Cu/β分子筛HC吸附-脱附性能研究

石油炼制与化工 ›› 2025, Vol. 56 ›› Issue (8): 34-41.

Cu/β分子筛HC吸附-脱附性能研究

李洪林¹,李博²,张欣¹,陶志平²,罗一斌²,李菁元¹,闫峰¹,李春¹

1. 中汽研汽车检验中心（天津）有限公司
2. 中石化石油化工科学研究院有限公司

收稿日期:2025-01-13 修回日期:2025-04-03 出版日期:2025-08-12 发布日期:2025-07-28
通讯作者: 张欣 E-mail:zhangxin@catarc.ac.cn
基金资助:
国家能源石油炼制技术研发中心（中国石油化工股份有限公司石油化工科学研究院）开放基金

STUDY ON HC ADSORPTION AND DESORPTION PERFORMANCE OF Cu/β ZEOLITES

Received:2025-01-13 Revised:2025-04-03 Online:2025-08-12 Published:2025-07-28
Supported by:
National Energy R&D Center of Petroleum Refining Technology（RIPP, SINOPEC）

摘要/Abstract

摘要： 以β分子筛为载体，采用金属离子交换法制备了一系列Cu改性β分子筛。通过扫描电子显微镜、X射线衍射和N₂等温吸附-脱附等对水热老化前后的样品进行表征，研究Cu负载量对分子筛的水热结构稳定性、碳氢化合物（HC）吸附-脱附性能和氧化性能的影响规律。结果表明，适量的Cu能够均匀地分散在分子筛中，改性后β分子筛的水热结构稳定性显著增强，C₃H₆吸附量和HC氧化效率提高，同时NH₃吸附量降低；当Cu质量分数达到6.4%时，β分子筛的孔径进一步减小，C₇H₈的吸附量和HC氧化效率降低。在800 ℃下水热老化60 h后，改性分子筛对NH₃，C₃H₆，C₇H₈吸附量可分别达到为0.989，0.337，8.99 mg/g，HC氧化效率为71%，均显著优于水热老化后的H-β分子筛。

关键词: 冷启动, HC 吸附-脱附, β分子筛, Cu改性

Abstract: A series of Cu-modified β zeolites were prepared using the metal ion exchange method with β zeolite as the carrier. The effects of Cu loading on the hydrothermal structural stability, hydrocarbon (HC) adsorption performance, and oxidation performance of HC-trapping zeolites were investigated through characterization techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and N₂ adsorption-desorption isotherms, both before and after hydrothermal aging. The results indicate that an appropriate amount of Cu can be uniformly dispersed within the zeolite. The modified β zeolite exhibits significantly enhanced hydrothermal structural stability, increased C₃H₆ adsorption capacity and HC oxidation efficiency, while NH₂ adsorption capacity decreases. When the Cu mass fraction reaches 6.4%, the pore size of the β zeolite further decreases, leading to reduced C₇H₈adsorption capacity and HC oxidation efficiency. After 60 hours of hydrothermal aging at 800 ℃, the modified zeolite achieves NH₃，C₃H₆, and C₇H₈ adsorption capacities of 0.989, 0.337, and 8.99 mg/g, respectively, with an HC oxidation efficiency of 71%, all of which are significantly superior to those of the hydrothermally aged H-β zeolite.

Key words: cold-start, HC adsorption-desorption, β zeolite, copper-modification

李洪林李博张欣陶志平罗一斌李菁元闫峰李春. Cu/β分子筛HC吸附-脱附性能研究[J]. 石油炼制与化工, 2025, 56(8): 34-41.

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