Influence and mechanism of alkali-metal modification on ZSM-5 structure and toluene adsorption

CUI Yong-kang; XING Yi; SU Wei; WANG Jia-qing

doi:10.13374/j.issn2095-9389.2020.07.25.001

Volume 43 Issue 11

Nov. 2021

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Article Navigation > Chinese Journal of Engineering > 2021 > 43(11): 1534-1542

CUI Yong-kang, XING Yi, SU Wei, WANG Jia-qing. Influence and mechanism of alkali-metal modification on ZSM-5 structure and toluene adsorption[J]. Chinese Journal of Engineering, 2021, 43(11): 1534-1542. doi: 10.13374/j.issn2095-9389.2020.07.25.001

Citation:

CUI Yong-kang, XING Yi, SU Wei, WANG Jia-qing. Influence and mechanism of alkali-metal modification on ZSM-5 structure and toluene adsorption[J]. Chinese Journal of Engineering, 2021, 43(11): 1534-1542. doi: 10.13374/j.issn2095-9389.2020.07.25.001

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Influence and mechanism of alkali-metal modification on ZSM-5 structure and toluene adsorption

doi: 10.13374/j.issn2095-9389.2020.07.25.001

CUI Yong-kang^{1, 2},
XING Yi^{1, 2},
SU Wei^{1, 2
,
,},
WANG Jia-qing^{1, 2}

1.
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
2.
Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, Beijing 100083, China

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Corresponding author: E-mail: suwei3007@163.com
Received Date: 2020-07-25
Available Online: 2020-10-09
Publish Date: 2021-11-25

Abstract

Abstract

The microporous adsorbent ZSM-5 has been extensively applied for toluene adsorption. In this work, ZSM-5 was modified with alkali metals Li, Na, and K for toluene adsorption. The effects of the alkali metals introduced into ZSM-5 on the ZSM-5 microporous structure and toluene adsorption were studied via characterization techniques and mathematical modeling. Moreover, the influence of alkali metals on toluene adsorption was investigated from four aspects: adsorption capacity, exothermic energy, diffusion resistance, and desorption activation energy. The experimental results show that the introduction of alkali metal affect the ZSM-5 microporous structure in different aspects. The pore size, specific surface area, and pore volume of the modified ZSM-5 were of the following order: Li?ZSM-5 > Na?ZSM-5 > K?ZSM-5, corresponding to increasing ionic radius of the metals (Li⁺ < Na⁺ < K⁺). Likewise, the static saturated adsorption capacity was of the order: Li?ZSM-5 (0.363 mmol·g^?1) > Na?ZSM-5 (0.360 mmol·g^?1）> K?ZSM-5 (0.325 mmol·g^?1). The constant concentration wave model could well fit the adsorption and diffusion behaviors of toluene onto ZSM-5. The steric hindrance and electrostatic binding force played a dominant role in toluene diffusion in the ZSM-5 channel at high and low inlet gas concentrations, respectively. At a higher inlet concentration (155 mg·m^?3), the influence of alkali metal modification on the internal diffusion resistance for the three adsorbents was of the order: Li?ZSM-5< Na?ZSM-5 < K?ZSM-5, whereas at a lower inlet concentration (25 mg·m^?3), the trend was Li?ZSM-5 > Na?ZSM-5 > K?ZSM-5. The desorption kinetics analysis show that Na?ZSM-5 exhibite a better regeneration potential, due to its large pore size and moderate adsorption strength. In this study, the mechanism of alkali-metal modification of the adsorption behavior toward toluene was systematically investigated from two aspects: steric hindrance and adsorption strength to provide a certain reference for selecting a suitable adsorbent in complex practical environments.
- zeolite,
- toluene,
- steric hindrance,
- adsorption strength,
- alkali-metal modification

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References(26)

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