Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction
The carbon dioxide (CO<sub>2</sub>) methanation reaction is a process that produces methane (CH<sub>4</sub>) by reacting CO<sub>2</sub> and H<sub>2</sub>. Many studies have been conducted on this process because it enables a reduction of greenhouse gas...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/2a666ae56e854f509036aeed8b74f71c |
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| Sumario: | The carbon dioxide (CO<sub>2</sub>) methanation reaction is a process that produces methane (CH<sub>4</sub>) by reacting CO<sub>2</sub> and H<sub>2</sub>. Many studies have been conducted on this process because it enables a reduction of greenhouse gases and the production of energy with carbon neutrality. Moreover, it also exhibits a higher efficiency at low temperatures due to its thermodynamic characteristics; thus, there have been many studies, particularly on the catalysts that are driven at low temperatures and have high durability. However, with regards to employing this process in actual industrial processes, studies on both toxic substances that can influence catalyst performance and regeneration are still insufficient. Therefore, in this paper, the activity of a Ni catalyst before and after hydrogen sulfide (H<sub>2</sub>S) exposure was compared and an in-depth analysis was conducted to reveal the activity performance through the regeneration treatment of the poisoned catalyst. This study observed the reaction activity changes when injecting H<sub>2</sub>S during the CO<sub>2</sub> + H<sub>2</sub> reaction to evaluate the toxic effect of H<sub>2</sub>S on the Ni-Ce-Zr catalyst, in which the results indicate that the reaction activity decreases rapidly at 220 °C. Next, this study also successfully conducted a regeneration of the Ni-Ce-Zr catalyst that was poisoned with H<sub>2</sub>S by applying H<sub>2</sub> heat treatment. It is expected that the results of this study can be used as fundamental data in an alternative approach to performance recovery when a small amount of H<sub>2</sub>S is included in the reaction gas of industrial processes (landfill gas, fire extinguishing tank gas, etc.) that can be linked to CO<sub>2</sub> methanation. |
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