, ItalyDipartimento di Chimica, Università degli Studi di Milano, 20133 Milano, ItalyHerein, Ir/CeO<sub>2</sub> catalysts were prepared using the deposition–precipitation method with NaOH or urea as the precipitating agent or using sol immobilization with tetrakis(hydroxymethyl)phosphonium chloride (THPC) as the protective and reducing agent. The effect of the preparation method on Ir catalyst activity was evaluated in the liquid-phase catalytic decomposition of hydrous hydrazine to hydrogen. Ir/CeO<sub>2</sub> prepared using sol immobilization and DP NaOH showed the best activity (1740 h<sup>−1</sup> and 1541 h<sup>−1</sup>, respectively) and yield of hydrogen (36.6 and 38.9%). Additionally, the effect of the support was considered, using TiO<sub>2</sub> and NiO in addition to CeO<sub>2</sub>. For this purpose, the sol immobilization of preformed nanoparticles technique was considered because it allows the same morphology of the immobilized particles to be maintained, regardless of the support. Ir deposited on NiO resulted in the most selective catalyst with a H<sub>2</sub> yield of 83.9%, showing good stability during recycling tests. The catalysts were characterized using different techniques: X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with an X-ray detector (EDX) and inductively coupled plasma–mass spectroscopy (ICP-MS).https://www.mdpi.com/2073-4344/14/2/119iridiummetal oxideshydrous hydrazinehydrogen productionsupport effect |
| spellingShingle | Silvio Bellomi Davide Motta Marta Stucchi Laura Prati Nikolaos Dimitratos Alberto Villa Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the Support Catalysts iridium metal oxides hydrous hydrazine hydrogen production support effect |
| title | Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the Support |
| title_full | Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the Support |
| title_fullStr | Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the Support |
| title_full_unstemmed | Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the Support |
| title_short | Hydrogen Production from Hydrous Hydrazine Decomposition Using Ir Catalysts: Effect of the Preparation Method and the Support |
| title_sort | hydrogen production from hydrous hydrazine decomposition using ir catalysts effect of the preparation method and the support |
| topic | iridium metal oxides hydrous hydrazine hydrogen production support effect |
| url | https://www.mdpi.com/2073-4344/14/2/119 |
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