4.7 Article

HC-SCR system combining Ag/Al2O3 and Pd/Al2O3 catalysts with resistance to hydrothermal aging for simultaneous removal of NO, HC, and CO

Journal

JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 102, Issue -, Pages 51-68

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2021.06.030

Keywords

H-2-assisted C3H6-SCR; Hydrothermal aging; Combined SCR catalyst; Ag/Al2O3; Pd/Al2O3

Funding

  1. Technology Development Pro-gram to Solve Climate Changes through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT [2019M1A2A2104052]
  2. Chonnam National University, Republic of Korea [2019-3904]
  3. National Research Foundation of Korea (NRF) - Min-istry of Education [2020R1I1A1A01074247]
  4. National Research Foundation of Korea [2020R1I1A1A01074247] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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A combined Ag/Al2O3 and Pd/Al2O3 catalyst was found to be effective for the selective catalytic reduction of NOx by H-2-assisted C3H6. The sequential arrangement of 1 wt% Ag/Al2O3 followed by 1Pd/Al2O3 enabled the reduction of NOx, C3H6, CO, and H-2 over wide reaction temperatures, with negligible formation of by-products.
A combined Ag/Al2O3 and Pd/Al2O3 catalyst was investigated for the selective catalytic reduction (SCR) of NOx by H-2-assisted C3H6 in the presence of excessive O-2. The coexistent H-2 significantly lowered the active temperature window of the de-NOx reaction because of the enhanced partial oxidation of C3H6 and NO oxidation to NO2. A low Ag loading of 1 wt% exhibited better de-NOx performance than that attained using 2 wt% Ag. Although Ag/Al2O3 exhibited a high resistance to hydrothermal aging, a high reaction temperature (>500 degrees C) was required to oxidize CO and C3H6 completely. In contrast to Ag/Al2O3, Pd/Al2O3 suppressed C3H6 and CO slip at relatively low temperatures, and a complete oxidation of C3H6 and CO was achieved at 195-275 degrees C and 240-275 degrees C, respectively, under varying SCR conditions and Pd contents (0.5-1.5 wt%); however, 30% de-NOx performance in a narrow temperature window of 210-240 degrees C was attained. The best configuration was found to be a sequential arrangement of 1Ag/Al2O3 followed by 1Pd/Al2O3, which enabled the reduction of NOx, C3H6, CO, and H-2 over wide reaction temperatures, unlike the stand-alone configuration. In this configuration, the reacted NOx was reduced to N-2 with negligible formation of by-products, even after hydrothermal aging. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

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