Abstract
Using renewable H2 for CO2 hydrogenation to methane not only achieves CO2 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 V2O5. 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 (H2-TPD) analysis, which promoted the production of more Ni active sites for enhancing catalytic activity for CO2 methanation. Moreover, TEM and hydrogen temperature-programmed reduction (H2-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 CO2 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 CO2 hydrogenation to methane.
Highlights
In the recent decades, the amount of CO2 in the atmosphere rose rapidly due to the ongoing consumption of carbon-based fuels, including coal, petroleum and natural gas, which are regarded as the leading reasons for the greenhouse effect [1,2,3,4]
The decreased CH4 selectivity was ascribed to increasing the temperature, CH4 selectivity of 10Ni/KIT-6 exhibited an upward trend with a the occurrence of a methane steam reforming reaction, which was promoted at high temperatures [41]
KIT-6 were synthesized for the production of CH4
Summary
The amount of CO2 in the atmosphere rose rapidly due to the ongoing consumption of carbon-based fuels, including coal, petroleum and natural gas, which are regarded as the leading reasons for the greenhouse effect [1,2,3,4]. In recent years, using a mesoporous Si molecular sieve as support is regarded as an effective way to enhance Ni dispersion, anti-sintering and carbon-resistance, because they possess a large specific surface area, adjustable pore size and high hydrothermal stability [27]. Li et al [32] revealed that, in V-containing catalysts, an intimate contact between active Ni and the support greatly influenced the dispersion of active phase on the support Based on these promising results, it was concluded that catalytic CO2 methanation can be significantly enhanced by the improvement of the catalytic structure and Ni dispersion using a mesoporous Si molecular sieve as support and adding V species as promoter. A 60h-lifetime test was performed to investigate the catalytic stability
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