Ansari Mosim, Hanif Aamir, Abdelnaby Mahmoud M, Helal Aasif, Khan Mohd Yusuf
Interdisciplinary Research Center for Hydrogen Technologies and Carbon Management (IRC-HTCM), King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
Materials Science and Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
ACS Omega. 2025 Jan 15;10(3):2725-2734. doi: 10.1021/acsomega.4c08460. eCollection 2025 Jan 28.
The rising CO concentration in the atmosphere contributes significantly to global warming, necessitating effective carbon capture techniques. Amine-based solvents are widely employed for the chemisorption of CO, although they have drawbacks, such as degradation, corrosion, and high regeneration energy requirements. Physical adsorption of CO utilizing microporous adsorbents is a viable alternative that offers excellent efficiency and selectivity for CO capture. This work presents the facile one-pot synthesis of a 3D-triptycene-containing hyper-cross-linked microporous polymer (TBPP-OH) possessing hydroxyl groups. The presence of triptycene units in the TBPP-OH polymeric structure gives several desirable features, such as inherent microporosity, larger surface area, and improved thermal stability. TBPP-OH showed considerable microporosity (% = 70%), a larger BET-specific surface area (SA) of 838 m g, and good thermal stability ( = 372 °C and char yield > 60%) which makes it a promising adsorbent for CO capture. A strong affinity for CO was shown by TBPP-OH with of 32.9 kJ/mol demonstrating a superior CO adsorption capacity of 2.77 mmol/g at 273 K and 1 bar pressure where the volume of the micropore plays a significant role. The selectivity values of CO over N and CH for the polymer TBPP-OH were also estimated to be reasonably high indicating good potential for CO separation in different applications. The mechanism of CO adsorption was investigated by using Langmuir and dual-site Langmuir models.
大气中不断上升的一氧化碳浓度对全球变暖有显著影响，因此需要有效的碳捕获技术。基于胺的溶剂被广泛用于一氧化碳的化学吸附，尽管它们存在诸如降解、腐蚀和高再生能量需求等缺点。利用微孔吸附剂对一氧化碳进行物理吸附是一种可行的替代方法，它在一氧化碳捕获方面具有出色的效率和选择性。这项工作展示了一种简便的一锅法合成含三维三蝶烯的超交联微孔聚合物（TBPP-OH），该聚合物含有羟基。TBPP-OH聚合物结构中三蝶烯单元的存在赋予了几个理想的特性，如固有微孔性、更大的表面积和更高的热稳定性。TBPP-OH显示出相当大的微孔率（70%）、838 m²/g的较大BET比表面积以及良好的热稳定性（T₅₀ = 372 °C且焦炭产率>60%），这使其成为一种有前景的一氧化碳捕获吸附剂。TBPP-OH对一氧化碳表现出很强的亲和力，吸附热为32.9 kJ/mol，在273 K和1 bar压力下展示出2.77 mmol/g的优异一氧化碳吸附容量，此时微孔体积起着重要作用。还估计了聚合物TBPP-OH对一氧化碳相对于氮气和甲烷的选择性值相当高，表明在不同应用中具有良好的一氧化碳分离潜力。通过使用朗缪尔和双位点朗缪尔模型研究了一氧化碳的吸附机理。
