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Received June 21, 2007
Accepted July 27, 2007
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Deactivation of barium oxide-based NOx storage and reduction catalyst by hydrothermal treatment
School of Applied Chemical Engineering and Center for Functional Nano Fine Chemicals, Chonnam National University, Gwangju 500-757, Korea 1HeeSung Catalysts Corporation, 1251-6 Jungwang-Dong, Shihung, Gyeonggi 429-786, Korea
gseo@chonnam.ac.kr
Korean Journal of Chemical Engineering, March 2008, 25(2), 239-244(6), 10.1007/s11814-008-0043-0
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Abstract
The deactivation of a barium oxide-based NOx storage and reduction (NSR) catalyst with hydrothermal treatment was studied by treating it with 10 vol% water vapor diluted in nitrogen at 850 ℃. XRD, XPS, SEM, IR of CO adsorption, and the N2 adsorption was used to investigate the physical and chemical changes of the NSR catalyst caused by the hydrothermal treatment. The 12 h hydrothermal treatment decreased its NO2 storage capacity by 20%. However, the hydrothermal treatment significantly decreased its ability to reduce the stored NO2. The formation of an inactive phase consisting of platinum and aluminum is believed to be the cause of the severe deactivation of the NSR catalyst.
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