This study reveals the significant improvement of adsorption capacity of carbon dioxide (CO₂) onto spherical phenol resin (PR) activated by potassium hydroxide (KOH), designated KOH6-PR. Experiments were performed using a gravimetric adsorption measurement instrument for the wide range of temperatures 20–70 °C and pressure up to 7 MPa. The measured excess uptakes were found steadily increase up to 5.7 MPa at 25 °C and reached the value of 1.69 g g⁻¹. After that, a declining trend was observed, which is corrected by the adsorbed gas density and pore volume of the adsorbent. The measured isotherm data were examined using the modified Dubinin-Astakhov (D-A) model, and the Tóth model within a 3.7 % root mean square deviation (RMSD). The maximum CO₂ adsorption capacity of microporous KOH6-PR was found 2.36 cm³ g⁻¹ using the modified d-A model. The adsorption capacity showed more than 50 % enhancement compared to the widely used Maxsorb III. The average value of heat of adsorption is calculated employing the Clausius-Clapeyron and the modified d-A equations. The cooling performance of an adsorption cycle using the KOH6-PR/CO₂ pair is predicted. These analyses are necessary for utilizing CO₂ as a refrigerant in adsorption heat pumps and gas storage applications.

这项研究揭示了二氧化碳（CO ₂）在被称为KOH6-PR的氢氧化钾（KOH）活化的球形酚醛树脂（PR）上的吸附能力的显着提高。实验是使用重力吸附测量仪器在20–70°C的温度范围和最高7 MPa的压力范围内进行的。发现测得的过量摄入量在25°C时稳定增加至5.7 MPa，达到1.69 gg ^-1的值。之后，观察到下降的趋势，该趋势通过吸附的气体密度和吸附剂的孔体积来校正。使用改良的Dubinin-Astakhov（DA）模型和Tóth模型在3.7％均方根偏差（RMSD）内检查了测得的等温线数据。最大CO ₂使用改进的d -A模型，发现微孔KOH6-PR的吸附容量为2.36 cm ³  g ^-1。与广泛使用的Maxsorb III相比，其吸附能力提高了50％以上。吸附热的平均值使用克劳修斯-克拉珀龙和改进的d -A方程计算。预测了使用KOH6-PR / CO ₂对的吸附循环的冷却性能。这些分析对于在吸附热泵和气体存储应用中利用CO ₂作为制冷剂是必要的。