Role of cobalt on γ-Al2O3 based NO x storage catalyst |
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| Authors: | Park Joo-Hyoung Cho Hyun Ju Park Sang Jun Nam In-Sik Yeo Gwon Koo Kil Jeong Ki Youn Young Kee |
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| Affiliation: | (1) School of Environmental Science and Engineering/Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, Korea;(2) Research & Development Division for Hyundai Motors Company & Kia Motors Corporation, Yongin-Si, Korea |
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| Abstract: | Co/Pt/Ba/γ-Al2O3, Co/Ba/γ-Al2O3, Pt/Ba/γ-Al2O3, Co/Pt/γ-Al2O3, Ba/γ-Al2O3, Pt/γ-Al2O3, and Co/γ-Al2O3 type catalysts were prepared by a conventional impregnation method, and their NO
x
storage capacities were evaluated by colorimetric assay. Co-containing catalysts had a higher NO
x
storage capacity than that of Co-free counterparts. The role of each component, especially Co, for the catalysts prepared
was investigated by using in-situ FTIR. The high NO
x
storage for Co-containing catalysts including Co/Ba/γ-Al2O3 and Co/Pt/Ba/γ-Al2O3 is mainly due to the formation of Co3O4 on the catalyst surface identified by XAFS. |
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| Keywords: | NSR NO x storage capacity Co-containing catalyst in-situ FTIR XAFS |
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