SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (9): 983-990.DOI: 10.1016/S1004-9541(13)60550-9

• 分离科学与工程 • 上一篇    下一篇

Experimental and Theoretical Studies of CO2 Absorption Enhancement by Nano-Al2O3 and Carbon Nanotube Particles

卢素敏, 邢敏, 孙燕, 董相均   

  1. Department of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
  • 收稿日期:2012-06-13 修回日期:2012-10-20 出版日期:2013-09-28 发布日期:2013-10-01
  • 通讯作者: LU Sumin

Experimental and Theoretical Studies of CO2 Absorption Enhancement by Nano-Al2O3 and Carbon Nanotube Particles

LU Sumin, XING Min, SUN Yan, DONG Xiangjun   

  1. Department of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
  • Received:2012-06-13 Revised:2012-10-20 Online:2013-09-28 Published:2013-10-01
  • Contact: LU Sumin

摘要: The influence of nano-particles on CO2 absorption was studied experimentally in a stirred thermostatic reactor. Nano-Al2O3 and carbon nanotube (CNT) particles which showed different hydrophobic properties were chosen for the investigation. The experimental results were compared with that of micron-size activated carbon (AC) and Al2O3 particles. From the results, no enhancement by micron-size Al2O3 was found, and with the increase of Al2O3 concentration, the enhancement factor decreased. However, nano-Al2O3 showed a weak enhancement for the CO2 absorption. AC and CNT particles all intensified the gas-liquid mass transfer effectively, yet the trend of the enhancement factor with stirring speed for the two particles was different. With increasing stirring speed, the enhancement factor of AC particles was decreased, whereas in CNT suspensions it was increased. The experimental phenomena demonstrated a difference in enhancement mechanism for different size particles. For nano-particles, besides the influence of adsorbability and hydrophobicity, the micro-convection caused by Brownian motion should be also taken into account. Considering the micro-convection effect, a theoretical model was developed to shed light on the absorption enhancement by nano-particles.

关键词: absorption enhancement, nano-particles, enhancement factor, Brownian motion

Abstract: The influence of nano-particles on CO2 absorption was studied experimentally in a stirred thermostatic reactor. Nano-Al2O3 and carbon nanotube (CNT) particles which showed different hydrophobic properties were chosen for the investigation. The experimental results were compared with that of micron-size activated carbon (AC) and Al2O3 particles. From the results, no enhancement by micron-size Al2O3 was found, and with the increase of Al2O3 concentration, the enhancement factor decreased. However, nano-Al2O3 showed a weak enhancement for the CO2 absorption. AC and CNT particles all intensified the gas-liquid mass transfer effectively, yet the trend of the enhancement factor with stirring speed for the two particles was different. With increasing stirring speed, the enhancement factor of AC particles was decreased, whereas in CNT suspensions it was increased. The experimental phenomena demonstrated a difference in enhancement mechanism for different size particles. For nano-particles, besides the influence of adsorbability and hydrophobicity, the micro-convection caused by Brownian motion should be also taken into account. Considering the micro-convection effect, a theoretical model was developed to shed light on the absorption enhancement by nano-particles.

Key words: absorption enhancement, nano-particles, enhancement factor, Brownian motion