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http://dx.doi.org/10.7464/ksct.2014.20.2.189

Synthesis Gas Production via Partial Oxidation, CO2 Reforming, and Oxidative CO2 Reforming of CH4 over a Ni/Mg-Al Hydrotalcite-type Catalyst  

Song, Hoon Sub (Department of Chemical Engineering Education, Chungnam National University)
Kwon, Soon Jin (Graduate School of Energy Science and Technology, Chungnam National University)
Epling, William S. (Department of Chemical and Biomolecular Engineering, University of Houston)
Croiset, Eric (Department of Chemical Engineering, University of Waterloo)
Nam, Sung Chan (Greenhouse Gas Department, Korea Institute of Energy Research)
Yi, Kwang Bok (Department of Chemical Engineering Education, Chungnam National University)
Publication Information
Clean Technology / v.20, no.2, 2014 , pp. 189-201 More about this Journal
Abstract
Partial oxidation, $CO_2$ reforming and the oxidative $CO_2$ reforming of $CH_4$ to produce synthesis gas over supported Ni hydrotalcite-type ($Ni_{0.5}Ca_{2.5}Al$ catalyst) catalysts were carried out and the effects of metal supports (i.e.; Mg and Ca) on the formation of a stable double-layer structure on the catalysts were evaluated. The $CH_4$ reforming stability was determined to be affected by the differences in the interaction strength between the active Ni ions and support metal ions. Only a Ni-Mg-Al composition produced a highly stable hydrotalcite-type double-layered structure; while the Ni-Ca-Al-type composition did not. Such structure provides excellent stability for the catalyst (-80% efficiency) as confirmed by the long-term $CO_2$ reforming test (-100 h), while the Ni-Ca-Al catalyst exhibited deactivation phases starting at the beginning of the reaction. The interaction strength between the active metal (Ni) and the supporting components (Mg and Al) was determined by temperature-programed reduction (TPR) analyses. The affinity was also confirmed by the TPR temperature because the Ni-Mg-Al catalyst required a higher temperature to reduce the Ni relative to the Ni-Ca-Al catalyst. The highest initial activity for synthesis gas production was observed for the $Ni_{0.5}Ca_{2.5}Al$ catalyst; however, this activity decreased quickly due to coke formation. The $Ni_{0.5}Ca_{2.5}Al$ catalyst exhibited a high reactivity and was more stable than the other catalysts because it had a higher resistance to coke formation.
Keywords
Methane partial oxidation; $CO_2$ reforming; Oxidative reforming; Hydrotalcite;
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