Preparation of piperazine-grafted amine-functionalized UiO-66 metal organic framework and its application for CO2 over CH4 separation

• Published in: Journal of the Iranian Chemical Society Vol. 14; no. 10; pp. 2247 - 2253
• Main Authors: Vahidi, Mehdi, Rashidi, Ali Morad, Tavasoli, Ahmad
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-10-2017; Springer Nature B.V
• Subjects: Analytical Chemistry; Biochemistry; Carbon dioxide; Chemisorption; Chemistry; Chemistry and Materials Science; Inorganic Chemistry; Organic Chemistry; Original Paper; Physical Chemistry; Selectivity; Methane; UiO-66; Grafted framework; Piperazine; Carbon dioxide
• ISSN: 1735-207X; 1735-2428
• DOI: 10.1007/s13738-017-1161-6

UiO-66 amine functionalized was synthesized by solvothermal method. Post-synthetic modification of UiO-66-NH
2
with piperazine, a known promoter to enhance the chemisorption rate of CO
2
uptake, was carried out and analyzed to understand its crystalline structure, morphology and porous structure. Results show that piperazine is an effective agent for enhancing the capacity of absorption of CO
2
. This porous product exhibits an improved CO
2
uptake at pressures up to 3000 kPa via physisorption and chemisorption mechanisms. The CH
4
adsorption and desorption isotherms on UiO-66, UiO-66-NH
2
and pip-UiO-66-NH
2
at temperature of 298.15 K and pressures ranging from 0 to 5000 kPa were carried out. IAS theory for a mixture of 0.05 bar CO
2
, 0.85 bar CH
4
and 0.1 bar other gas revealed a selectivity factor of 19.09 for CO
2
/CH
4
from pip-UiO-66-NH
2
. Results show that these materials are effective adsorbents for CO
2
and CH
4
uptakes.