Morphology dependence of catalytic properties of Ni/CeO2 for CO2 methanation: A kinetic and mechanism study
By Zhoufeng Bian, Y. M. Chan, Yang Yu, S. Kawi. Catalysis Today, 2020
168 citations recorded by the source corpus.
Abstract Ceria has been used for catalyst support for long time due to its unique structural properties resulting from oxygen vacancies and reversible valence change (Ce4+ and Ce3+). In this report, ceria nanorods (NR) and nanocubs (NC) were prepared with hydrothermal method and 5 wt% nickel was loaded on it. The effect of morphology of ceria supports for CO2 methanation reaction was studied. Characterization including TPR, TEM, XRD and XPS shows that Ni/CeO2-NR had a higher number of Ce3+ proportion compared with Ni/CeO2-NC. Both catalysts showed high conversion and selectivity for methane at low temperature range at200–250 °C and interestingly Ni/CeO2-NR exhibited a higher activity than Ni/CeO2–NC. A kinetic study and DRIFTs investigation were carried out to formulate the mechanism. It turned out that CO2 methanation on Ni/CeO2 goes through a formate route instead of CO2 dissociation and the oxygen vacant sites are supposed to be the active sites for the formate formation in this mechanism.
Subfields: Catalysis, Materials Chemistry, Process Chemistry and Technology
View Paper: https://www.semanticscholar.org/paper/1c2f5109f1451da20fc83f2285d6ca589289e7ee
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In Materials Chemistry
Citations in the corpus
- CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides (2020, background): “Thus, several supports including Al2O3 [5,9,23,25], SiO2 [13,14,26], TiO2 [13,25,27], ZrO2 [9,28,29] and CeO2 [13,17,26,30] have been studied to improve the activity and long-time stability of Ni-based catalysts.”