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Vol.49, No.8, 596 ~ 601, 2011
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| Title |
| Preparation and Thermal Degradation Behavior of WO3-TiO2 Catalyst for Selective Catalytic Reduction of NOx |
| 신병길 Byeong Kil Shin , 김장훈 Jang Hoon Kim , 윤상현 Sang Hyeon Yoon , 이희수 Hee Soo Lee , 신동우 Dong Woo Shin , 민화식 Wha Sik Min |
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| Abstract |
| Thermal degradation behavior of a WO3-TiO2 monolithic catalyst was investigated in terms of structural, morphological, and physico-chemical analyses. The catalyst with 4 wt.% WO3 contents were prepared by a wet-impregnation method, and a durability test of the catalysts were performed in a temperature range between 400℃ and 800℃ for 3 h. An increase of thermal stress decreased the specific surface area, which was caused by grain growth and agglomeration of the catalyst particles. The phase transition from anatase to rutile occurred at around 800℃ and a decrease in the Brønsted acid sites was confirmed by structural analysis and physico-chemical analysis. A change in Brønsted acidity can affect to the catalytic efficiency; therefore, the thermal degradation behavior of the WO3-TiO2 catalyst could be explained by the transition to a stable rutile phase of TiO2 and the decrease of specific surface area in the SCR catalyst. |
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| Key Words |
| porous materials, powder processing, grain growth, raman spectroscopy, catalytic acid-site |
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