NO adsorption and temperature programmed desorption on K_2CO_3 modified activated carbons  

K_2CO_3改性活性炭上NO的吸附和程序升温脱附（英文）

作　　者：YANG Dai-jun MA Xiao-wei LV Hong LI Bing ZHANG Cun-man 杨代军;马晓伟;吕洪;李冰;张存满

机构地区：[1]School of Automotive Studies, Tongji University [2]Clean Energy Automotive Engineering Center, Tongji University [3]Department of Physics and Atmospheric Science, Dalhousie University

出　　处：《Journal of Central South University》2018年第10期2339-2348,共10页中南大学学报（英文版）

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

摘　　要：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 oC.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.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K_2CO_3增强商用活性炭吸附NO的性能。K_2CO_3改性活性炭(K_2CO_3 ACs)是通过超声波环境下的溶液浸渍活性炭,然后在800℃高温下热处理得到的。NO流量曲线表明,当K_2CO_3溶液的浓度达到19.5wt%时,NO在室温下的吸附容量最高,可达96mg/g,这相当于1196.1m^2/g的比表面积和0.70cm^3/g的总孔容。与未经改性的活性炭相比,K_2CO_3 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。

关 键 词：activated carbon potassium carbonate MODIFICATION NO adsorption temperature programmed desorption 

分 类 号：U469.72[机械工程—车辆工程]