2026-10-12T06:24:00Z https://www.scidb.cn/oai

10.57760/sciencedb.00zrr 2026-08-18T11:32:25Z

2026-08-18 Structural Characteristics and Catalytic Performance of Nanosheet-Like Small-Crystal Y Zeolite doi:10.57760/sciencedb.00zrr en This paper presents a comparative study on the structural and thermal stability differences between a nanosheet-like small-crystal Y zeolite (NaY-Ur) and a conventional small-crystal Y zeolite (NaY-Con), and further investigates the acidity and catalytic cracking performance of the corresponding ultrastable Y zeolite (USY) samples obtained after hydrothermal ultrastabilization. Compared with the conventional NaY (~350 nm), NaY-Ur exhibits a reduced crystal size of ~221 nm and an average nanosheet thickness of ~83 nm. After calcination at 850 °C, NaY-Ur retains a significantly higher XRD relative crystallinity (31%) and BET surface area retention (11.0%) than those of NaY-Con (23% and 4.7%, respectively), demonstrating a synergistic thermal stability advantage in both crystal structure and pore structure. XRD, XRF, EDS, and OH-IR analyses reveal that NaY-Ur possesses a higher framework SiO2/Al2O3 ratio and a surface Si-enrichment feature, providing the structural basis for its superior thermal stability over NaY-Con. Benefiting from these structural advantages, NaY-Ur after hydrothermal ultrastabilization develops more favorable textural and acidic properties: the resulting USY-Ur exhibits a more concentrated mesopore distribution, enhanced mesopore interconnection, and a higher proportion of strong Brønsted acid sites. In the catalytic cracking of n-octane, USY-Ur achieves an initial conversion of 59.2%, outperforming USY-Con (50.2%), along with increased yields of light olefins and iso-alkanes. These results illustrate a structure–performance relationship between structural characteristics and catalytic performance, offering new insights for the structural design of high-performance Y zeolites. Y zeolite; nanosheet-like small crystal; thermal stability; acidity; catalytic cracking Xia Tian Zhao Hongjuan Li Rui Wang Jiujiang Liu Huangfei Zeng Penghui Ren Shenyong Liu Honghai Gao Xionghou Xu Chunming Shen Baojian PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset http://www.doi.org/10.3724/j.issn1001-3555.2026.04.004 Science Data Bank