Enhanced low-temperature performance of CO2 methanation over mesoporous Ni/Al2O3-ZrO2 catalysts
By Jiang-Jen Lin, Caiping Ma, Qiong Wang, Yanfei Xu, G. Ma, Jie Wang, Hongtao Wang, Chenglong Dong, Chenghua Zhang, M. Ding. Applied Catalysis B: Environmental, 2019
252 citations recorded by the source corpus.
Abstract Converting carbon dioxide to value-added chemicals has been attracted much attention, whereas direct hydrogenation of CO2 to synthetic natural gas (SNG) at a lower temperature remains a big challenge. Mesoporous Al2O3-ZrO2 modified Ni catalysts were prepared via a single-step epoxide-driven sol-gel method for CO2 methanation. Almost 100% selectivity of CH4 with 77% CO2 conversion were obtained at a lower temperature of 300 °C, and no catalyst deactivation was observed in 100 h. Different characterization methods including N2 adsorption-desorption, H2-TPR, H2-TPD, XRD, XPS, and TEM were combined together to explore the interaction of Ni-ZrO2 and Al2O3-ZrO2. Incorporation of ZrO2 into Ni/Al2O3 weakened the Ni-Al2O3 interaction via the combination of Al2O3-ZrO2 solid solution, promoting the reduction and dispersion of NiO phase. The adding of higher Zr loading increased the amount of active metallic nickel sites and oxygen vacancies on the composite support, improving obviously the lower temperature catalytic activity and CH4 selectivity. Higher Ni species loading further resulted in the formation of active Ni sites and improved the low-temperature CO2 methanation performance. Moreover, the enhanced stability of the Al2O3-ZrO2 support and oxygen vacancies provided by the ZrO2 promoter could help to promote the catalytic stability.
Subfields: Catalysis, Materials Chemistry, Process Chemistry and Technology
View Paper: https://www.semanticscholar.org/paper/05f68e38a7325335ca8026bd3b74c00d7258461b
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Citations in the corpus
- Isotopic and in situ DRIFTS study of the CO2 methanation mechanism using Ni/CeO2 and Ni/Al2O3 catalysts (2020, background): “In addition, this process contributes to mitigate the emission of CO2 to the atmosphere if the energy used both for H2 production and for acceleration of the Sabatier’s reaction comes from renewable sources [3].”