低分壓下二氧化碳吸附劑吸附效能評估

Evaluation of CO2 Adsorption Performance under Low CO2 Partial Pressures

周豐志(Feng-Jyh Jou) ； 吳淑姿(Shwu-Tzy Wu) ； 凃瑞澤(Jui-Rze Too) ； 余世宗(Shih-Tsung Yu)

《科學與工程技術期刊》 8卷2期 (2012/06) Pp. 11-18

https://doi.org/10.7117/JSET.201206.0011

摘要

本研究自行設計二氧化碳吸附設備，評估四種吸附劑：活性碳、沸石、silica xerogel、amine-grafted silica xerogel對二氧化碳之吸附效能，以應用於吸附去除室內低分壓二氧化碳。silica xerogel與amine-grafted silica xerogel由實驗室自行合成。為模擬室內環境，吸附試驗之起始二氧化碳濃度介於1,000-4,000 ppm，溫度20-45°C。沸石因易吸附水分，對二氧化碳吸附能力弱，其他三種吸附劑，隨吸附溫度增加，對二氧化碳去除率有增加趨勢。amine-grafted silica xerogel在35°C下對二氧化碳有較佳的吸附效率，當二氧化碳起始濃度1,000 ppm，經過吸附平衡後，去除效率可達35%。活性碳、silica xerogel與amine-grafted silica xerogel對二氧化碳吸附容量，隨二氧化碳初始濃度增加而有升高的趨勢。溫度升高，這三種吸附劑對二氧化碳之平衡吸附量亦增加，其中以amine-grafted silica xerogel對二氧化碳有最高平衡吸附量，5.46 μg/g，其次分別為silica xerogel（4.52μg/g）和活性碳（0.37μg/g）。amine-grafted silica xerogel於低二氧化碳分壓下對二氧化碳具吸附能力，應用於室內吸附去除二氧化碳頗具潛力。

關鍵字

活性碳 ； 沸石 ； silica xerogel ； amine-grafted silica xerogel ； 室內二氧化碳

並列摘要

A new apparatus for simulating indoor carbon dioxide adsorption was designed to evaluate 4 adsorbents: active carbon, zeolite, silica xerogel, and amine-grafted silica xerogel. Silica xerogel and amine-grafted silica xerogel were synthesized in the laboratory. The simulated indoor conditions were controlled for CO2 concentration and temperature at 1000-4000 ppm and 20-43°C, respectively. The zeolite easily absorbs moisture, which decreases its ability to adsorb CO2. CO2 adsorption in the other 3 adsorbents increased in conjunction with temperature. Amine-grafted silica xerogel showed the best CO2 adsorption capability (35%), with an initial CO2 concentration of 1000 ppm at 35 °C. The CO2 adsorption capabilities and equilibrium adsorption in active carbon, silica xerogel, and amine-grafted silica xerogel increased with a higher initial concentration of CO2 and a higher temperature. The amine-grafted silica xerogel showed the best equilibrium adsorption (5.46 μg/g). The equilibrium adsorption of silica xerogel and active carbon were 4.52 μg/g and 0.37 μg/g, respectively. The absorption capabilities of amine-grafted silica xerogel have potential applications to adsorb indoor carbon dioxide under low CO2 partial pressure.

並列關鍵字

active carbon ； zeolite ； silica xerogel ； amine-grafted silica xerogel ； indoor carbon dioxide