https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 Molecular interactions between amine and carbonate species in aqueous solution: kinetics and thermodynamics https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:8135 Wed 18 Nov 2020 13:17:05 AEDT ]]> Reclaiming water from a direct air capture plant using vacuum membrane distillation – A bench-scale study https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:52767 Tue 14 Nov 2023 15:12:48 AEDT ]]> An equilibrium study of carbamate formation relevant to post combustion capture of CO₂ https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:12186 Tue 11 Dec 2018 14:36:58 AEDT ]]> A systematic investigation of carbamate stability constants by ¹H NMR https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:18149 Sat 24 Mar 2018 08:04:41 AEDT ]]> Comprehensive kinetic and thermodynamic study of the reactions of CO2(aq) and HCO3− with monoethanolamine (MEA) in aqueous solution https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17531 2(aq) and monoethanolamine (MEA) has been investigated using stopped-flow spectrophotometry by following the pH changes during the reactions with colored acid–base indicators. Multivariate global analysis of both the forward and backward kinetic measurements for the reaction of CO₂(aq) with MEA yielded the rate and equilibrium constants, including the protonation constant of MEA carbamate, for the temperature range of 15–45 °C. Analysis of the rate and equilibrium constants in terms of the Arrhenius, Eyring, and van’t Hoff relationships gave the relevant thermodynamic parameters. In addition, the rate and equilibrium constants for the slow, reversible reaction of bicarbonate with MEA are reported at 25.0 °C. At high pH, reactions of the amine with CO₂ and with bicarbonate are significant.]]> Sat 24 Mar 2018 08:03:56 AEDT ]]> Reactions of CO₂ with aqueous piperazine solutions: formation and decomposition of mono- and dicarbamic acids/carbamates of piperazine at 25.0 degrees °C https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19664 Sat 24 Mar 2018 08:01:10 AEDT ]]> Kinetics of the reversible reaction of CO2(aq) with ammonia in aqueous solution https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:17954 Sat 24 Mar 2018 07:56:27 AEDT ]]> Toward the understanding of chemical absorption processes for post-combustion capture of carbon dioxide: electronic and steric considerations from the kinetics of reactions of CO₂(aq) with sterically hindered amines https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:19716 Sat 24 Mar 2018 07:53:45 AEDT ]]> Protonation constants and thermodynamic properties of amines for post combustion capture of CO₂ https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25635 10K_prot) of selected series of primary, secondary and tertiary alkanolamines/amines over the temperature range 288–318 K are reported. Selected series studied involve primary, secondary and tertiary mono-, di- and tri-alkanolamines, secondary amines including heterocyclic species, and both –CH₂OH and –CH₂CH₂OH substituted piperidines. van’t Hoff analyses have resulted in the standard molar enthalpies, ΔH_m^o, and molar entropies, ΔS_m^o, of protonation. Trends in ΔH_m^o are correlated with systematic changes in composition and structure of the selected series of amines/alkanolamines, while ΔH_m^o–ΔS_m^o plots generated linear correlations for the mono-, di-, and tri-alkanolamines, the –CH₂OH and –CH₂CH₂OH substituted piperidines, and the alkylamines. These relationships provide a guide to the selection of an amine(s) solvent for CO₂ capture, based on a greater difference in log₁₀K_prot between the absorber and stripper temperatures.]]> Sat 24 Mar 2018 07:28:09 AEDT ]]> Investigations of primary and secondary amine carbamate stability by ¹H NMR spectroscopy for post combustion capture of carbon dioxide https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:25642 o_m, and entropies, ΔS^o_m of carbamate formation. A ΔH^o_m - ΔS^o_m plot generates a linear correlation for carbamate formation (providing a mean standard molar free energy, ΔG^o_m for carbamate formation of about -7kJ · mol^-1), and this relationship helps provide a guide to the selection of an amine(s) solvent for CO₂ capture, in terms of enthalpy considerations. A linear ΔH^o_m - ΔS^o_m plot also occurs for carbamate protonation. The formation of the carbamates has been correlated with systematic changes in composition and structure, and steric effects have been identified by comparing molecular geometries obtained using density functional B3LYP/6-311++G(d,p) calculations. Trends in steric effects have been identified in the series of compounds monoethanolamine (MEA), 1-amino-2-propanol, 2-amino-1-propanol (AP) and 2-amino-2-methyl-1-propanol (AMP). In the case of 2-piperidinemethanol, 2-piperidineethanol and 3-piperidinemethanol, strong intramolecular hydrogen bonding is shown to be the likely cause for lack of carbamate formation, and in the ring systems of pyrrolidine, morpholine, piperidine and thiomorpho- line trends in carbamate formation (as given by K₉) have been correlated with the internal ring angle at the amine nitrogen, as well as the planarity of the environment around the nitrogen atom.]]> Sat 24 Mar 2018 07:28:08 AEDT ]]> Toward rational design of amine solutions for PCC applications: the kinetics of the reaction of CO₂(aq) with cyclic and secondary amines in aqueous solution https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:22247 Sat 24 Mar 2018 07:17:34 AEDT ]]> Activation Volumes for the Hydration Reactions of Carbon Dioxide https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23052 Sat 24 Mar 2018 07:13:50 AEDT ]]>