Investigating the possibility of using acetic acid in place of HF in chromium-benzenedicarboxylates (MIL-53 and MIL-101) synthesis applicable for CO2 adsorption

¹Chemical Engineering Department, College of Engineering, University of Isfahan, Hezarjerib, Isfahan, P.O. Box 81746-73441, Iran

²Chemical Engineering Department, College of Petroleum & Gas, University of  Shiraz, Molasadra, Shiraz, P.O. Box 71348-51154, Iran

³Department of Chemistry, Catalysis Division, University of Isfahan, Hezarjerib, Isfahan, P.O. Box 81746-73441, Iran 

Adv. Mater. Lett., 2019, 10 (8), pp 604-609

DOI: 10.5185/amlett.2019.2280

Publication Date (Web): Jan 14, 2019

Copyright © IAAM-VBRI Press

E-mail: mrtalaiekh@yahoo.com  

Abstract

The present study concerns chromium benzenedicarboxylates MIL-53 and MIL-101 hydrothermal syntheses utilizing acetic acid, and their capabilities for CO₂ adsorption. The effect of the parameters such as reaction time, reaction temperature, water concentration, and acetic acid content on adsorption characteristics of these metal-organic frameworks (MOFs) is investigated using L8 Taguchi experimental design. In synthesized MIL-101, with adding 1 acetic acid equivalent with respect to Cr, reaction time and temperature have been reduced from 24 h and 483 K to 6 h and 463 K. Also, the CO₂ adsorption capacity has been measured by a volumetric method. The results have revealed that adding acetic acid and reducing water in the reaction mixture results in converting MIL-101 to MIL-53 which tends to an increase in CO₂ adsorption. With regard to reaction conditions, the results show that MIL-53 and MIL-101 have the maximum CO₂ adsorption capacities of 17.5 and 11.0 mmolg^-1 at 3.5 bar and 299.2 K, respectively.  © VBRI Press.

Keywords

MIL-53, MIL-101, acetic acid, CO₂ adsorption.