V/TiO2 촉매의 선택적 촉매 환원 반응특성 연구

이상진; 홍성창; Sang-Jin Lee; Sung-Chang Hong

Journal of the Korean Industrial and Engineering Chemistry, Vol.19, No.5, 512-518, October, 2008

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V/TiO2 촉매의 선택적 촉매 환원 반응특성 연구

Characterization of V/TiO2 Catalysts for Selective Reduction

이상진, 홍성창 ^†

경기대학교 환경공학과, 경기도 442-760

Sang-Jin Lee, and Sung-Chang Hong^†

Department of Environmental Engineering, Kyonggi University, Gyeonggi-do 442-760, Korea

E-mail:

초록

고정원에서 발생되는 질소산화물을 V/TiO2 촉매하에서 암모니아를 이용하여 질소로 제거하는 선택적 촉매 환원법에 대하여 연구하였다. 이러한 SCR 공정은 촉매의 성능이 전체 공정의 성능을 좌우한다. 본 연구에서는 V/TiO2 촉매들의 저온 및 고온에서의 SCR 반응 특성을 조사하고 촉매상에서의 암모니아 거동을 통한 반응물의 흡.탈착 특성을 파악하였다. 실험은 고정층 반응기에서 수행하였으며, 촉매는 7종의 TiO2에 동일한 양의 바나듐을 담지하였다. 실험결과 각각의 TiO2와 바나듐간의 상호작용에 의해 비화학양론적인 바나듐 산화물들이 다르게 생성되기 때문에 TiO2에 따라 다양한 반응활성을 나타내는 것을 확인하였다. 또한 각 촉매에 대하여 각각 최적의 소성온도가 존재하였으며 촉매의 활성도 각각 다르게 나타 났다. 또한 촉매의 NH3-TPD 실험 결과 SCR 활성과 흡착된 NH3의 양과는 직접적으로 일치하지 않았다.

The present work studied the selective catalytic reduction (SCR) of NO to N2 by NH3 over V/TiO2 focusing on NOx control for the stationary sources. The SCR process depends mainly on the catalyst performance. The reaction characteristics of SCR with V/TiO2 catalysts were closely examined at low and high temperature. In addition, adsorption and desorption characteristics of the reactants on the catalyst surface were investigated with ammonia. Seven different TiO2 supports containing the same loading of vanadia were packed in a fixed bed reactor respectively. The interaction between TiO2 and vanadia would form various non-stoichiometric vanadium oxides, and showed different reaction activities. There were optimum calcination temperatures for each samples, indicating different reactivity. It was finally found from the NH3-TPD test that the SCR activity was nothing to do with NH3 adsorption amount.

Keywords:SCR;calcination;NH3-TPD;catalyst

[References]

Lee JY, Ph. D. Dissertation, Korea University, Seoul, Korea (2001)
Lietti L, Alemany JL, Forzatti P, Busca G, Ramis G, Giamello E, Bregani F, Catal. Today, 29(1-4), 143 (1996)
Rajadhayaksha RA, Knozinger H, Appl. Catal., 51, 81 (1989)
Il’chenko NI, Golodets GS, J. Catal., 39, 57 (1975)
Il’chenko NI, Golodets GS, J. Catal., 39, 73 (1975)
Bosch H, Jansse F, Catal. Today, 2, 369 (1988)
Kamata H, Takahashi K, Odenbrand CUI, J. Mol. Catal. A-Chem., 139, 189 (1999)
Miyamoto A, Kobayashi K, Inomata M, Murakami Y, J. Phys. Chem., 86, 2945 (1982)
Sharma VK, Wokaun A, Baiker A, J. Phys. Chem., 90, 2715 (1986)
Lee YG, Thesis MS, Pohang University of Science & Technology, Pohang, Korea (1999)
Moon SH, Ph. D. Dissertation, Seoul National University, Seoul, Korea (1996)
Pae YI, Doh IJ, Park EH, Sohn JR, J. Korean Ind. Eng. Chem., 6(5), 849 (1995)
Cristallo G, Roncari E, Rinaldo A, Trifiro F, Appl. Catal. A: Gen., 209(1-2), 249 (2001)
Amores JMG, Escribano VS, Ramis G, Busca G, Appl. Catal., 13, 45 (1997)

[Related Articles]

[1] Lee JY, Ph. D. Dissertation, Korea University, Seoul, Korea (2001)

[2] Lietti L, Alemany JL, Forzatti P, Busca G, Ramis G, Giamello E, Bregani F, Catal. Today, 29(1-4), 143 (1996)

[3] Rajadhayaksha RA, Knozinger H, Appl. Catal., 51, 81 (1989)

[4] Il’chenko NI, Golodets GS, J. Catal., 39, 57 (1975)

[5] Il’chenko NI, Golodets GS, J. Catal., 39, 73 (1975)

[6] Bosch H, Jansse F, Catal. Today, 2, 369 (1988)

[7] Kamata H, Takahashi K, Odenbrand CUI, J. Mol. Catal. A-Chem., 139, 189 (1999)

[8] Miyamoto A, Kobayashi K, Inomata M, Murakami Y, J. Phys. Chem., 86, 2945 (1982)

[9] Sharma VK, Wokaun A, Baiker A, J. Phys. Chem., 90, 2715 (1986)

[10] Lee YG, Thesis MS, Pohang University of Science & Technology, Pohang, Korea (1999)

[11] Moon SH, Ph. D. Dissertation, Seoul National University, Seoul, Korea (1996)

[12] Pae YI, Doh IJ, Park EH, Sohn JR, J. Korean Ind. Eng. Chem., 6(5), 849 (1995)

[13] Cristallo G, Roncari E, Rinaldo A, Trifiro F, Appl. Catal. A: Gen., 209(1-2), 249 (2001)

[14] Amores JMG, Escribano VS, Ramis G, Busca G, Appl. Catal., 13, 45 (1997)