Amine functionalised metal organic frameworks (MOFs) as adsorbents for carbon dioxide

Abstract

Three different porous metal organic framework (MOF) materials have been prepared with and without uncoordinated amine functionalities inside the pores. The materials have been characterized and tested as adsorbents for carbon dioxide. At 298 K the materials adsorb significant amount of carbon dioxide, the amine functionalised adsorbents having the highest CO 2 adsorption capacities, the best adsorbing around 14 wt% CO 2 at 1.0 atm CO 2 pressure. At 25 atm CO 2 pressure, up to 60 wt% CO 2 can be adsorbed. At high pressures the CO 2 uptake is mostly dependent on the available surface area and pore volume of the material in question. For one of the iso-structural MOF pairs the introduction of amine functionality increases the differential adsorption enthalpy (from isosteric method) from 30 to around 50 kJ/mole at low CO 2 pressures, while the adsorption enthalpies reach the same level at increase pressures. The high pressure experimental results indicate that MOF based solid adsorbents can have a potential for use in pressure swing adsorption of carbon dioxide at elevated pressures.

Activation and dissociation of CO2 on the (001), (011), and (111) surfaces of mackinawite (FeS): A dispersion-corrected DFT study

“…1,2 The first step in CO 2 reduction on heterogeneous catalyst surfaces is the activation of the C==O bond and charge transfer for the eventual formation of an anion radical species. 2 A significant number of studies exist in the literature regarding the adsorption, activation, and conversion of CO 2 using both heterogeneous, e.g., on metal/metal oxide surfaces [8][9][10][11] or metal-organic frameworks, [12][13][14][15] and homogeneous reactions, e.g., transition metal complexes. [16][17][18][19][20][21] More recently, transition metal sulfides have attracted significant attention for catalytic applications owing to their low cost, natural abundance, and prominent catalytic features.…”

Analysis of High and Selective Uptake of CO2 in an Oxamide‐Containing {Cu2(OOCR)4}‐Based Metal–Organic Framework

“…[3c,6-10] Nitrogen-containing groups or open metal sites accessible within the pores can improve CO 2 affinity via dipolequadrupole interactions with the CO 2 molecules. [11][12][13][14] We recently described the material NOTT-122 incorporating triazole groups which displays a high adsorption capacity for CO 2 and used a computational approach to investigate the specific interactions between CO 2 and the framework linker heteroatoms. [15] Similarly, Zaworotko et al have reported MOFs [16] containing amide functional groups in the linkers, whereby linking of three isophthalates generated polyhedral structures that exhibit a strong binding affinity to CO 2 .…”

“…S5 The excellent uptake of CO 2 observed in the low pressure isotherms is consistent with the presence of specific CO 2 -amide interactions. There are several potential interactions that can be proposed including dipole-quadrupole interactions of the type described above [11][12][13][14] and hydrogen-bond formation between the amide NH and the oxygens of CO 2 .…”

Comprehensive analysis on the performance of an IGCC plant with a PSA process integrated for CO2 capture

“…Other advantages of activated carbons over zeolites are the lower costs [8] and the higher resistance to water presence in the gas mixture [8,29,30]. Material science is very active in the research of new adsorbents with enhanced characteristics for CO2 separation [31][32][33][34]. Much effort is put in the laboratory tests to develop adsorbents with remarkable performance.…”