| Effect on NOx and CO Reduction Performance According to the Support and the Precious Metals Used When NH3 is Supplied to H2-SCR |
| Choong-kil Seo |
| Department of Automotive & Mechanical Engineering, Howon University, 64, Howondae 3-Gil, Impi-Myeon, Gunsan-si 54058, Jeollabuk-do, Korea |
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Received: November 13, 2024; Revised: December 19, 2024 Accepted: December 20, 2024. Published online: February 1, 2025. |
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| ABSTRACT |
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Hydrogen energy is a carbon-free energy source and its utilization is increasing. In Korea, the proportion of internal combustion engines is still high, and research on H2-SCR, a post-treatment catalyst to reduce NOx, one of the exhaust gases, is being conducted. This study aims to investigate the performance of harmful gases reduction according to the type of support and the precious metal used when NH3 was supplied to the H2-SCR. In the H2-TPR experiment. SEM–EDX, TEM, BET, and H2-TPR analyses were performed depending on the type of support and the precious metal of H2-SCR. The 0.75Pt–0.75Pd/TiO2 (H2 + NH3) H2-SCR showed the NOx conversion of about 61% at 100 °C, and from 2% to 22% NOx conversion was improved at the entire catalyst temperature. When NH3 was supplied to the H2-SCR catalyst, the support of TiO2, which has a high oxidation and reduction ability, had better low-temperature activity than the Al2O3 support. The activity of the Pd-loaded H2-SCR was lower compared to that of the Pt-loaded H2-SCR. In future studies, research will be conducted on the catalyst manufacturing method and the NH3/NOx supply ratios, to improve the harmful gas reduction performance of the H2-SCR catalyst. |
| Key Words:
Catalyst · Nitrogen oxide · Selective catalytic reduction · Carbon monoxide · NH3 |
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Corresponding Author.
Choong-kil Seo , Email. 
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