Deactivation of barium oxide-based NOx storage and reduction catalyst by hydrothermal treatment

Ji Won Park; Se Min Park; Young San Yoo; Hyun-Sik Han; Gon Seo

Korean Journal of Chemical Engineering, Vol.25, No.2, 239-244, March, 2008

DOI10.1007/s11814-008-0043-0 Export Citation

Deactivation of barium oxide-based NOx storage and reduction catalyst by hydrothermal treatment

Ji Won Park, Se Min Park, Young San Yoo¹, Hyun-Sik Han¹, and Gon Seo^†

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

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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.

Keywords:NOx Storage and Reduction (NSR);Barium Oxide;Deactivation;Hydrothermal Treatment

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