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Breakthrough co_2 adsorption in bio-based activated carbons

Journal of Environmental Sciences 2015年第8期27卷 68-76页

作者： Sepideh Shahkarami Ramin Azargohar Ajay K.Dalai Jafar Soltan Department of Chemical and Biological Engineering University of Saskatchewan

In this work, the effects of different methods of activation on co2 adsorption performance of activated carbon were studied. activated carbons were prepared from biochar, obtained from fast pyrolysis of white wood, using three different activation methods of steam activation, co2 activation and Potassium hydroxide（KOH） activation. co2 adsorption behavior of the produced activated carbons was studied in a fixed-bed reactor set-up at atmospheric pressure, temperature range of 25–65°C and inlet co2 concentration range of10–30 mol% in He to determine the effects of the surface area, porosity and surface chemistry on adsorption capacity of the samples. Characterization of the micropore and mesopore texture was carried out using N2 and co2 adsorption at 77 and 273 K, *** composite design was used to evaluate the combined effects of temperature and concentration of co2 on the adsorption behavior of the adsorbents. The KOH activated carbon with a total micropore volume of 0.62 cm3/g and surface area of 1400 m2/g had the highest co2 adsorption capacity of 1.8 mol/kg due to its microporous structure and high surface area under the optimized experimental conditions of 30 mol% co2 and 25°C. The performance of the adsorbents in multi-cyclic adsorption process was also assessed and the adsorption capacity of KOH and co2 activated carbons remained remarkably stable after50 cycles with low temperature（160°C） regeneration.

关键词： biochar activated carbon dynamic co2adsorption micropore surface area

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