Effect of Co and Rh promoter on NOx storage and reduction over Pt/BaO/Al2O3 catalyst

Jin-Gul Kim; He-Min Lee; Min-Ju Lee; Ju-Heon Lee; Jeong-Gon Kim; Ji-Yong Jeon; Soon-Ki Jeong; Seung-Joon Yoo; Seong-Soo Kim

Journal of Industrial and Engineering Chemistry, Vol.14, No.6, 841-846, November, 2008

DOI10.1016/j.jiec.2008.06.007 Export Citation

Effect of Co and Rh promoter on NOx storage and reduction over Pt/BaO/Al2O3 catalyst

Jin-Gul Kim, He-Min Lee¹, Min-Ju Lee², Ju-Heon Lee³, Jeong-Gon Kim, Ji-Yong Jeon, Soon-Ki Jeong, Seung-Joon Yoo⁴, and Seong-Soo Kim^{5, †}

Dept. of Chemical Eng., Soonchunhyang Univ., Asan 337-745, Republic of Korea
¹Creative Imaging Technology, Inc., Shiwa Industrial Base, Siheung-Si, Republic of Korea
²Research and Development Center, Clean Systems Korea, Inc., Yongin-Si, Republic of Korea
³Engineering Department, Kocat, Seoul, Republic of Korea
⁴Dept. of Env. and Chem. Eng., Seonam Univ., Namwon, 590-711, Republic of Korea
⁵Alternate Fuel Research Center, Korea Institute of Energy Research, Yusongku, Daejon, Republic of Korea

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Effect of cobalt and rhodium promoter on NOx storage and reduction (NSR) kinetics was investigated over Pt/BaO/Al2O3. Kinetics of 2% cobalt loading over Pt/BaO/Al2O3 demonstrated highest NOx uptake during lean cycle, while reduction efficiency during rich cycle appeared most poor. In contrast to this, rhodium showed suppressing effect of NOx uptake during lean cycle and demonstrated an enhanced effect for the higher efficiency of NOx reduction during rich cycle. DRIFT study for NOx uptake and regeneration confirmed formation of surface BaNOx from the band at 1300 cm^(-1) and formation of bulk BaNOx from the band at 1330 cm^(-1).

Keywords:Pt/BaO/Al2O3;Cobalt;Rhodium;NSR;In situ DRIFT;Spillover

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