Vapor-Phase-Infiltrated AlOx/PIM-1 “Hybrid Scaffolds” as Solution-Processable Amine Supports for CO2 Adsorption,ACS Applied Polymer Materials

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Vapor-Phase-Infiltrated AlOx/PIM-1 “Hybrid Scaffolds” as Solution-Processable Amine Supports for CO2 Adsorption
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2021-08-12 , DOI: 10.1021/acsapm.1c00452
Fengyi Zhang ₁ , Emily K. McGuinness ₂ , Yao Ma ₁ , Yi Ren ₁ , Johannes E. Leisen ₃ , Mark D. Losego ₂ , Ryan P. Lively ₁

Affiliation

Energy-efficient adsorptive CO₂ capture requires both adsorbent materials with high CO₂ capacity and structured adsorption contactors possessing fast mass transfer kinetics and low pressure drop. The state-of-the-art research primarily focuses on “hard” adsorbents such as mesoporous zeolites and metal–organic frameworks, which exhibit high CO₂ capacities but are challenging to translate into structured contactors. Polymer of intrinsic microporosity 1 (PIM-1), a solution-processable microporous polymer, is a “softer” alternative that can be easily fabricated into structured adsorption contactors. In prior research, PIM-1 has been utilized as a “molecular basket” for poly(ethylene imine) (PEI). Despite nanoscale amine dispersion and excellent processability, PEI/PIM-1 composites possess an unstable micropore structure, which collapses at high PEI loadings (∼30%) and results in lower CO₂ adsorption capacity than PEI-loaded hard oxides. Here, we applied a post-fabrication polymer stabilization method, vapor phase infiltration (VPI), to improve the CO₂ capacity of the PEI/PIM-1 composite without sacrificing its processibility. PIM-1 is fabricated into structured adsorption contactors and then reinforced with amorphous aluminum oxyhydroxide (AlO_x) nanostrands via VPI. The resulting AlO_x/PIM-1 is a stable, hierarchically porous support, which can be loaded with 40% PEI without pore collapse. Owing to the combination of processibility, comparable CO₂ capacity, and high amine efficiency, PEI/AlO_x/PIM-1 composites are a promising alternative to PEI-loaded mesoporous oxides.

中文翻译：

气相渗透 AlOx/PIM-1“混合支架”作为可溶液加工胺支持 CO2 吸附

节能的吸附性 CO ₂捕获需要具有高 CO ₂容量的吸附材料和具有快速传质动力学和低压降的结构化吸附接触器。最先进的研究主要集中在“硬”吸附剂上，例如介孔沸石和金属有机骨架，它们表现出高 CO ₂能力，但很难转化为结构化的接触器。固有微孔聚合物 1 (PIM-1) 是一种可溶液加工的微孔聚合物，是一种“更软”的替代品，可以轻松制造成结构化吸附接触器。在先前的研究中，PIM-1 已被用作聚（乙烯亚胺）（PEI）的“分子篮”。尽管具有纳米级胺分散和优异的加工性能，但 PEI/PIM-1 复合材料具有不稳定的微孔结构，在高 PEI 负载（~30%）时会坍塌，导致 CO ₂吸附能力低于负载 PEI 的硬氧化物。在这里，我们应用了一种制造后聚合物稳定方法，即气相渗透 (VPI)，以改善 CO ₂PEI/PIM-1 复合材料的容量而不牺牲其可加工性。PIM-1 被制成结构化吸附接触器，然后通过 VPI用无定形羟基氧化铝 (AlO _x ) 纳米链增强。所得的 AlO _x /PIM-1 是一种稳定的分级多孔载体，可以负载 40% 的 PEI 而不会发生孔隙坍塌。由于可加工性、可比较的 CO ₂容量和高胺效率的结合，PEI/AlO _x /PIM-1 复合材料是负载 PEI 的介孔氧化物的有前途的替代品。

更新日期：2021-09-10

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