TY - JOUR
T1 - Rapid CO 2 Adsorption over Hierarchical ZSM-5 with Controlled Mesoporosity
AU - Qian, Xingchi
AU - Bai, Gaozhi
AU - He, Pingping
AU - Fei, Zhaoyang
AU - Liu, Qing
AU - Zhang, Zhuxiu
AU - Chen, Xian
AU - Tang, Jihai
AU - Cui, Mifen
AU - Qiao, Xu
N1 - Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/12/12
Y1 - 2018/12/12
N2 - Alkyltrimethoxysilanes with different chain lengths (trimethoxypropylsilane, trimethoxyoctylsilane, and dodecyltrimethoxysilane) were utilized as mesopore-generating agents to synthesize hierarchical ZSM-5 samples with different amounts of mesoporous volume. The samples were characterized by X-ray powder diffraction, nitrogen adsorption-desorption, scanning electron microscopy, transmission electron microscopy, and CO 2 erature-programmed desorption. With the growth of chain length, the alkyltrimethoxysilanes showed low reactivity and affinity for the surfaces of zeolite precursors due to the increase of hydrophobic character of the alkyl moiety, which resulted in the decrease of mesoporous volume. CO 2 adsorption behaviors of the samples including adsorption capacity, adsorption kinetics, adsorption selectivity, adsorption thermodynamics, and adsorbent stability were studied. The experimental results indicated that hierarchical ZSM-5 modified by trimethoxypropylsilane exhibited the highest mesopores volume (0.12 cm 3 ·g -1 ), corresponding to the fastest capture rate (about 2.5 times of conventional ZSM-5) and the highest capture capacity (2.15 mmol·g -1 at 25 °C and 100 kPa). Therefore, hierarchical ZSM-5 synthesized by the alkyltrimethoxysilanes with short chain length can generate extra mesopores and active adsorption sites, which provided a new strategy to regulate the structure of ZSM-5 for rapid CO 2 adsorption.
AB - Alkyltrimethoxysilanes with different chain lengths (trimethoxypropylsilane, trimethoxyoctylsilane, and dodecyltrimethoxysilane) were utilized as mesopore-generating agents to synthesize hierarchical ZSM-5 samples with different amounts of mesoporous volume. The samples were characterized by X-ray powder diffraction, nitrogen adsorption-desorption, scanning electron microscopy, transmission electron microscopy, and CO 2 erature-programmed desorption. With the growth of chain length, the alkyltrimethoxysilanes showed low reactivity and affinity for the surfaces of zeolite precursors due to the increase of hydrophobic character of the alkyl moiety, which resulted in the decrease of mesoporous volume. CO 2 adsorption behaviors of the samples including adsorption capacity, adsorption kinetics, adsorption selectivity, adsorption thermodynamics, and adsorbent stability were studied. The experimental results indicated that hierarchical ZSM-5 modified by trimethoxypropylsilane exhibited the highest mesopores volume (0.12 cm 3 ·g -1 ), corresponding to the fastest capture rate (about 2.5 times of conventional ZSM-5) and the highest capture capacity (2.15 mmol·g -1 at 25 °C and 100 kPa). Therefore, hierarchical ZSM-5 synthesized by the alkyltrimethoxysilanes with short chain length can generate extra mesopores and active adsorption sites, which provided a new strategy to regulate the structure of ZSM-5 for rapid CO 2 adsorption.
UR - http://www.scopus.com/inward/record.url?scp=85058558713&partnerID=8YFLogxK
U2 - 10.1021/acs.iecr.8b03325
DO - 10.1021/acs.iecr.8b03325
M3 - 文章
AN - SCOPUS:85058558713
SN - 0888-5885
VL - 57
SP - 16875
EP - 16883
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
IS - 49
ER -