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

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1292
Author(s):  
Jeongyoon Ahn ◽  
Woojin Chung ◽  
Soonwoong Chang

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 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 (H2S) 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 H2S during the CO2 + H2 reaction to evaluate the toxic effect of H2S 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 H2S by applying H2 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 H2S is included in the reaction gas of industrial processes (landfill gas, fire extinguishing tank gas, etc.) that can be linked to CO2 methanation.

2019 ◽  
Vol 377 ◽  
pp. 120461 ◽  
Author(s):  
Antonio Ricca ◽  
Livia Truda ◽  
Vincenzo Palma

Fuel ◽  
2021 ◽  
Vol 283 ◽  
pp. 118867 ◽  
Author(s):  
Xianglan Xu ◽  
Yunyan Tong ◽  
Jin Huang ◽  
Jia Zhu ◽  
Xiuzhong Fang ◽  
...  

2020 ◽  
Vol 22 (34) ◽  
pp. 18788-18797 ◽  
Author(s):  
Gianfranco Giorgianni ◽  
Chalachew Mebrahtu ◽  
Manfred Erwin Schuster ◽  
Alexander Ian Large ◽  
Georg Held ◽  
...  

In situ surface sensitive XPS and NEXAFS clarify the promotion effect of Fe in Ni–Fe/hydrotalcite-derived catalysts for the CO2 methanation reaction.


2020 ◽  
Vol 12 (15) ◽  
pp. 17436-17442 ◽  
Author(s):  
Lingzhen Zeng ◽  
Yongke Wang ◽  
Zhe Li ◽  
Yang Song ◽  
Jingzheng Zhang ◽  
...  

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1112 ◽  
Author(s):  
Rei-Yu Chein ◽  
Chih-Chang Wang

CO2 methanation is recognized as one of the best technologies for storing intermittent renewable energy in the form of CH4. In this study, CO2 methanation performance is investigated using Ni/Al2O3, Ru/Al2O3, and Ru-Ni/Al2O3 as the catalysts under conditions of atmospheric pressure, a molar ratio of H2/CO2 = 5, and a space velocity of 5835 h−1. For reaction temperatures ranging from 250 to 550 °C, it was found that the optimum reaction temperature is 400 °C for all catalysts studied. At this temperature, the maximum values of CO2 conversion, H2 efficiency, and CH4 yield and lowest CO yield can be obtained. With temperatures higher than 400 °C, reverse CO2 methanation results in CO2 conversion and CH4 yield decreases with increased temperature, while CO is formed due to reverse water-gas shift reaction. The experimental results showed that CO2 methanation performance at low temperatures can be enhanced greatly using the bimetallic Ru-Ni catalyst compared with the monometallic Ru or Ni catalyst. Under ascending-descending temperature changes between 250 °C and 550 °C, good thermal stability is obtained from Ru-Ni/Al2O3 catalyst. About a 3% decrease in CO2 conversion is found after three continuous cycles (74 h) test.


2018 ◽  
Vol 307 ◽  
pp. 205-211 ◽  
Author(s):  
Dominik Wierzbicki ◽  
Monika Motak ◽  
Teresa Grzybek ◽  
Maria Elena Gálvez ◽  
Patrick Da Costa

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