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Vol.51, No.1, 57 ~ 63, 2013
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| Title |
| Powder Characteristics and Catalytic Activity of CeO2/TiO2 Catalysts Prepared by the Sol-gel Method for SCR of NOx |
| Min Chul Shin , Jang Hoon Kim , Jin Sun Cha , Byeong Kil Shin , Hee Soo Lee |
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| Abstract |
| CeO2/TiO2 nano powders for the low-temperature selective catalytic reduction (SCR) of NOx prepared by the sol-gel method were characterized by structural, morphological, and physico-chemical techniques. The catalysts based on 10 wt%-CeO2/TiO2 were synthesized using a sol-gel method and their characteristics were compared with the catalyst prepared by the impregnation method. The XRD peaks of all the samples were assigned to a TiO2 phase (anatase). The sample synthesized by the sol-gel method had a very fine particle size and a higher specific surface area than the CeO2/TiO2 catalyst prepared by the impregnation method, 123.4 m2/g and 47.9 m2/g, respectively. The CeO2/TiO2 catalyst made by sol-gel method had stronger catalytic acid sites according to Fourier transform infrared spectroscopy, showing NOx conversion of 80% at 250℃ and 98% at 300℃. The CeO2/TiO2 catalyst prepared by the sol-gel method showed excellent SCR activities and resistance to SO2, even with a relatively small ceria (CeO2) content. |
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| Key Words |
| nanostructured materials, sol-gel, surface, activation analysis, De-NOx SCR catalyst |
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