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NO adsorption and temperature programmed desorption on K2CO3 modified activated carbons

K2CO3 改性活性炭上 NO 的吸附和程序升温脱附

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Abstract

Fuel cell stacks as the automotive power source can be severely poisoned by a trace amount of NOx in atmosphere, which makes it necessary to provide clean air for fuel cell vehicles. In this work, activating commercial activated carbons with K2CO3 for the large enhancement of NO capture was studied. K2CO3 modified activated carbons (K2CO3 ACs) were prepared by impregnating activate carbons in K2CO3 solution under ultrasound treatment, followed by temperature programmed baking at 800 °C. The dynamic NO flow tests on K2CO3 ACs at room temperature indicated that NO adsorption capacity reached the maximum (96 mg/g) when K2CO3 loading was 19.5 wt%, which corresponded to a specific surface area of 1196.1 m2/g and total pore volume of 0.70 cm3/g. The ten-fold enhancement of NO adsorption on K2CO3 ACs compared to the unimpregnated activated carbon was mainly attributed to the formation of potassium nitrite, which was confirmed by FTIR and temperature programmed desorption measurements. Regeneration tests of NO adsorption on the optimum sample revealed that 76% of the NO adsorption capacity could be remained after the fourth cycle.

摘要

燃料电池易受到空气中的 NOx 的影响, 因此有必要净化进入燃料电池汽车的空气。 本文研究了通过 K2CO3 增强商用活性炭吸附 NO 的性能。 K2CO3 改性活性炭 (K2CO3 ACs) 是通过超声波环境下的溶液浸渍活性炭, 然后在 800 °C 高温下热处理得到的。 NO 流量曲线表明, 当 K 2CO3 溶液的浓度达到 19.5 wt% 时, NO 在室温下的吸附容量最高, 可达 96 mg/g, 这相当于 1196.1 m2/g 的比表面积和 0.70 cm3/g 的总孔容。 与未经改性的活性炭相比, K2CO3 ACs 的吸附能力提升了十倍; 这主要应归因于亚硝酸钾的生成, 这也经FTIR 和程序升温脱附实验结果得以证明。 此外, 该样品还表现出一定的可再生性, 经四次 NO 吸附和脱附实验室, 它还能保持 76% 的初始吸附容量。

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Authors and Affiliations

  1. School of Automotive Studies, Tongji University, Shanghai, 201804, China

    Dai-jun Yang  (杨代军), Hong Lv  (吕洪), Bing Li  (李冰) & Cun-man Zhang  (张存满)

  2. Clean Energy Automotive Engineering Center, Tongji University, Shanghai, 201804, China

    Dai-jun Yang  (杨代军), Hong Lv  (吕洪), Bing Li  (李冰) & Cun-man Zhang  (张存满)

  3. Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia, B3H 3J5, Canada

    Xiao-wei Ma  (马晓伟)

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  1. Dai-jun Yang  (杨代军)
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  2. Xiao-wei Ma  (马晓伟)
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Correspondence to Hong Lv  (吕洪).

Additional information

Foundation item: Project(2018YFB0105303) supported by the Ministry of Science and Technology of China; Project(17DZ1200702) supported by the Shanghai Science and Technology Committee, China

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Yang, Dj., Ma, Xw., Lv, H. et al. NO adsorption and temperature programmed desorption on K2CO3 modified activated carbons. J. Cent. South Univ. 25, 2339–2348 (2018). https://doi.org/10.1007/s11771-018-3918-1

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  • DOI: https://doi.org/10.1007/s11771-018-3918-1

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