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Received February 22, 2002
Accepted April 8, 2002
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Steam Tolerance of Fe/ZSM-5 Catalyst for the Selective Catalytic Reduction of NOx
1School of Chemical Engineering and Institute of Chemical Processes, Seoul National University, Kwanak-ku, Seoul 151-742, Korea 2Materials Research Team, Hyundai Motor Company, 772-1, Changduk-dong, Whasung-si, Kyunggi-do 445-706, Korea
hkrhee@snu.ac.kr
Korean Journal of Chemical Engineering, July 2002, 19(4), 574-579(6), 10.1007/BF02699298
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Abstract
This article reports the effects of steam on the activity and stability of Fe/ZSM-5 for the selective catalytic reduction of NO with iso-butane. When the feed contained 10% of H2O, the de-NOx activity was maintained if the temperature was above the maximum conversion temperature. However, when the temperature was below the maximum conversion temperature, the catalytic activity decreased. The effect of high temperature steam treatment on the stability was also examined. After the steam treatment, the activity of Fe/ZSM-5 decreased due to the dealumination of ZSM-5 and the migration of Fe ion isolated in the ion exchange site to form ferromagnetic iron agglomerate. The physicochemical properties of the fresh and deactivated catalysts were monitored by ESR, 27Al MAS NMR, XPS, XRD, TPR and FT-IR spectroscopy.
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