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<p>Developing novel granular carbon molecular sieves (CMSs) with sub-angstrom molecular recognition accuracy for effective C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> separation is highly desirable for petrochemical industry. However, this remains an immense challenge due to their similar molecular sizes and properties. Herein, we explore a unique and eco-friendly method to transform coconut shells into granular CMS using a novel mechanism to control pore size distribution (PSD) in carbon materials. The resulting CBCMS-800 selectively adsorbs C<sub>2</sub>H<sub>4</sub> with an uptake of 2.15 mmol/g while almost repels C<sub>2</sub>H<sub>6</sub>, showcasing a 0.28 Å molecular recognition resolution. Its C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> uptake ratio is up to 15.36, comparable to those advanced metal organic frameworks (MOFs) with high C<sub>2</sub>H<sub>4</sub> selectivity. The breakthrough curves of the C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> mixture were measured to demonstrate the excellent separation performance of CBCMS-800. The subtle evolution of the PSD in amorphous CMS materials is revealed through an innovative combination of multiple characterization techniques. The approach developed in this work for precisely controlling PSD at the sub-angstrom scale in novel granular CMS holds significant implications for the future fabrication of CMS materials for the efficient separation of light hydrocarbons.</p>

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Precise controlling pore size distribution at sub-angstrom scale in granular novel carbon molecular sieves derived from coconut shell for separating ethylene and ethane

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Haoyuan Luo,
  • Daohao Zhou,
  • Fei Teng,
  • Jiaying Wang,
  • Qibin Xia,
  • Xin Zhou,
  • Zhong Li

摘要

Developing novel granular carbon molecular sieves (CMSs) with sub-angstrom molecular recognition accuracy for effective C2H4/C2H6 separation is highly desirable for petrochemical industry. However, this remains an immense challenge due to their similar molecular sizes and properties. Herein, we explore a unique and eco-friendly method to transform coconut shells into granular CMS using a novel mechanism to control pore size distribution (PSD) in carbon materials. The resulting CBCMS-800 selectively adsorbs C2H4 with an uptake of 2.15 mmol/g while almost repels C2H6, showcasing a 0.28 Å molecular recognition resolution. Its C2H4/C2H6 uptake ratio is up to 15.36, comparable to those advanced metal organic frameworks (MOFs) with high C2H4 selectivity. The breakthrough curves of the C2H4/C2H6 mixture were measured to demonstrate the excellent separation performance of CBCMS-800. The subtle evolution of the PSD in amorphous CMS materials is revealed through an innovative combination of multiple characterization techniques. The approach developed in this work for precisely controlling PSD at the sub-angstrom scale in novel granular CMS holds significant implications for the future fabrication of CMS materials for the efficient separation of light hydrocarbons.