Vapor-Phase-Infiltrated AlO x /PIM-1 “Hybrid Scaffolds” as Solution-Processable Amine Supports for CO 2 Adsorption
Vapor-Phase-Infiltrated AlO x /PIM-1 “Hybrid Scaffolds” as Solution-Processable Amine Supports for CO 2 Adsorption
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气相渗透 AlO x /PIM-1 – 混合支架 – 作为可溶液加工的胺载体用于 CO 2 吸附
DOI：
10.1021/acsapm.1c00452
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发表时间：
2021
影响因子：
5
通讯作者：
Lively, Ryan P.
中科院分区：
文献类型：
--
作者：
Zhang, Fengyi;McGuinness, Emily K.;Ma, Yao;Ren, Yi;Leisen, Johannes E.;Losego, Mark D.;Lively, Ryan P.
高效吸附co2捕获既需要具有高co2容量的吸附材料，又需要具有快速传质动力学和低压降的结构化吸附接触器。目前最先进的研究主要集中在“硬”吸附剂上，如介孔沸石和金属有机框架，这些吸附剂具有很高的co2容量，但很难转化为结构接触剂。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“更柔软”的替代品，可以很容易地制造成结构吸附接触器。在先前的研究中，PIM-1被用作聚乙烯亚胺（PEI）的“分子筐”。尽管纳米级胺分散和优异的加工性能，PEI/PIM-1复合材料具有不稳定的微孔结构，在高PEI负载（~ 30%）时崩溃，导致二氧化碳吸附能力低于PEI负载的硬氧化物。在这里，我们应用了一种制造后的聚合物稳定方法，气相渗透（VPI），以提高PEI/PIM-1复合材料的co2容量，而不牺牲其加工性能。将PIM-1制成结构吸附接触器，然后通过VPI用无定形氢氧化铝（AlOx）纳米链增强。得到的AlOx/PIM-1是一种稳定的、分层多孔支撑，可以加载40%的PEI而不会导致孔隙破裂。由于PEI/AlOx/PIM-1复合材料具有可加工性、相当的co2容量和高胺效率，是一种很有前途的替代PEI负载介孔氧化物的材料。
Energy-efficient adsorptive CO2capture requires both adsorbent materials with high CO2capacity 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 CO2capacities 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 CO2adsorption capacity than PEI-loaded hard oxides. Here, we applied a post-fabrication polymer stabilization method, vapor phase infiltration (VPI), to improve the CO2capacity 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 (AlOx) nanostrands via VPI. The resulting AlOx/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 CO2capacity, and high amine efficiency, PEI/AlOx/PIM-1 composites are a promising alternative to PEI-loaded mesoporous oxides.