| Title |
Powder Characteristics and Catalytic Activity of CeO2/TiO2 Catalysts Prepared by the Sol-gel Method for SCR of NOx |
| Authors |
(Min Chul Shin); (Jang Hoon Kim); (Jin Sun Cha); (Byeong Kil Shin); (Hee Soo Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2013.51.1.057 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
nanostructured materials; sol-gel; surface; activation analysis; De-NOx SCR catalyst |
| 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. |