酚醛树脂基球型活性炭制备及VOCs废气吸附性能研究

Synthesis of phenolic resin-based spherical activated carbon and its adsorption performance for VOCs

  • 摘要: 在碳达峰、碳中和目标及欧盟ESG法规的推动下,活性炭吸附-回收工艺凭借治理挥发性有机化合物(VOCs)和回收溶剂的优势,有效降低产品碳关税,竞争力日益凸显。本研究以酚醛树脂、六亚甲基四胺和乙醇为原料制备酚醛树脂基球型活性炭(PSAC);以甲苯和乙酸乙酯为目标污染物,考察温度对PSAC吸附性能的影响,分析其吸附动力学;并与性能良好的沥青基球状活性炭(BAC)展开对比。结果显示,40 °C时乙酸乙酯吸附能力最佳,为695.0 mg/g;50 °C时甲苯吸附能力最佳,为450.3 mg/g。Yoon-Nelson、Thomas和Adams-Bohart模型均能较好地拟合吸附穿透曲线;而准二阶模型较准一阶模型更适用于VOCs的吸附模拟。PSAC具备由大孔、介孔和微孔构成的多级多孔结构,微孔分布集中,吸附容量为BAC的101.4%。此外,PSAC还展现出更高的VOCs吸附速率(0.096 min⁻¹)、更低的扩散阻力及较低的制备成本(4.6万元/吨)。经12次吸附循环后,PSAC对VOCs的吸附性能仍能保持在80%以上。PSAC商业价值和市场竞争力突出,可支撑后续反应器设计和工艺应用,在碳关税挑战中具有明显优势。

     

    Abstract: Driven by the goals of carbon peaking, carbon neutrality, and the EU's ESG regulations, the activated carbon adsorption-recovery process has demonstrated increasing competitiveness due to its advantages in treating volatile organic compounds (VOCs) and recovering solvents, effectively reducing product carbon tariffs. The phenolic resin, hexamethylenetetramine, and ethanol are utilized to prepare phenolic resin-based activated carbon (PSAC). This study investigates the effect of temperature on the adsorption performance of PSAC using toluene and ethyl acetate as target VOCs. Additionally, a comparison was conducted with high-performance asphalt-based spherical activated carbon (BAC). The results indicate that the adsorption capacity of ethyl acetate reaches its peak at 40 °C, measuring 695.0 mg/g, while the optimal toluene adsorption capacity is achieved at 50 °C, recorded at 450.3 mg/g. The Yoon-Nelson, Thomas, and Adams-Bohart models all fit the adsorption penetration curve well. The pseudo-second-order kinetic model is found to be more suitable for simulating VOC adsorption than the pseudo-first-order model. PSAC exhibits a multi-level porous structure comprising macropores, mesopores, and micropores, with a concentrated micropore distribution. The adsorption capacity of PSAC is 101.4% of that of BAC. Meanwhile, PSAC has a higher VOCs adsorption rate (0.096 min-1), lower diffusion resistance, and lower preparation cost (46,000 yuan/ton). After 12 cycles, the adsorption performance of VOCs exceeds 80%. PSAC possesses significant commercial value and market competitiveness, supporting future reactor design and process applications, and providing a clear advantage in the face of carbon tariff challenges.

     

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