| Title |
Effects of Manganese Precursors on MnOx/TiO2 for Low-Temperature SCR of NOx |
| Authors |
김장훈(Jang Hoon Kim); 신병길(Byeong Kil Shin); 윤상현(Sang Hyeon Yoon); 이희수(Hee Soo Lee); 임형미(Hyung Mi Lim); 정영근(Yong Keun Jeong) |
| DOI |
https://doi.org/10.3365/KJMM.2012.50.3.201 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
porous materials; powder processing; grain growth; raman spectroscopy; catalytic acid-sites |
| 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. |