Journal of Inorganic Materials ›› 2015, Vol. 30 ›› Issue (1): 17-22.DOI: 10.15541/jim20140251

• Orginal Article • Previous Articles     Next Articles

Effects of Alkali/Char Ratio and Activation Temperature on Ultramicropores of Rice Husk Active Carbon

LI Da-Wei1, 2, MA Teng-Fei1, 3, TIAN Yuan-Yu1, 2, ZHU Xi-Feng4, QIAO Ying-Yun2   

  1. (1. College of Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China; 2. Research Centre for Low-carbon Energy Sources, Shandong University of Science and Technology, Qingdao 266590, China; 3. PetroChina Liaoyang Petrochemical Company, Liaoyang 111003, China; 4. Key Laboratory for Biomass Clean Energy of Anhui Province, University of Science and Technology of China, Hefei 230026, China)
  • Received:2014-05-13 Revised:2014-07-13 Online:2015-01-20 Published:2014-12-29
  • About author:LI Da-Wei. E-mail:
  • Supported by:
    National Natural Science Foundation of China (51206099);Key Research Programof the Chinese Academy of Sciences (KGZD-EW-304-3);Program for New Century Excellent Talent in University of the Ministry of Education of China (NCET-11-1031)


Porous carbons were prepared by KOH activation of rice husk char at alkali/char ratios of 0.6︰1 to 3︰1 and activation temperatures from 640℃ to 780 ℃. The obtained porous carbons were characterized using N2 adsorption and desorption technique, CO2 adsorption, TG-FTIR analyses. The results indicate that the ultramicropore size of the prepared porous carbons is mostly in the range of 0.42-0.70 nm. As the alkali/char ratio increases, the volume of ultramicropores first rises and then diminishes, whereas the volume of ultramicropores tends to decrease monotonously with the increase of activation temperature. A microporous carbon with ultramicropore volume of 0.149 mL/g, ultramicropore fraction of 36.3%, pore volume of 0.411 mL/g, and specific surface area of 774 m2/g, can be produced by activation at 640℃ at the alkali/char ratio of 1︰1. The ultramicropore volume of the porous carbons and their CO2 uptake at 104 Pa display a strong linear relationship.

Key words: active carbon, ultramicropore, KOH, rice husk

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