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Received May 22, 2001
Accepted August 8, 2001
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Selective Catalytic Reduction of NOx by Propene over Copper-Exchanged Pillared Clays
Department of Chemical Engineering, Kyungil University, Kyungsan 712-701, Kyungbuk, Korea 1Department of Chemical Engineering/School of Environmental Engineering, POSTECH, Pohang 790-784, Korea
Korean Journal of Chemical Engineering, September 2001, 18(5), 704-710(7), 10.1007/BF02706390
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Abstract
Copper-exchanged pillared clays were examined as an SCR catalyst for NOx removal by propene. Both micropores and mesopores were simultaneously developed by pillaring a bentonite with TiO2. Therefore, TiO2-pillared clay has about 8 to 9 times higher surface area and 3 times higher pore volume than the parent unpillared bentonite. The presence of water in the feed gas stream caused a small and reversible inhibition effect on NO removal activity of Cu/Ti-PILC. The water tolerance of Cu/Ti-PILC was higher than copper-exchanged zeolites such as CuHM and Cu/ZSM-5 due to its high hydrophobicity as confirmed by H2O-TPD experiment. Copper-exchanged PILC was confirmed to be an active catalyst for NOx removal by propene. The addition of copper to TiO2-pillared clay greatly enhanced the catalytic activity for NO removal. Cupric ions on Ti-PILC were active reaction sites for the present reaction system. The state of copper species on the surface of Ti-PILC varied with the content of copper and TiO2. The catalyst having more easily reducible cupric ions showed maximum NO conversion at relatively lower reaction temperatures. It indicates that the redox behavior of cupric ions is directly related to NO removal mechanism. The redox property of cupric ions depended on the copper content and dehydration temperature of PILC.
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References
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Li WB, Sirilumpen M, Yang RT, Appl. Catal. B: Environ., 11(3-4), 347 (1997)
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Yang RT, Tharappiwattananon N, Long RQ, Appl. Catal. B: Environ., 19(3-4), 289 (1998)
