Mahmoudi Fereshteh, Kahforoushan Davood, Ziaei Soroush
Environmental Engineering Research Center (EERC), Sahand University of Technology, Tabriz, Iran.
Faculty of chemical engineering, Sahand University of Technology, Tabriz, Iran.
Environ Technol. 2025 Feb;46(6):948-962. doi: 10.1080/09593330.2024.2372055. Epub 2024 Jul 7.
Carbon capture and storage (CCS) is crucial in mitigating greenhouse gas emissions. Solid adsorbents, notable for their reusability and corrosion resistance, are gaining attention in CO gas separation. This study uses Silica fume as an adsorbent and silica source for SiO and MCM-41 silica-based adsorbents. Silica was extracted via an alkaline dissolution method, and adsorbents were synthesized using a CO-induced precipitation method, chosen for its shorter synthesis time and CO utilization. The effects of pore volume, average pore diameter, and specific surface area on amine loading and CO adsorption capacity were investigated using CTAB surfactant in SiO synthesis, resulting in MCM-41. The synthesized adsorbents were modified with TEPA and DEA amines due to their high affinity for CO. After determining optimal amine loading, the impact of combining TEPA with DEA was examined. The highest CO adsorption capacity under simulated flue gas conditions (15% volume CO and 85% volume N) was 198 milligrams per gram of adsorbent for the SiO adsorbent functionalized with 50% by weight amine (28% TEPA and 22% DEA). Variations in CO adsorption over time, the influence of adsorbent quantity on adsorption capacity, the affinity of the adsorbent for N adsorption, and the adsorption-desorption cycle were investigated. The 28%TEPA-22%DEA-SiO adsorbent emerged as the optimal choice due to its large total volume and average pore diameter, absence of a template in its structure, excellent performance in CO adsorption, lack of affinity for N, and robust adsorption-desorption stability.
碳捕获与封存（CCS）对于减少温室气体排放至关重要。固体吸附剂因其可重复使用性和耐腐蚀性而备受关注，在CO气体分离中受到越来越多的关注。本研究使用硅灰作为吸附剂和SiO及MCM - 41硅基吸附剂的硅源。通过碱性溶解法提取二氧化硅，并采用CO诱导沉淀法合成吸附剂，该方法因其合成时间短和CO利用率高而被选用。在SiO合成过程中使用CTAB表面活性剂研究了孔体积、平均孔径和比表面积对胺负载量和CO吸附容量的影响，从而得到MCM - 41。由于合成的吸附剂对CO具有高亲和力，因此用TEPA和DEA胺对其进行了改性。在确定最佳胺负载量后，研究了将TEPA与DEA结合的影响。在模拟烟气条件（15%体积的CO和85%体积的N）下，对于用50%重量胺（28% TEPA和22% DEA）官能化的SiO吸附剂，最高CO吸附容量为每克吸附剂198毫克。研究了CO吸附随时间的变化、吸附剂用量对吸附容量的影响、吸附剂对N吸附的亲和力以及吸附 - 解吸循环。28%TEPA - 22%DEA - SiO吸附剂因其总体积和平均孔径大、结构中无模板、CO吸附性能优异、对N无亲和力以及强大的吸附 - 解吸稳定性而成为最佳选择。
