Effect of Ca<sup>2+</sup> in the Unit Cell of A Zeolites on Adsorption Thermodynamics

董光华; 贾兆昌; 黄伟; 庞先勇

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Effect of Ca²⁺ in the Unit Cell of A Zeolites on Adsorption Thermodynamics

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- Effect of Ca²⁺ in the Unit Cell of A Zeolites on Adsorption Thermodynamics
- A型分子筛单胞内Ca²⁺对吸附热力学的影响
- Vol. 33, Issue 4, Pages: 448-452(2012)
- 作者机构：
  
  1. 晋中职业技术学院煤炭化工系
  2. 太原理工大学化学化工学院
  3. 太原理工大学煤科学与技术山西省和教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
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- Published：2012
- 稿件说明：
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董光华, 贾兆昌, 黄伟, et al. Effect of Ca²⁺ in the Unit Cell of A Zeolites on Adsorption Thermodynamics[J]. 2012, 33(4): 448-452.
DOI：

董光华, 贾兆昌, 黄伟, et al. Effect of Ca²⁺ in the Unit Cell of A Zeolites on Adsorption Thermodynamics[J]. 2012, 33(4): 448-452. DOI：

摘要

采用反相气相色谱法测定了N2和CO在6种单胞内Ca2+数量不同的A型分子筛的吸附热力学参数(ΔadH

ΔadS和ΔadG)

其中N2和CO的吸附热分别在-12.08～-17.25 kJ·mol-1和-18.20～-25.95 kJ·mol-1范围内

吸附熵分别在-31.96～-42.68 J·mol-1K-1和-40.23～-56.45 J·mol-1K-1范围内

吉布斯自由能变在-3.35～-5.59 kJ·mol-1和-7.21～-10.53 kJ·mol-1范围内

吸附热、熵和自由能变在数值上都随着分子筛单胞内钙数量的增加而增加.结合钙交换后分子筛内电荷分布及孔道变化阐明了这些数据变化的原因

Abstract

The adsorption thermodynamic parameters(ΔadH

ΔadS and ΔadG) of N2 and CO on A zeolites of different the number of Ca2+ in unit cell have been evaluated by inverse gas chromatography.The adsorption heat of N2 and CO ranged from-12.08 kJ·mol-1 to-17.25 kJ·mol-1 and from-18.20 to-25.95 kJ·mol-1

the adsorption entropy of N2 and CO ranged from-31.96 J·mol-1·K-1 to-42.68 J·mol-1·K-1 and from-40.23 J·mol-1·K-1 to-56.45 J·mol-1·K-1

the Gibbs free energy of N2 and CO ranged from-3.35 kJ·mol-1 to-5.59 kJ·mol-1 and from-7.21 kJ·mol-1 to-10.53 kJ·mol-1

respectively.The results show that the values of the adsorption heat

adsorption entropy and the Gibbs free energy decreased with the increasing of the number of Ca2+.The varation was explained being caused by the changing of charge distribution in the zeolites and the aperture after Na+ was exchanged by Ca2+.

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references

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Effect of Ca2+ in the Unit Cell of A Zeolites on Adsorption Thermodynamics

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摘要

Abstract

关键词

Keywords

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Effect of Ca²⁺ in the Unit Cell of A Zeolites on Adsorption Thermodynamics