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<p>Developing efficient adsorbents for separating methanol-to-olefins (MTO) products to obtain high-purity C<sub>3</sub>H<sub>6</sub> and C<sub>2</sub>H<sub>4</sub> is of great importance to the chemical industry. However, given the high-temperature and high-humidity conditions in practical separation processes, adsorbents must possess exceptional stability and water resistance. We herein report a dual-pore hydrogen-bonded organic framework (HOF-TDBB) that demonstrates not only a significant difference in C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub> adsorption but also excellent framework stability, thus achieving superior C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub> separations under industrially harsh conditions. At 298 K, HOF-TDBB exhibits a high C<sub>3</sub>H<sub>6</sub> uptake of 113.9 cm<sup>3</sup> g<sup>−1</sup> and an equimolar C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub> selectivity of 11.7, surpassing the performance of most reported adsorbents. After one separation operation, 3.2 mol kg<sup>−1</sup> of C<sub>2</sub>H<sub>4</sub> (purity &gt; 99.95%) and 2.4 mol kg<sup>−1</sup> of C<sub>3</sub>H<sub>6</sub> (purity &gt; 99.5%) can be obtained from the equimolar C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub> mixture. More importantly, the separation experiemnts under high temperatures and high humidity show that polymer-grade C<sub>2</sub>H<sub>4</sub> (1.6 mol kg<sup>−1</sup>) and C<sub>3</sub>H<sub>6</sub> (1.2 mol kg<sup>−1</sup>) can even be collected at 338 K and 100% relative humidity, which is rarely seen in C<sub>3</sub>H<sub>6</sub>/C<sub>2</sub>H<sub>4</sub> separation materials.</p>

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A dual-pore hydrogen-bonded organic framework with exceptional stability for efficient separation of MTO products

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Zhenyu Ji,
  • Lingna Yang,
  • Yunzhe Zhou,
  • Ting Zhao,
  • Maochun Hong,
  • Mingyan Wu

摘要

Developing efficient adsorbents for separating methanol-to-olefins (MTO) products to obtain high-purity C3H6 and C2H4 is of great importance to the chemical industry. However, given the high-temperature and high-humidity conditions in practical separation processes, adsorbents must possess exceptional stability and water resistance. We herein report a dual-pore hydrogen-bonded organic framework (HOF-TDBB) that demonstrates not only a significant difference in C3H6/C2H4 adsorption but also excellent framework stability, thus achieving superior C3H6/C2H4 separations under industrially harsh conditions. At 298 K, HOF-TDBB exhibits a high C3H6 uptake of 113.9 cm3 g−1 and an equimolar C3H6/C2H4 selectivity of 11.7, surpassing the performance of most reported adsorbents. After one separation operation, 3.2 mol kg−1 of C2H4 (purity > 99.95%) and 2.4 mol kg−1 of C3H6 (purity > 99.5%) can be obtained from the equimolar C3H6/C2H4 mixture. More importantly, the separation experiemnts under high temperatures and high humidity show that polymer-grade C2H4 (1.6 mol kg−1) and C3H6 (1.2 mol kg−1) can even be collected at 338 K and 100% relative humidity, which is rarely seen in C3H6/C2H4 separation materials.