Deactivation and Regeneration Method for Ni Catalysts by H2S Poisoning in CO2 Methanation Reaction

The carbon dioxide (CO2) methanation reaction is a process that produces methane (CH4) by reacting CO2 and H2. Many studies have been conducted on this process because it enables a reduction of greenhouse gas...

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Autores principales:	Jeongyoon Ahn, Woojin Chung, Soonwoong Chang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	methanation CO<sub>2</sub> utilization CO<sub>2</sub> conversion deactivation regeneration H<sub>2</sub>S poisoning Chemical technology TP1-1185 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/2a666ae56e854f509036aeed8b74f71c
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spelling	oai:doaj.org-article:2a666ae56e854f509036aeed8b74f71c2021-11-25T17:05:31ZDeactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction10.3390/catal111112922073-4344https://doaj.org/article/2a666ae56e854f509036aeed8b74f71c2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4344/11/11/1292https://doaj.org/toc/2073-4344The 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.Jeongyoon AhnWoojin ChungSoonwoong ChangMDPI AGarticlemethanationCO<sub>2</sub> utilizationCO<sub>2</sub> conversiondeactivationregenerationH<sub>2</sub>S poisoningChemical technologyTP1-1185ChemistryQD1-999ENCatalysts, Vol 11, Iss 1292, p 1292 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	methanation CO<sub>2</sub> utilization CO<sub>2</sub> conversion deactivation regeneration H<sub>2</sub>S poisoning Chemical technology TP1-1185 Chemistry QD1-999
spellingShingle	methanation CO<sub>2</sub> utilization CO<sub>2</sub> conversion deactivation regeneration H<sub>2</sub>S poisoning Chemical technology TP1-1185 Chemistry QD1-999 Jeongyoon Ahn Woojin Chung Soonwoong Chang Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction
description	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.
format	article
author	Jeongyoon Ahn Woojin Chung Soonwoong Chang
author_facet	Jeongyoon Ahn Woojin Chung Soonwoong Chang
author_sort	Jeongyoon Ahn
title	Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction
title_short	Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction
title_full	Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction
title_fullStr	Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction
title_full_unstemmed	Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction
title_sort	deactivation and regeneration method for ni catalysts by h<sub>2</sub>s poisoning in co<sub>2</sub> methanation reaction
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2a666ae56e854f509036aeed8b74f71c
work_keys_str_mv	AT jeongyoonahn deactivationandregenerationmethodfornicatalystsbyhsub2subspoisoningincosub2submethanationreaction AT woojinchung deactivationandregenerationmethodfornicatalystsbyhsub2subspoisoningincosub2submethanationreaction AT soonwoongchang deactivationandregenerationmethodfornicatalystsbyhsub2subspoisoningincosub2submethanationreaction
_version_	1718412703515541504

Deactivation and Regeneration Method for Ni Catalysts by H<sub>2</sub>S Poisoning in CO<sub>2</sub> Methanation Reaction

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