화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.93, 461-475, January, 2021
DOI10.1016/j.jiec.2020.10.026  Export Citation
De-NOx characteristics of HC-SCR system employing combined Ag/Al2O3 and CuSn/ZSM-5 catalyst
Kyungseok Lee1, 2, Byungchul Choi1, 3, †, Cheolho Kim4, Chunbeom Lee5, and Kwangchul Oh5
  • 1Automotive Research Center, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
  • 2University Industry Liaison of Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
  • 3School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
  • 4Department of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea
  • 5Korea Automotive Technology Institute, 303, Pungse-ro, Dongnam-gu, Cheonan, Chungnam 31214, Republic of Korea
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The combination of Ag/Al2O3 and CuSn/ZSM-5 on catalytic performance was investigated for selective catalytic reduction of NOx by H2-assisted C3H6. The Ag loading significantly affected the de-NOx performance and C3H6 conversion; a low Ag loading in the catalyst (less than 2 wt% Ag) afforded superior de-NOx performance compared to that obtained with more than 4 wt% Ag, owing to the lack of agglomeration of Ag particles on the support (Ag/Al2O3) in the former. Considering the C3H6 slip, a very high reaction temperature (above 525℃) was required for complete C3H6 oxidation. A combination of Ag/Al2O3 and CuSn/ZSM-5 allowed complete C3H6 oxidation below 350℃ owing to the superior C3H6 oxidation ability of CuSn/ZSM-5, which is the merit of the combined system compared with Ag/Al2O3 or CuSn/ZSM-5 used individually. The best catalytic configuration is the sequential arrangement of 1Ag/Al2O3 + 2Cu1Sn/ZSM-5, which could simultaneously reduce NOx, C3H6, and H2 over a wider temperature window ranging from 300?600℃. Notably, the reduced NOx was almost entirely reduced to N2 with negligible generation of N2O, NH3, and HCNO.
Keywords:NOx reduction;H2-assisted HC-SCR;De-NOx;Ag/Al2O3;CuSn;/ZSM-5;Combination
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