Effect of supports on the performance of Co-based catalysts in methane dry reforming

A balance between the rates of carbon deposition and surface oxidation of CoAl/MgAl2O4 improves both catalytic activity and stability. [Display omitted] •Effects of nature of supports on the catalytic property of CoAl catalyst was investigated.•CoAl/MgAl2O4 exhibited both good catalytic activity and...

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Bibliographic Details
Published in:Journal of CO2 utilization 2018-07, Vol.26, p.465-475
Main Authors: Park, Jung-Hyun, Yeo, Suyeon, Chang, Tae-Sun
Format: Article
Language:English
Subjects:
Carbon deposition
Cobalt catalyst
Methane dry reforming
Stability
Support effect
Surface oxidation
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Summary:A balance between the rates of carbon deposition and surface oxidation of CoAl/MgAl2O4 improves both catalytic activity and stability. [Display omitted] •Effects of nature of supports on the catalytic property of CoAl catalyst was investigated.•CoAl/MgAl2O4 exhibited both good catalytic activity and stability.•Co species interact well with MgAl2O4 due proximity in ionic radii of Co and Mg.•The balance between the rates of carbon deposition and surface oxidation is crucial. The effect of different supports (Al2O3, CeO2, MgAl2O4, SiO2, and ZrO2) on the catalytic performance of an aluminum-incorporated cobalt catalyst in the dry reforming of methane (DRM) was investigated. DRM observations revealed the highest CH4 and CO2 conversion levels with CoAl/MgAl2O4. These levels decreased in the order: CoAl/MgAl2O4 > CoAl/Al2O3 > CoAl/ZrO2 > CoAl/CeO2 > CoAl/SiO2. Due to the proximity of the Co and Mg ionic radii, the cobalt species strongly interacted with MgAl2O4 resulting in the formation of a solid solution. The CH4/CO2 thermogravimetric results indicated that the performance of the CoAl/MgAl2O4 catalyst was superior to that of the other catalysts. This was attributed to the balance between the rates of carbon deposition from CH4 decomposition and surface oxidation from CO2 dissociation. In addition, the apparent activation energy on this catalyst (54.6 kJ/mol) was much lower than that of CoAl/Al2O3 (77.5 kJ/mol), indicating a marked improvement in CH4 reforming activity for CoAl/MgAl2O4. Overall, the characterization results revealed that the catalytic performance was influenced by the synergistic effect between CoAl and its support.
ISSN:2212-9820
2212-9839
DOI:10.1016/j.jcou.2018.06.002