Hydrogen generation from Al-Water reaction promoted by M-B/γ-Al2O3 (M = Co, Ni) catalyst
| Autor: | Kexi Sun, Wei-Zhuo Gai, Zhen-Yan Deng, Xianghui Zhang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Economies of agglomeration Oxide Energy Engineering and Power Technology 02 engineering and technology Active surface 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Fuel Technology Chemical engineering chemistry Particle Molecule 0210 nano-technology Hydrogen production Self-ionization of water |
| Zdroj: | International Journal of Hydrogen Energy. 44:24377-24386 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2019.07.203 |
| Popis: | Al-water reaction promoted by catalysts is a promising hydrogen generation technology. In this work, a high-activity M-B/γ-Al2O3 (M = Co, Ni) catalyst is prepared by wet chemical reduction method. It is found that M-B/γ-Al2O3 catalyst significantly promotes the Al-water reaction and decreases the induction time. When the molar ratio of γ-Al2O3 to Co-M in Co–B/γ-Al2O3 catalyst is 1:1, the induction time is only 0.43 h. The catalytic activity of M-B/γ-Al2O3 is proportional to its active area. SEM analyses show that M-B particles are dispersed on γ-Al2O3 surface, which reduces the agglomeration of M-B and increases the active surface of M-B/γ-Al2O3, leading to a high catalytic activity. A possible mechanism is proposed, which shows that the dissociation of water molecules on γ-Al2O3 surface and the microgalvanic interaction between M-B and Al can promote the hydration process of passive oxide film on Al particle surface, speeding up the Al-water reaction. |
| Databáze: | OpenAIRE |
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