Densification and pelletization of porous boron nitride fibers for effective CO2 adsorption

材料科学 颗粒 多孔性 造粒 氮化硼 挤压 复合材料 微型多孔材料 比表面积 吸附 化学工程 有机化学 化学 工程类 催化作用
作者
Jian Gou,Chang Liu,Jing Lin,Chao Yu,Yi Fang,Zhenya Liu,Zhonglu Guo,Chengchun Tang,Yang Huang
出处
期刊:Ceramics International [Elsevier BV]
卷期号:48 (8): 11636-11643 被引量:14
标识
DOI:10.1016/j.ceramint.2022.01.021
摘要

Due to the rich pore structure and high specific surface area, porous boron nitride (BN) shows good performance in gas adsorption. Densification and pelletization of porous BN powder into pellets with high porosity, desired porous structure and good mechanical strength is highly required for its practical CO2 capture. Here, we demonstrate the high-yield synthesis of BN pellets via a dichloromethane-assisted precipitation, extrusion and pyrolysis process. Without using any polymer binders, porous BN fibers with high aspect ratios are crisscrossed with each other and assembled into BN pellets with uniform cylinder-shaped macroscopic morphology. After pelletization, the bulk density and mechanical strength of BN pellets have been effectively improved. The prepared BN pellets have high specific surface area of 1098.9 m2/g, and pore volume up to 0.47 cc/g, in which the micropore volume is as high as 93.6% of the total pore volume, thus making the pellets show excellent equilibrium and dynamic CO2 adsorption capacity. Especially, due to the extremely rich ulta-micropores, the CO2/N2 selectivity of BN pellets is calculated to be 20.6 (at 1 bar), higher than the previously reported BN adsorbents. The present work demonstrates a new idea for the pelletization of BN materials, which provides the possibility to further expand the application fields of BN materials.
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