A durable Cu-beta zeolite via simple yet controlled pre-removal of framework Al for hydrocarbon trapping
- Authors
- Zeng, Wenhao; Shim, Jaehee; Li, Jiajia; Kim, Jinseong; Baik, Hionsuck; Li, Liangqing; Lee, Kwan-Young; Choi, Jungkyu
- Issue Date
- 2025-12
- Publisher
- Pergamon Press Ltd.
- Citation
- Separation and Purification Technology, v.378, no.Part 3
- Abstract
- The development of robust, high-performance hydrocarbon (HC) trapping materials that can withstand harsh hydrothermal treatment (HT) at temperatures >= 800 degrees C remains a great challenge. In this study, to the best of our knowledge, we, for the first time, delicately removed framework Al from the BEA zeolite support (Si/Al ratio of ca. 18.1) using acids of varying strength and concentration prior to Cu impregnation. Use of moderately dealuminated BEA zeolites (Si/Al ratio: ca. 25-35) for Cu impregnation allowed for forming a sufficient amount of the active Cu species (both Cu+ ions inside for preferred HC adsorption and tiny CuO particles outside for effective HC oxidation). More importantly, the Cu-impregnated ones preserved these active Cu species as well as the original zeolite structure after HT. These features led to both excellent cold-start test (a simplified trap test for simulated HC emissions) activity and hydrothermal stability as desired for HC traps. In particular, the Cuimpregnated BEA zeolite with optimal pre-dealumination (treated with a 0.1 M oxalic acid solution) showed unprecedentedly marked HC removal ability (11.3 % of total HC removal efficiency vs. 0 % for the parent BEA zeolite-based counterpart) even after very harsh HT at 850 degrees C, bringing the HC traps closer to real-world applications.
- Keywords
- SELECTIVE CATALYTIC-REDUCTION; PHYSICOCHEMICAL PROPERTIES; HYDROTHERMAL STABILITY; AUTOMOTIVE CATALYSIS; CU-SSZ-13 CATALYST; THERMAL-STABILITY; NH3-SCR REACTION; DEALUMINATION; NOX; ACID; Acid-assisted dealumination; Cu-impregnated BEA zeolites; Hydrothermal stability; Hydrocarbon trap; Cold-start test; Acid-assisted dealumination; Cu-impregnated BEA zeolites; Hydrothermal stability; Hydrocarbon trap; Cold-start test
- ISSN
- 1383-5866
- URI
- https://pubs.kist.re.kr/handle/201004/153282
- DOI
- 10.1016/j.seppur.2025.134802
- Appears in Collections:
- KIST Article > Others
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.