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Vol.50, No.3, 201 ~ 206, 2012
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| Title |
| Effects of Manganese Precursors on MnOx/TiO2 for Low-Temperature SCR of NOx |
| 김장훈 Jang Hoon Kim , 신병길 Byeong Kil Shin , 윤상현 Sang Hyeon Yoon , 이희수 Hee Soo Lee , 임형미 Hyung Mi Lim , 정영근 Yong Keun Jeong |
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| Abstract |
| The effects of various manganese precursors for the low-temperature selective catalytic reduction (SCR) of NOx were investigated in terms of structural, morphological, and physico-chemical analyses. MnOx/ TiO2 catalysts were prepared from three different precursors, manganese nitrate, manganese acetate(II), and manganese acetate(III), by the sol-gel method. The manganese acetate(III)-MnOx/TiO2 catalyst tended to suppress the phase transition from the anatase structure to the rutile or the brookite after calcination at 500℃ for 2 h. It also had a high specific surface area, which was caused by a smaller particle size and more uniform distribution than the others. The change of catalytic acid sites was confirmed by Raman and FT-IR spectroscopy and the manganese acetate(III)-MnOx/TiO2 had the strongest Lewis acid sites among them. The highest de- NOx efficiency and structural stability were achieved by using the manganese acetate(III) as a precursor, because of its high specific surface area, a large amount of anatase TiO2, and the strong catalytic acidity. |
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| Key Words |
| porous materials, powder processing, grain growth, raman spectroscopy, catalytic acid-sites |
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