Effect of Irreversible Adsorption on Diffusion in ZSM-5 Molecular Sieve

梁五更; 陈诵英; 彭少逸

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Effect of Irreversible Adsorption on Diffusion in ZSM-5 Molecular Sieve

更新时间：2025-12-16

- Effect of Irreversible Adsorption on Diffusion in ZSM-5 Molecular Sieve
- CIESC Journal Issue 6, (1991)
- 作者机构：
  
  中国科学院山西煤炭化学研究所,中国科学院山西煤炭化学研究所,中国科学院山西煤炭化学研究所太原030001,太原030001,太原,030001
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 December 1991，
  
  Published：25 December 1991
- 稿件说明：
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梁五更, 陈诵英, 彭少逸. Effect of Irreversible Adsorption on Diffusion in ZSM-5 Molecular Sieve[J]. CIESC Journal, 1991, (6).
DOI：

梁五更, 陈诵英, 彭少逸. Effect of Irreversible Adsorption on Diffusion in ZSM-5 Molecular Sieve[J]. CIESC Journal, 1991, (6). DOI：

摘要

不可逆吸附是指在一定条件下

经长时间抽空或吹扫脱附仍脱不出去的那部分吸附质

它们在催化反应中起着十分重要的作用.在沸石分子筛中

由于存在特殊的孔道结构

而使不可逆吸附的作用更大;且可设想

不可逆吸附对其中的扩散将有很大的影响.

Abstract

The effect of irreversible adsorption of cyclohexane

ethylbenzene

ortho-xylene and n-octane on diffusion in ZSM-5 molecular sieve was investigated by gravimetric method. For the above system

the ratios of diffusivities between two cases of with and without irreversible adsorption are: cyclohexane: 3.6(348K)

ethylbenzene: 4.8(398K)

1.6(423K)

ortho-xylene: 2.6(423K)

n-octane: 12.3(398K). It shows that the diffusivity is increased by irreversible adsorption. This effect can be explained by the covering of the strong adsorptive sites with irreversible adsorbates

which decreases diffusional resistance and increases diffusivity.

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