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Enhancing CO<sub>2</sub> Hydrogenation to Methane by Ni-Based Catalyst with V Species Using 3D-mesoporous KIT-6 as Support
oleh: Hongxia Cao, Wenyuan Wang, Tianlei Cui, Hongyan Wang, Guang Zhu, Xiangkun Ren
Format: | Article |
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Diterbitkan: | MDPI AG 2020-05-01 |
Deskripsi
Using renewable H<sub>2</sub> for CO<sub>2</sub> hydrogenation to methane not only achieves CO<sub>2</sub> utilization, but also mitigates the greenhouse effect. In this work, several Ni-based catalysts with V species using 3D-mesoporous KIT-6 (Korea Advanced Institute of Science and Technology, KIT) as support were prepared at different contents of NiO and V<sub>2</sub>O<sub>5</sub>. Small Ni nanoparticles with high dispersibility on 20Ni-0.5V/KIT-6 were identified by X-ray diffraction (XRD), TEM and hydrogen temperature-programmed desorption (H<sub>2</sub>-TPD) analysis, which promoted the production of more Ni active sites for enhancing catalytic activity for CO<sub>2</sub> methanation. Moreover, TEM and hydrogen temperature-programmed reduction (H<sub>2</sub>-TPR) characterizations confirmed that a proper amount of Ni and V species was favorable to preserve the 3D-mesoporous structure and strengthen the interaction between active Ni and KIT-6. The synergistic effect between Ni and V could strengthen surface basicity to elevate the ability of CO<sub>2</sub> activity on the 20Ni-0.5V/KIT-6. In addition, a strong interaction with the 3D-mesoporous structure allowed active Ni to be firmly anchored onto the catalyst surface, which was accountable for improving catalytic activity and stability. These results revealed that 20Ni-0.5V/KIT-6 was a catalyst with superior catalytic activity and stability, which was considered as a promising candidate for CO<sub>2</sub> hydrogenation to methane.