High hydrogen permselective carbon molecular sieve membrane and its structural formation mechanism
High hydrogen permselective carbon molecular sieve membrane and its structural formation mechanism
复制标题
高选择性氢渗透碳分子筛膜及其结构形成机制
DOI：
10.1016/j.carbon.2023.01.035
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发表时间：
2023-03
期刊：
影响因子：
10.9
通讯作者：
Mengjie Hou;Lin Li;Zilong He;R. Xu;Yunhua Lu;Tonghua Wang
中科院分区：
文献类型：
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作者：
Mengjie Hou;Lin Li;Zilong He;R. Xu;Yunhua Lu;Tonghua Wang
A novel hydroxyl-containing polyetherimide (named BAHPPF-ODPA) with highly aromatic backbone and contorted chain conformation was designed and synthesized as the precursor to fabricate carbon molecular sieve membranes (CMSMs) for H2/N2separation. The structural evolution from polymeric precursor to carbon during pyrolysis was investigated using characterization techniques combined with pyrolysis simulation. And the relationship between membrane structure formation and their separation performance was explored here. Results indicate that the generation and evolution of pyrolysis products including formed fragments and gases, which depend on the precursor chemistry and pyrolysis conditions, exhibited a significant influence on microstructure and performance of derived CMSMs. Designing precursors with an aromatic backbone and contorted structure and precisely tuning pyrolysis temperature allows the fabrication of CMSMs with controllable micropore structure and excellent H2separation performance. The BAHPPF-ODPA derived CMSM pyrolyzed at 600 °C exhibited the high H2permeability of about 3500 Barrer and the superior H2/N2selectivity of more than 400 were obtained after 750 h of long-term mixed gas (75:25 mixture of H2/N2) testing, showing promising application prospects. The experimental and simulation results obtained here would be beneficial to understand the CMS formation and reasonable to design the precursor molecular structure for fabrication of high-performance CMSMs.
