Effects of temperature on adsorption mechanism and adsorption selectivity of C3H6 and C3H8 on MOF-74(Ni)

LIU Jiang; WU Yufang; XU Feng; XIAO Jing; XIA Qibin; LI Zhong

doi:10.11949/j.issn.0438-1157.20151519

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Effects of temperature on adsorption mechanism and adsorption selectivity of C₃H₆ and C₃H₈ on MOF-74(Ni)

更新时间：2025-12-10

- Effects of temperature on adsorption mechanism and adsorption selectivity of C₃H₆ and C₃H₈ on MOF-74(Ni)
- CIESC Journal Issue 5, Pages: 1942-1948(2016)
- 作者机构：
  
  华南理工大学化学与化工学院,广东,广州,510640
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20151519
  CLC： Q028.1TB34
- Online First：05 May 2016，
  
  Published：05 May 2016
- 稿件说明：
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LIU Jiang, WU Yufang, XU Feng, et al. Effects of temperature on adsorption mechanism and adsorption selectivity of C₃H₆ and C₃H₈ on MOF-74(Ni)[J]. CIESC Journal, 2016, (5): 1942-1948. DOI: 10.11949/j.issn.0438-1157.20151519.
DOI：

LIU Jiang, WU Yufang, XU Feng, et al. Effects of temperature on adsorption mechanism and adsorption selectivity of C₃H₆ and C₃H₈ on MOF-74(Ni)[J]. CIESC Journal, 2016, (5): 1942-1948. DOI: 10.11949/j.issn.0438-1157.20151519. DOI：

摘要

采用水热法成功制备了MOF-74(Ni)

使用PXRD、孔径分析对材料进行了表征

测定了材料在不同温度下的C3H6和C3H8吸附等温线

应用程序升温脱附技术估算了脱附活化能

并使用IAST理论预测了材料对C3H6/C3H8二元体系的吸附选择性。讨论了温度对吸附机理和吸附选择性的影响。结果显示

MOF-74(Ni)的BET比表面积高达1306 m2·g-1。在298 K下

C3H6的吸附量高达7.4 mmol·g-1。随着温度升高

C3H8的吸附量大幅降低

而C3H6的吸附量下降程度较小

导致材料对C3H6/C3H8吸附选择性升高。当温度为328K时

MOF-74(Ni)对C3H6/C3H8二元气体混合物的吸附选择接近12。程序升温脱附的实验结果显示

C3H6在MOF-74(Ni)上的脱附活化能大于C3H8

分别为68.92 kJ·mol-1和50.80 kJ·mol-1。C3H6是通过与MOF-74(Ni)的不饱和金属位点Ni2+以p络合作用方式吸附

作用力较强

而C3H8与Ni2+之间的作用力较弱。根据吸附机理不同的特点

适当提高温度

将有助于提高MOF-74(Ni)吸附分离C3H6/C3H8混合物体系的吸附选择性。

Abstract

MOF-74(Ni) was synthesized by solvothermal synthesis method and then characterized by PXRD and pore size analysis. Isotherms of C3H6 and C3H8 on the synthesized MOF-74(Ni) were measured at different temperatures. The temperature programmed desorption experiments were conducted to estimate the desorption activation energies of C3H6 and C3H8 on the MOF-74(Ni). IAST theory was applied to predict the adsorption selectivity of C3H6/C3H8 mixture. The effects of temperature on adsorption mechanism and adsorption selectivity were also discussed. Results showed that the as-synthesized MOF-74(Ni) had BET surfaces of 1306 m2·g-1

and its C3H6 adsorption capacity was up to 7.4 mmol·g-1 at 298 K. With rising temperature

the adsorption capacity of C3H8 on MIL-74(Ni) decreased sharply

while that of C3H6 decreased slightly

resulting in improvement of C3H6/C3H8 adsorption selectivity of MOF-74(Ni). It could be attributed to p-complexation bonding between C3H6 and MOF-74(Ni)

which was stronger than the interaction of C3H8 with MOF-74(Ni). TPD results indicated that the desorption activation energy of C3H6 on MOF-74(Ni) was higher than that of C3H8

which were 68.92 kJ·mol-1 and 50.80 kJ·mol-1

respectively.

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