A novel mechanism of controlling ultramicropore size in carbons at sub-angstrom level for molecular sieving of propylene/propane mixtures,Journal of Materials Chemistry A

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A novel mechanism of controlling ultramicropore size in carbons at sub-angstrom level for molecular sieving of propylene/propane mixtures
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-10-19 , DOI: 10.1039/d1ta07261g
Shengjun Du ₁ , Jiawu Huang ₁ , Abdul Waqas Anjum ₂ , Jing Xiao ₂ , Zhong Li _{1,

2}

Affiliation

The preparation of carbon materials with a molecular sieve function is very challenging due to their noncrystalline structure, but they have broad application prospects in petrochemical industries for the separation of gas mixtures. Herein, we report a novel mechanism of controlling ultramicropore size in carbons at sub-angstrom level, and with starch as a carbon source, successful fabrication of novel carbon molecular sieves (SCMSs), with a pore size distribution centered at 4.78 Å that is in-between the kinetic diameters of propylene (4.68 Å) and propane (<5.11 Å) molecules. The propylene uptake of one sample (SCMS-0.2-800) reached as high as 2.54 mmol g⁻¹ at 298 K and 1 bar, while propane was nearly excluded thereby accomplishing complete size-sieving of propylene from propane. The propylene uptake even outperforms the crystalline porous adsorbents reported to date. In addition, by structure characterization and performance tests, we demonstrate that the formation of sieving pores is attributed to a synergistic effect of a pyrolysis pore-making process and pore-shrinking induced by high temperature. This work paves a new avenue towards the design of a new generation of carbon molecular sieve adsorbents with well-defined sub-nanopores for the effective separation of light hydrocarbon mixtures with similar sizes.

中文翻译：

丙烯/丙烷混合物分子筛分控制亚埃级碳超微孔尺寸的新机制

具有分子筛功能的碳材料由于其非晶结构而极具挑战性，但它们在石油化工行业分离气体混合物方面具有广阔的应用前景。在此，我们报告了一种控制亚埃级碳超微孔尺寸的新机制，并以淀粉为碳源，成功制造了新型碳分子筛 (SCMS)，其孔径分布中心为 4.78 Å，在-介于丙烯 (4.68 Å) 和丙烷 (<5.11 Å) 分子的动力学直径之间。一种样品 (SCMS-0.2-800) 的丙烯吸收量高达 2.54 mmol g ^-1在 298 K 和 1 bar 下，丙烷几乎被排除在外，从而实现了从丙烷中完全筛选出丙烯。丙烯吸收甚至优于迄今为止报道的结晶多孔吸附剂。此外，通过结构表征和性能测试，我们证明筛孔的形成归因于热解造孔过程和高温引起的孔收缩的协同作用。这项工作为设计具有明确亚纳米孔的新一代碳分子筛吸附剂铺平了新的途径，用于有效分离具有相似尺寸的轻烃混合物。

更新日期：2021-10-24

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