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Received March 18, 2005
Accepted June 24, 2005
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Pt-V2O5-WO3/TiO2 Catalysts Supported on SiC Filter for NO Reduction at Low Temperature
Department of Chemical and Biological Engineering/ERI, Gyeongsang National University, 900 Gazwa-Dong, Jinju 660-701, Korea 1School of Chemical Engineering and Industrial Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia
jhchoi@gsnu.ac.kr
Korean Journal of Chemical Engineering, November 2005, 22(6), 844-851(8), 10.1007/BF02705663
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Abstract
The catalytic filter, V2O5-WO3-TiO2 supported on a ceramic filter, is known as a promising material for treating particulates and NOx simultaneously at optimum temperatures around 320 ℃. In order to improve its catalytic activity at low temperatures, the effect of Pt addition on the catalytic filter has been investigated. Catalytic filters, Pt-V2O5-WO3-TiO2 /SiC, were prepared by co-impregnation of Pt, V, and W precursors on TiO2 coated-SiC filter by vacuum aided-dip coating. The Pt-added catalytic filter shifted the optimum working temperature from 280-330 ℃ (for the non Pt-impregnated filter) to 180-230 ℃, providing Nx slip concentration less than 20 ppm for the treatment of 700 ppm NO at a face velocity of 2 cm/s with the same value over the non Pt-added catalytic filters. The promotional effect following the addition of Pt is believed to result from electrical modification of the catalyst maintaining a high electron transfer state. Ammonia oxidation was also observed to be dominant above the optimal temperature for SCR.
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Nam IS, Catalysis, 11(1), 5 (1995)
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Pena DA, Uphade BS, Smirniotis PG, J. Catal., 221(2), 421 (2004)
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Praserthdam P, Chaisuk C, Mongkhonsi T, Korean J. Chem. Eng., 20(1), 32 (2003)
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Sanchez E, Lopez T, Mater. Lett., 25, 271 (1995)
Saracco G, Montanaro L, Ind. Eng. Chem. Res., 34(4), 1471 (1995)
Schulz K, Durst M, "Advantages of an Integrated System for Hot Gas Filtration using Rigid Ceramic Elements", Filtration & Separation, January/February, 25 (1994)
Shin BS, Lim SY, Choung SJ, Korean J. Chem. Eng., 11(4), 254 (1994)
Siemon U, Bahnemann D, Testa JJ, Rodriguez D, Litter MI, Bruno N, J. Photochem. Photobiol. A-Chem., 148, 247 (2002)
Suarez S, Jung SM, Avila P, Grange P, Blanco J, Catal. Today, 75(1-4), 331 (2002)
Sobczyk DP, van Grondelle J, Thune PC, Kieft IE, de Jong AM, van Santen RA, J. Catal., 225(2), 466 (2004)
Sohn JR, Bae JH, Korean J. Chem. Eng., 17(1), 86 (2000)
Taguchi J, Okuhara T, Appl. Catal. A: Gen., 194-195, 89 (2000)
U.S. Department of Energy, Clean Coal Today, DOE/FE-0215P-53 Issue No. 53, Spring (2003)
U.S. Department of Energy, Clean Coal Today, DOE/FE-0215P-54 Issue No. 54, Summer (2003)
van den Broek ACM, van Grondelle J, van Santen RA, J. Catal., 185(2), 297 (1999)
Zhu ZP, Liu ZY, Niu HX, Liu SJ, J. Catal., 187(1), 245 (1999)
