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http://dx.doi.org/10.7464/ksct.2018.24.3.198

Effect of the Preparation Method on the Activity of CeO2-promoted Co3O4 Catalysts for N2O Decomposition  

Kim, Hye Jeong (Graduate School of Energy Science and Technology Chungnam National University)
Kim, Min-Jae (Department of Chemical and Biological Engineering, Korea University)
Lee, Seung-Jae (Korea Institute of Energy Research)
Ryu, In-Soo (Korea Institute of Energy Research)
Yi, Kwang Bok (Graduate School of Energy Science and Technology Chungnam National University)
Jeon, Sang Goo (Korea Institute of Energy Research)
Publication Information
Clean Technology / v.24, no.3, 2018 , pp. 198-205 More about this Journal
Abstract
This study investigated the influence of catalyst preparation on the activity of $Co-CeO_2$ catalyst for $N_2O$ decomposition. $Co-CeO_2$ catalysts were synthesized by co-precipitation and incipient wetness impregnation. In order to estimate the performance of the as prepared catalysts, direct catalytic $N_2O$ decomposition test was carried out under $250{\sim}375^{\circ}C$. As a result, the catalyst prepared by co-precipitation (CoCe-CP) showed an enhanced performance on $N_2O$ decomposition reaction even in the presence of $O_2$ and/or $H_2O$, whereas the impregnation catalyst (CoCe-IM) did not. In order to investigate the difference in catalytic activity, characterization such as XRD, BET, TEM, $H_2-TPR$, $O_2-TPD$, and XPS was conducted. It is confirmed that the particle size and specific surface area were changed depending on the catalyst preparation method and the synthesis process influenced the physical properties of the catalysts. In addition, the improvement in the activity of the catalyst prepared by co-precipitation is due to the enhanced reduction from $Co^{3+}$ to $Co^{2+}$ and the improved oxygen desorption rate. However, it has been confirmed that the surface electron state and binding energy, which are related to $N_2O$ decomposition, do not change depending on the preparation method.
Keywords
$N_2O$ decomposition; Catalyst; Cobalt oxide; Cerium oxide; Impregnation; $Co_3O_4$; $CeO_2$;
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