One-Pot Synthesis of Hexagonal Mesoporous Silica Confined Ni Based Catalysts with Advanced Co2 Methanation Performance

In this work, a series of hexagonal mesoporous silica (HMS) confined Ni based CO2 methanation catalysts were successfully synthesized by the facile one-pot strategy. In the Ni-HMS system, the metal Ni active sites were embedded in the framework of HMS support. Hence, the Ni active sites were highly dispersed and stably confirmed by the HMS framework. The kinetic study demonstrated that the Ni-HMS catalysts behaved much lower apparent activation energy than the 15Ni/HMS and 15Ni/SiO2 supported catalysts, accounting for their enhanced activities at low temperature. Meanwhile, the online TPSR and in-situ DRIFTS of the CO2 methanation were employed to study the reaction intermediates these catalysts. The CHOO-, CHxO-, and COx were the reaction intermediates over the Ni-HMS catalysts and the possible reaction pathways were also posed. In conclusion, the Ni-HMS was considered as a series of efficient and stable catalyst candidates for CO2 methanation.

Keywords: CO2 Utilization, Ni-HMS catalyst, CO2 methanation, One-pot method, Confinement effect.

Suggested Citation: Suggested Citation

Xu, Leilei and Xu, Chunying and Qiu, Jian and Chen, Mindong and Bian, Yufang and Wen, Xueying and Wu, Cai-e and Cheng, Ge and Yang, Bo and Hu, Xun, One-Pot Synthesis of Hexagonal Mesoporous Silica Confined Ni Based Catalysts with Advanced Co2 Methanation Performance. Available at SSRN: https://ssrn.com/abstract=4046913 or http://dx.doi.org/10.2139/ssrn.4046913