Functionalized UiO-66 by Single and Binary (OH)2 and NO2 Groups for Uptake of CO2 and CH4

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• 作者：Zana Hassan Rada ; Hussein Rasool Abid ; Jin Shang ; Hongqi Sun ; Yingdian He ; Paul Webley ; Shaomin Liu ; Shaobin Wang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：55
• 期：29
• 页码：7924-7932
• 全文大小：629K
• 年卷期：0
• ISSN：1520-5045

文摘

The metal–organic frameworks UiO-66 with single or binary −(OH)₂ and −NO₂ functional groups were synthesized, and their structures and properties were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and nitrogen adsorption isotherms. Their performances in CO₂ and CH₄ adsorption at high pressures and different temperatures (273 and 298 K) were also determined. Singly functionalized UiO-66-(OH)₂ had a lower thermal stability than UiO-66-NO₂, but the thermal stability of binary UiO-66-(OH)₂-NO₂ significantly improved to 650 K. The binary-functionalized samples UiO-66-(OH)₂-NO₂ and UiO-66-NO₂-(OH)₂ displayed higher CH₄ and CO₂ adsorption than UiO-66-(OH)₂ and UiO-66-NO₂. The CO₂ adsorption capacities of UiO-66-(OH)₂-NO₂ and UiO-66-NO₂-(OH)₂ were 4.65 and 7.35 mmol/g, respectively, at 273 K and 900 kPa. UiO-66-(OH)₂ had a higher separation factor for selective separation of CO₂ from CH₄, especially at low pressures up to 100 kPa; the separation factor ranged from 4.9 at about 100 kPa to 5.8 at 60 kPa.