Chemical speciation of CO2 absorption in aqueous monoethanolamine investigated by in situ Raman spectroscopy

Wong, Mee Kee; Bustam, Mohamad Azmi; Shariff, Azmi Mohd

doi:10.1016/j.ijggc.2015.05.016

Cited by 53 publications

(36 citation statements)

References 31 publications

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“…3a and b. The bonds at 1018 cm −1 , 1068 cm −1 , and 1160 cm −1 are attributed to C–OH stretching of HCO 3 − , symmetric C–O stretching of CO 3 2− , and C–N stretching of RNHCO 2 − , respectively 17 . The peak height of RNHCO 2 − generated under catalytic condition reached its highest point more quickly than that without use of the catalyst.…”

Section: Resultsmentioning

confidence: 97%

Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

et al. 2018

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Implementing Paris Climate Accord is inhibited by the high energy consumption of the state-of-the-art CO2 capture technologies due to the notoriously slow kinetics in CO2 desorption step of CO2 capture. To address the challenge, here we report that nanostructured TiO(OH)2 as a catalyst is capable of drastically increasing the rates of CO2 desorption from spent monoethanolamine (MEA) by over 4500%. This discovery makes CO2 capture successful at much lower temperatures, which not only dramatically reduces energy consumption but also amine losses and prevents emission of carcinogenic amine-decomposition byproducts. The catalytic effect of TiO(OH)2 is observed with Raman characterization. The stabilities of the catalyst and MEA are confirmed with 50 cyclic CO2 sorption and sorption. A possible mechanism is proposed for the TiO(OH)2-catalyzed CO2 capture. TiO(OH)2 could be a key to the future success of Paris Climat e Accord.

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Section: Resultsmentioning

confidence: 97%

Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

et al. 2018

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“…Loading increases with increasing CO 2 partial pressure due to the number of collisions between the CO 2 gas molecules and surface of aqueous BZA + AEEA solvents increasing causing more gas molecule to penetrate, and loading increases due to more CO 2 is dissolved . At higher CO 2 partial pressure (>100 kPa), it is observed that the slope of CO 2 loading increases slowly due to stoichiometric saturation of chemical absorption and loading mostly governs by physical absorption at this pressure range.…”

Section: Resultsmentioning

confidence: 97%

Experimental measurements and modelling of CO₂ solubility in aqueous mixtures of benzylamine and N‐(2‐aminoethyl) ethanolamine

Mukherjee

Bandyopadhyay

Samanta

2018

Asia-Pacific J Chem Eng

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In this work, carbon dioxide solubility in N-(2-aminoethyl) ethanolamine (AEEA) activated aqueous benzylamine (BZA) solutions are studied using a stirred-cell reactor in the temperature and pressure range of 313.15-333.15 K and 0.2-219 kPa, respectively. AEEA is a linear diamine with a primary and secondary amine groups, and BZA is a primary cyclic amine. The concentration of the aqueous blends used are (20mass% BZA + 10mass% AEEA), (24mass% BZA + 6mass% AEEA), and (28mass% BZA + 2mass% AEEA).Density and viscosity of unloaded aqueous amine blends are also measured in experimental temperature and concentration ranges and correlated using Joubian-Acree mathematical model. Model-predicted density and viscosity data are in good agreement with experimental results showing 0.05% and 3.41% AAD, respectively. To correlate experimental vapor-liquid-equilibrium data, Kent-Eisenberg (KE), artificial neural network (ANN), and soft models are used. Equilibrium constants of monocarbamate formation reaction of BZA and AEEA are regressed as a function of temperature and CO 2 loading to fit the experimental data with KE model expression. KE model is also utilized to estimate the pH of CO 2 loaded aqueous amine solutions. ANN model is found to predict CO 2 solubility with better accuracy (1.56% AAD) in comparison of KE model (8.27% AAD) and soft model (15.5%). The CO 2 absorption capacity of (20mass% BZA + 10mass% AEEA) solvent (~0.8 mol CO 2 /mol amine) is higher than that of monoethanolamine (~0.5 mol CO 2 /mol amine).Heats of absorption values of (BZA + AEEA) solvents (~25 kJ/mol CO 2 ) predicted from Gibbs-Helmholtz relationship are found to be lower than that of MEA (~87 kJ/mol CO 2 ) and PZ (~66 kJ/mol CO 2 ).

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“…ILs that have one or more amino groups can reportedly chemisorb 0.5 to 2 CO 2 molecules per 1 ion pair of IL at ambient pressure . The mechanism of the chemisorption has much in common with that of molecular amines; the key reaction is carbamate formation between the amine and CO 2 ,. ILs that are derived from strongly basic anion are also reported.…”

Section: Introductionmentioning

confidence: 99%

Role of Hydrogen‐Bond Interactions in CO₂ Capture by Wet Phosphonium Formate Ionic Liquid: A Raman Spectroscopic Study

2018

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The mechanism of CO absorption by a formate ionic liquid, [P ]HCOO, was studied by Raman spectroscopy. The band area for the symmetric CO stretching of the formate anion linearly decreases with the CO loading. From the slope of the decrease, 1 : 1 stoichiometry is proven between CO and the formate anion. The result favors the mechanism we proposed in a preceding work [J. Chem. Eng. Data 61, 837 (2016)]: HCOO +CO +H O→HCOOH+HCO →[HCOOH…HCO ]. Further support for the mechanism is obtained by the observation of antisymmetric vibration of CO for the proposed hydrogen-bonded complex between HCOOH and HCO . The bands appeared as a doublet (1677 and 1730 cm ) as this complex has two carbonyl groups. Based on DFT calculations, the [HCOOH…HCO ] complex is supposed to be the most abundant form of chemisorbed CO .

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Chemical speciation of CO2 absorption in aqueous monoethanolamine investigated by in situ Raman spectroscopy

Cited by 53 publications

References 31 publications

Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

Experimental measurements and modelling of CO₂ solubility in aqueous mixtures of benzylamine and N‐(2‐aminoethyl) ethanolamine

Role of Hydrogen‐Bond Interactions in CO₂ Capture by Wet Phosphonium Formate Ionic Liquid: A Raman Spectroscopic Study

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Chemical speciation of CO2 absorption in aqueous monoethanolamine investigated by in situ Raman spectroscopy

Cited by 53 publications

References 31 publications

Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

Catalyst-TiO(OH)2 could drastically reduce the energy consumption of CO2 capture

Experimental measurements and modelling of CO2 solubility in aqueous mixtures of benzylamine and N‐(2‐aminoethyl) ethanolamine

Role of Hydrogen‐Bond Interactions in CO2 Capture by Wet Phosphonium Formate Ionic Liquid: A Raman Spectroscopic Study

Contact Info

Product

Resources

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Experimental measurements and modelling of CO₂ solubility in aqueous mixtures of benzylamine and N‐(2‐aminoethyl) ethanolamine

Role of Hydrogen‐Bond Interactions in CO₂ Capture by Wet Phosphonium Formate Ionic Liquid: A Raman Spectroscopic Study