文献类型：期刊文献

英文题名：Self-Activation Mechanism Investigations on Large K2CO3-Doped Li4SiO4 Sorbent Particles

作者：Zhang, Sai[1];Zhang, Qi[1];Shen, Chen[1];Ni, Yanhui[1];Wu, Yongqiang[1];Wu, Qiufang[2];Zhu, Zibin[1]

机构：[1]E China Univ Sci & Technol, Dept Chem Engn, Shanghai 200237, Peoples R China;[2]Shanghai Huaming Hitech Grp Co Ltd, Shanghai 200237, Peoples R China

年份：2015

卷号：54

期号：29

起止页码：7292

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20153201114901);WOS:【SCI-EXPANDED(收录号:WOS:000358895800013)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Grant 21176080) and supported by the Shanghai Rising-Star Program (B type) (Grant 13QB1401300).

语种：英文

外文关键词：Lithium compounds - Potash - Silicon compounds - Sorption - Pore size - Chemical activation - Scanning electron microscopy - Carbon dioxide - Diffusion

摘要：This work investigated the self-activation behavior of large K2CO3-doped Li4SiO4 sorbent particles. In this self-activation mechanism, the Sorption ability increased as the number Of cycles increased. After the sorption-desorption cycles occurred, the sorption ability of the K2CO3-cloped Li4SiO4 sorbent was remarkably, enhanced from approximately 2.0 mmol CO2/g-sorbent to approximately 5.0 mmol CO2/g sorbent at 565 degrees C in 10 vol % CO2 atmosphere. The fresh and used sorbents were then Characterized through N-2 adsorption and SEM methods. Results showed that the average pore size increased from 7 to 32 nm and the surface microstructure changed from dense to porous, because the molten eutectic mixture formed by Li2CO3 and Li2SiO3 can facilitate CO2 diffusion. The formed CO2 diffusion channel can provide more CO2 accessibility; this channel can also reduce the CO2 diffusion resistance through the product layer, Therefore, the sorption ability of the sorbent is enhanced. Meanwhile, the effects of the self-activation temperature were also investigated-and the results revealed that the optimal self-activation temperature is 615 degrees C. Furthermore, under critical conditions, the self-activated sorbent performed more efficiently than the fresh Sample. At 450 degrees C under 10 vol % CO2 atmosphere, the sorption capacity of the self-activated sorbent was approximately 20 times higher than that of the fresh sample. Finally, a pore-core model was also proposed to illustrate the K2CO3-doped Li4SiO4 self-activation mechanism.