| 학회 |
한국공업화학회 |
| 학술대회 |
2021년 가을 (11/03 ~ 11/05, 대구 엑스코(EXCO)) |
| 권호 |
25권 2호 |
| 발표분야 |
포스터-촉매 |
| 제목 |
Comparative study of the mobility of Pd species in SSZ-13 and ZSM-5, and its implication for their activity as passive NOx Adsorbers (PNAs) after hydro-thermal aging |
| 초록 |
The comparative behavior of Pd species in ZSM-5 and SSZ-13 zeolite supports resulting from thermal treatment in the presence and absence of water was studied. Thermal treatment at 750 °C induced the atomic distribution of Pd species in ZSM-5, while clustered Pd species remained in SSZ-13. The addition of water during thermal treatment resulted in the Pd sintering in the Pd/ZSM-5 catalyst, although Pd dispersion and agglomeration were concurrently observed in the Pd/SSZ-13 catalyst. Catalysts were vacuum-treated to induce the auto-reduction of the atomic Pd species. The isolated Pd species in ZSM-5 were completely reduced to form large Pd clusters, while most of the Pd species in SSZ-13 remained atomically dispersed. It is likely that the smaller pore size of SSZ-13 than ZSM-5 contributed to the lesser Pd mobility in the former. The hydrothermal treatment deactivated the NO adsorption ability of other prepared Pd/zeolite catalysts with larger pore openings. |
| 저자 |
이재하, 이은원, 유영석, 황성하, 김용우, 김도희
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| 소속 |
서울대 |
| 키워드 |
zeolite; passive NOx adsorbers(PNAs); Pd mobility; hydrothermal treatment
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| E-Mail |
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