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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 10, 2022
Revised February 8, 2023
Accepted February 9, 2023

Acknowledgements: This work is supported by Hyundai Motor Company, National Research Foundation of Korea (NRF) Grant funded by the Korean government (MSIT) (No. 2021R1C1C1005404 and No. 2021R1 A5A1028138), GIST Research Institute (GRI) grant funded by the GIST in 2023.

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Pt substitution in Pd/Rh three-way catalyst for improved emission control

Do Yeong Kim^1† Wo Bin Bae^1† Sang Woo Byun¹ Young Jin Kim² Dal Young Yoon³ Changho Jung³ Chang Hwan Kim³ Dohyung Kang^4† Melanie J. Hazlett^5† Sung Bong Kang^1†

¹Research Center for Innovative Energy and Carbon Optimized Synthesis for Chemicals (Inn-ECOSysChem) and School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Gwangju 61005, Korea ²Center for Environment & Sustainable Resources, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Daejeon 34114, Korea ³Energy & Environmental Chemical Systems Lab, IFAT (Institute of Fundamental & Advanced Technology), R&D Division, Hyundai Motor Company, 37, Cheoldobagmulgwan-ro, Uiwang-si, Gyeonggi-do 16082, Korea ⁴Department of Future Energy Convergence, Seoul National University of Science and Technology, 232 Gongreung-ro, Nowon-gu, Seoul 01811, Kore ⁵Chemical and Materials Engineering, Gina Cody School of Engineering and Computer Science, Concordia University, Montreal, QC, H4B1R6, Canada

dkang@seoultech.ac.kr, melanie.hazlett@concordia.ca, sbkang@gist.ac.kr

Korean Journal of Chemical Engineering, July 2023, 40(7), 1606-1615(10), 10.1007/s11814-023-1441-z

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Abstract

Gasoline engine vehicle emissions, such as nitrogen oxides (NOx), CO and hydrocarbons (HCs), are a major source of air pollution, and require improved emission control systems. By-product NH3 and N2O emissions, which come from low N2 selectivity in the emission control system, are also a major concern. The current study has comprehensively investigated the impact of the Pt-substitution in commercial Pd/Rh-based three-way catalyst (TWC) formulations with respect to catalytic performance. TWC performance was systematically evaluated with respect to the warm-up catalytic converter (WCC) and the under-floor catalytic converter (UCC). This included evaluating TWC activity under realistic simulated exhaust conditions including fuel-rich, stoichiometric and fuel-lean (0.991.01). Ptsubstituted TWCs outperformed Pd-based counterparts, regardless of the converter type (WCC or UCC), in CO, C3H6 and C3H8 oxidation and NO reduction reactions under the simulated exhaust conditions tested. Moreover, Pt-substituted TWCs exhibited significant stability upon hydrothermal aging at 1,050 o C. The results show that after aging the Pt-substituted catalyst retained higher N2 selectivity than the Pd-based TWC. Over Pd-based TWCs, N2 selectivity drastically dropped from 70-80% to 15-35% after aging, while Pt-substituted TWCs N2 selectivity dropped from 80- 100% to only 60-80%. The key finding from this study is that Pt incorporation in a Pd/Rh TWC improves the emission control from gasoline vehicles in terms of both CO and HC oxidation and NOx reduction

Keywords

Three-Way Catalyst Pt Substitution Realistic Exhaust Gas Condition Aging Effect Emission Contro

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