Solution plasma-assisted preparation of highly dispersed NiMnAl-LDO catalyst to enhance low-temperature activity of CO2 methanation

• Published in: International journal of hydrogen energy 2022-01, Vol.47 (4), p.2234-2244
• Main Authors: Zeng, Junming, Lu, Ke, Zhang, Jie, Sun, Yongkang, Chang, Zhouxin, Li, Jiangwei, Dai, Bin, Yu, Feng, Li, Jiangbing, Liu, Jichang
• Format: Article
• Language: English
• Subjects: CO2 methanation; High dispersion; Highly stable; Low-temperature catalyst; Oxygen vacancies; Solution plasma
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2021.10.183

In this work, the solution plasma-assisted method was used to prepare NiMnAl-LDO (layered double oxides) catalysts with different treatment times, which were used for the CO2 methanation reaction. Solution plasma treatment can enhance the dispersibility of the catalyst, create oxygen defects and improve the chemical adsorption capacity of the catalyst. The results show that the low-temperature activity of the catalyst has been improved after the solution plasma treatment. We demonstrate that the NiMnAl-LDO-P(20) catalyst with high dispersion has the highest catalytic activity in CO2 methanation (81.3% CO2 conversion and 96.7% CH4 selectivity at 200 °C). Even though working for 70 h, the catalyst is still highly stable. This work provides a great promise for improving the low-temperature activity of Ni-based catalysts. [Display omitted] •The NiMnAl-LDO-P(x) catalysts were prepared using solution plasma-assisted method.•The highly dispersed NiMnAl-LDO-P(20) catalyst has excellent low temperature activity.•Solution plasma-assisted preparation can generate oxygen vacancies.•Solution plasma-assisted preparation catalyst exhibits high stability in the low-temperature CO2 methanation.