Tang Xuan, Bai Xiaowei, Wang Yating, Li Xiaomin, Zhang Feifei, Wang Li, Wang Xiaoqing, Li Jinping, Yang Jiangfeng
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, PR China.
Shanxi Research Institute of Huairou Laboratory, Taiyuan, Shanxi, PR China.
Nat Commun. 2025 Aug 28;16(1):8065. doi: 10.1038/s41467-025-63537-5.
Achieving low-energy and high-efficiency sieving of nitrogen rejection from methane in natural gas purification processes requires precise control of material pore size with a resolution of 0.1-0.2 Å, which is highly challenging. Here, we report a novel adsorbent (MOR-Cu), a mordenite with copper introduced in situ via high-temperature crystallization, enabling precise sieving of nitrogen and methane by the appropriate pore size and pore geometry. Refinement of the crystal structure shows that the higher crystallization temperature changes the position of the copper component, increasing pore volume and enhancing nitrogen adsorption capacity and kinetics. MOR-Cu-210 obtained by crystallization at 210 °C exhibits a record nitrogen adsorption capacity (0.74 mmol g) and nitrogen/methane uptake ratio (62.1) at 298 K and 1 bar, breaking the bottleneck of adsorption capacity and selectivity. Cyclic gas adsorption tests and column breakthrough experiments confirm high separation performance and stable recyclability.
在天然气净化过程中，要实现从甲烷中高效低能耗地筛分脱除氮气，需要将材料孔径精确控制在0.1 - 0.2 Å的分辨率，这极具挑战性。在此，我们报道了一种新型吸附剂（MOR-Cu），即通过高温晶化原位引入铜的丝光沸石，其合适的孔径和孔道几何形状能够实现氮气和甲烷的精确筛分。晶体结构的细化表明，较高的晶化温度改变了铜组分的位置，增加了孔体积，提高了氮气吸附容量和吸附动力学。在210 °C下晶化得到的MOR-Cu-210在298 K和1 bar下表现出创纪录的氮气吸附容量（0.74 mmol g）和氮气/甲烷吸附量比（62.1），突破了吸附容量和选择性的瓶颈。循环气体吸附测试和柱穿透实验证实了其高分离性能和稳定的可回收性。
