| Autor: |
Sarangi, Prakash K., Srivastava, Rajesh Kumar, Singh, Akhilesh K., Shadangi, Krushna P., Vivekanand, Vivekanand, Subudhi, Sanjukta, Singh, Thangjam A., Sahoo, Uttam K., Prus, Piotr, Șmuleac, Laura, Pașcalau, Raul, Imbrea, Florin |
| Zdroj: |
International Agrophysics; 2024, Vol. 38 Issue 4, p325-344, 20p |
| Abstrakt: |
Thermochemical processes have recently attracted more attentions from researchers, particularly the use of decomposition of ammonia-based compounds and water-gas shift and steam reforming processes. These processes may be applied for hydrogen generation (H2) from a syngas mixture and that is the main concern of this paper. Furthermore, these processes are currently facing the challenge of low hydrogen yields. Traditionally, H2 fuel is generated from fossil fuels by utilizing different reforming processes. The longevity and reliability of catalysts, their purity and the start-up time/costs are also some of the critical challenges to be faced. Sustainable H2 generation from sustainable sources like ammonia (NH3) gas was found to be an innovative process with the appropriate selection of the catalytic process and also thermochemical processes being shown to be critical issues. Traditional approaches to H2 synthesis such as the ammonia cracking process and the generation of hydrogen occur at high temperatures of 500oC or more. Current efforts in the field of H2 generation rely on a process which includes the decomposition of ammonia gas, this achieves a high yield through the application of alkali metal amide/imides as effective catalysts. NH3 and methane (CH4) decomposition is exploited for H2 production through the application of a steam methane reforming process in bench scale packed-bed reactors. This requires an NH3 feed solution at a temperature of 150oC that can generate more H2 (up to 90%) in the total syngas yield. Efforts were made to change/shift the equilibrium towards increased hydrogen production. Researchers have engaged in many efforts to remove H2 from a membrane or in carbon dioxide extraction with the use of a solid sorbent. A continuous mode of enhanced H2 production can be achieved by integrating the reforming process with concentrated solar radiation for thermal storage. Efforts were made to remove H2 from a membrane or extract carbon dioxide using a solid sorbent. This review explores the decomposition techniques, catalytic systems and thermochemical conditions required for H2 generation from NH3/NH3-rich products/wastes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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