当前位置:首页>南京>南京工业大学周荣飞教授团队等Nat. Commun.:超薄沸石膜实现 CO₂高效分离

南京工业大学周荣飞教授团队等Nat. Commun.:超薄沸石膜实现 CO₂高效分离

  • 2026-05-26 16:44:53
南京工业大学周荣飞教授团队等Nat. Commun.:超薄沸石膜实现 CO₂高效分离

No.1

微孔沸石膜是气体分离的理想材料,但传统水热法易产生晶界缺陷、膜厚大、制备周期长,且高品质 8 元环(8-MR)沸石纳米片稀缺,制约其工业化应用。

南京工业大学金万勤教授、周荣飞教授、美国纽约州立大学Miao Yu开发拓扑转化诱导(TCI)新策略,以异质 MFI 沸石纳米片为原料,在商用基底上快速制备超薄、连续的 CHA/MEL 沸石膜,实现 CO₂/CH₄、CO₂/N₂高效分离。相关工作发表在Nature Communications。

实验方法

  • 晶种制备:合成高长径比 MFI 沸石纳米片;

  • 晶种涂覆:浸渍涂覆法在管状氧化铝基底表面制备致密 MFI 纳米片晶种层;

  • TCI 合成:富含结构导向剂(OSDA)的活性凝胶体系中,433K 水热 4–18h,实现 MFI 向 CHA/MEL 拓扑转化,形成超薄连续沸石膜;

  • 后处理:臭氧氛围高温煅烧去除 OSDA;

  • 表征与测试:SEM、STEM、XRD、XPS、MAS NMR、DFT 模拟、气体渗透测试、技术经济分析。

图文详解

图 1 TCI 法制备沸石膜示意图

多孔基底→浸渍涂覆制备二维 MFI 纳米片晶种层→T 合成形成超薄连续沸石膜;绿色为 MFI 纳米片、蓝色为 CHA 晶体、黄色为 OSDA、浅蓝色为凝胶中前驱体;标注 10 元环(10 MR)、8 元环(8 MR)

图 2 TCI 法制备 Si-CHA 膜表征

a、b:18h 合成 Si-CHA 膜表面及截面 SEM 图;c:12h 合成 Si-CHA 膜截面 STEM 图,含局部放大图及选区电子衍射(SEAD)图谱;d:Si-CHA 膜孔隙率分析;e:TCI 法与传统二次生长(CSG)法制备 Si-CHA 膜单气体渗透性能对比

图 3 TCI 法 Si-CHA 沸石形成机制及表征

a:MFI 向 CHA 拓扑转化机制示意图;b:不同合成时间 Si-CHA 膜 ATR/FTIR 光谱;c:膜厚度方向不同深度 XPS 谱;d:MAS NMR 谱;e、f:12h 合成混合沸石 HRTEM 图;g:MFI→CHA 转化及脱水反应吉布斯自由能 DFT 模拟结果

图 4 TCI 法 CHA 膜混合气分离性能

a:干态 CO₂/CH₄混合气中,压力降对 Si-CHA 膜分离性能影响;b:湿热 CO₂/CH₄混合气中 Si-CHA 膜长期稳定性;c:干态 CO₂/CH₄混合气中,TCI 膜与已报道聚合物、MOF、混合基质(MMM)、沸石膜性能对比;d:湿态 CO₂/CH₄混合气中,TCI 膜与已报道沸石膜性能对比;e:胺吸收、传统双级膜、本研究单级膜工艺能耗对比;f:不同 CO₂含量天然气脱碳成本对比

总结

  • 创新策略:首次提出拓扑转化诱导(TCI)法,突破传统沸石膜制备瓶颈,以单一 MFI 纳米片为原料,快速制备超薄、无缺陷 CHA/MEL 沸石膜;

  • 性能突破:Si-CHA 膜 CO₂渗透率达 8800 GPU、CO₂/CH₄选择性超 1000,湿态下性能更优,远超现有沸石 / 聚合物膜;

  • 机制阐明:证实 MFI→CHA 转化遵循经典 + 非经典双路径,S6R 单元水解重组是关键;

  • 应用潜力:技术经济分析显示,该膜可使天然气脱碳成本降低约 87%,为沸石膜工业化提供新路径。

原文链接

https://doi.org/10.1038/s41467-026-72768-z

• end •

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  1. CONNECT:[ UseTime:0.000575s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000816s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002448s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000301s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000609s ]
  6. SELECT * FROM `set` [ RunTime:0.000220s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000535s ]
  8. SELECT * FROM `article` WHERE `id` = 570277 LIMIT 1 [ RunTime:0.000424s ]
  9. UPDATE `article` SET `lasttime` = 1780352793 WHERE `id` = 570277 [ RunTime:0.009154s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002503s ]
  11. SELECT * FROM `article` WHERE `id` < 570277 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000470s ]
  12. SELECT * FROM `article` WHERE `id` > 570277 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003081s ]
  13. SELECT * FROM `article` WHERE `id` < 570277 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000657s ]
  14. SELECT * FROM `article` WHERE `id` < 570277 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002725s ]
  15. SELECT * FROM `article` WHERE `id` < 570277 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003692s ]
0.118059s