The Experts below are selected from a list of 462 Experts worldwide ranked by ideXlab platform
Erdoğan Alper - One of the best experts on this subject based on the ideXlab platform.
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kinetics of carbon dioxide binding by 1 1 3 3 tetramethylguanidine in 1 hexanol
International Journal of Greenhouse Gas Control, 2014Co-Authors: Mustafa Cagdas Ozturk, Ozge Yuksel Orhan, Erdoğan AlperAbstract:Abstract Switchable solvents, also known as the carbon dioxide-binding organic liquids (CO 2 BOLs), are novel solvents featuring the ability to switch between polar and non-polar states, opening a wide range of applications, such as combined synthesis and product separation. In addition, these solvents have very suitable properties for carbon dioxide capture, such as low heat capacities, high boiling points, higher physical and chemical absorption capacities and reversible fixation of carbon dioxide. In this study, kinetic analysis of one of these solvent systems, 1,1,3,3-tetramethylguanidine (TMG) in 1-hexanol, was performed so as to enable the design of experiments and absorber models. The Reaction mechanism was determined to comply with Termolecular Reaction mechanism and pseudo-first order behavior was observed in excess TMG and 1-hexanol. The activation energy of the Reaction was also reported.
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Reaction mechanism and kinetics of 1 8 diazabicyclo 5 4 0 undec 7 ene and carbon dioxide in alkanol solutions
Chemical Engineering & Technology, 2012Co-Authors: Mustafa Cagdas Ozturk, C S Ume, Erdoğan AlperAbstract:Carbon dioxide-binding organic liquids (CO2BOL) are a new class of solvents with advantageous properties such as high boiling points, low specific heats, high absorption capacities, and easily reversible Reactions. In order to implement these solvents in processes, the Reaction characteristics must be determined a priori. This work presents an analysis of the rate constants and activation energies of the Reaction between carbon dioxide and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in 1-hexanol and 1-propanol. The Reactions were found to comply with a Termolecular Reaction mechanism and exhibited pseudo-first-order behavior in the presence of excess DBU and 1-alkanol. It was concluded that DBU-based CO2BOL are environmentally friendly and easy-to-handle solvents that may provide great flexibility and improvements over conventional carbon dioxide absorption processes.
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Reaction mechanism and kinetics of aqueous solutions of 2 amino 2 methyl 1 3 propanediol and carbonyl sulphide
Turkish Journal of Chemistry, 2001Co-Authors: Erdoğan AlperAbstract:The mechanism and kinetics of the Reaction between aqueous solutions of COS and a sterically hindered primary amine, 2-amino-2-methyl-1,3-propanediol (AMPD), were investigated at 288-303 K using a stopped-flow technique. It was found that the Reaction order according to power law kinetics was between 1.12 and 1.16 for an amine concentration range of 0.5 to 1.5 kmol m-3 . This overall order indicated that the thiocarbamate formation was complex and possibly involved a zwitterion intermediate. However, the experimental results can also be explained in terms of a single-step Termolecular Reaction mechanism. The kinetic rate parameters for aqueous AMPD solutions were obtained for 288 to 303 K and over the concentration range of 0.5 - 1.5 kmol m-3 of AMPD.
Murray J Mcewan - One of the best experts on this subject based on the ideXlab platform.
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An ICR study of ion-molecules Reactions relevant to titan’s atmosphere: An investigation of binary hydrocarbon mixtures up to 1 Micron
Journal of The American Society for Mass Spectrometry, 2006Co-Authors: Vincent G. Anicich, Paul F. Wilson, Murray J McewanAbstract:Results are reported for studies of binary mixtures of hydrocarbons exposed to low-energy electron impact ionization. A variety of experimental methods are used: conventional ICR mass spectrometry, the standard double resonance in an ICR for determination of the precursor ions, and the modulated double resonance ejection in an ICR for the determination of the daughter ions. A flowing afterglow-selected ion flow tube experiment (FA-SIFT) was used for validation and examination of Termolecular Reactions. An extensive database of Reaction kinetics already exists for many of these Reactions. The main point of this study was the determination of the accuracy of this database and the identification of missing Reactions and Reaction channels. An effort was made to extend the study to the highest pressures possible to determine if any important Termolecular Reaction channels were present that were not recognized in earlier investigations. A new approach was used here. In the binary mixtures of hydrocarbon gases, mass spectra were obtained as a function of independent pressure changes of both gases. All the mass peaks in the spectra were fitted using existing kinetic data as a starting point. A model of the ion abundances was then produced from the solution of the partial differential equations derived from the kinetics in terms of Reaction rate coefficients and initial abundances. The model was fitted to the data for all of the pressures by a least-squares fit to the Reaction rate coefficients and initial abundances. The kinetic parameters were then adjusted if required.
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Termolecular ion-molecule Reactions in Titan’s atmosphere. IV. A search made at up to 1 micron in pure hydrocarbons
Journal of the American Society for Mass Spectrometry, 2003Co-Authors: Vincent G. Anicich, Paul Wilson, Murray J McewanAbstract:The results of a study of ion-molecule Reactions occurring in pure methane, acetylene, ethylene, ethane, propyne, propene, propane, and diacetylene at pressures up to 40 microns of pressure are reported. A variety of experimental methods are used: The standard double resonance in an ICR, for determination of the precursor ions and the modulated double resonance ejection in an ICR, for the determination of the daughter ions. The FA-SIFT technique was used for validation and examination of Termolecular Reactions with rate coefficients that are less than 10^−26 cm^6 s^−1. An extensive database of Reaction kinetics already exists for many of these Reactions. The main point of this study was the determination of the accuracy of this database and to search for any missing Reactions and Reaction channels that may have been omitted from earlier investigations. A specific objective of this work was to extend the study to the highest pressures possible to find out if there were any important Termolecular Reaction channels occurring. A new approach was used here. In the pure hydrocarbon gases the mass spectra were followed as a function of the pressure changes of the gas. An initial guess was first made using the current literature as a source of the Reaction kinetics that were expected. A model of the ion abundances was produced from the solution of the partial differential equations in terms of Reaction rate coefficients and initial abundances. The experimental data was fitted to the model for all of the pressures by a least squares minimization to the Reaction rate coefficients and initial abundances. The Reaction rate coefficients obtained from the model were then compared to the literature values. Several new channels and Reactions were discovered when the modeled fits were compared to the actual data. This is all explained in the text and the implications of these results are discussed for the Titan atmosphere.
John N Crowley - One of the best experts on this subject based on the ideXlab platform.
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kinetics of the oh no 2 Reaction rate coefficients 217 333 k 16 1200 mbar and fall off parameters for n 2 and o 2 bath gases
Atmospheric Chemistry and Physics, 2019Co-Authors: Damien Amedro, Arne J C Bunkan, Matias Berasategui, John N CrowleyAbstract:Abstract. The radical terminating, Termolecular Reaction between OH and NO2 exerts great influence on the NOy∕NOx ratio and O3 formation in the atmosphere. Evaluation panels (IUPAC and NASA) recommend rate coefficients for this Reaction that disagree by as much as a factor of 1.6 at low temperature and pressure. In this work, the title Reaction was studied by pulsed laser photolysis and laser-induced fluorescence over the pressure range 16–1200 mbar and temperature range 217–333 K in N2 bath gas, with experiments at 295 K (67–333 mbar) for O2 . In situ measurement of NO2 using two optical absorption set-ups enabled generation of highly precise, accurate rate coefficients in the fall-off pressure range, appropriate for atmospheric conditions. We found, in agreement with previous work, that O2 bath gas has a lower collision efficiency than N2 with a relative collision efficiency to N2 of 0.74. Using the Troe-type formulation for Termolecular Reactions we present a new set of parameters with k0 ( N2 ) = 2.6 × 10 - 30 cm 6 molecule −2 s −1 , k0 ( O2 ) = 2.0 × 10 - 30 cm 6 molecule −2 s −1 , m=3.6 , k ∞ = 6.3 × 10 - 11 cm 3 molecule −1 s −1 , and Fc=0.39 and compare our results to previous studies in N2 and O2 bath gases.
Vincent G. Anicich - One of the best experts on this subject based on the ideXlab platform.
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An ICR study of ion-molecules Reactions relevant to titan’s atmosphere: An investigation of binary hydrocarbon mixtures up to 1 Micron
Journal of The American Society for Mass Spectrometry, 2006Co-Authors: Vincent G. Anicich, Paul F. Wilson, Murray J McewanAbstract:Results are reported for studies of binary mixtures of hydrocarbons exposed to low-energy electron impact ionization. A variety of experimental methods are used: conventional ICR mass spectrometry, the standard double resonance in an ICR for determination of the precursor ions, and the modulated double resonance ejection in an ICR for the determination of the daughter ions. A flowing afterglow-selected ion flow tube experiment (FA-SIFT) was used for validation and examination of Termolecular Reactions. An extensive database of Reaction kinetics already exists for many of these Reactions. The main point of this study was the determination of the accuracy of this database and the identification of missing Reactions and Reaction channels. An effort was made to extend the study to the highest pressures possible to determine if any important Termolecular Reaction channels were present that were not recognized in earlier investigations. A new approach was used here. In the binary mixtures of hydrocarbon gases, mass spectra were obtained as a function of independent pressure changes of both gases. All the mass peaks in the spectra were fitted using existing kinetic data as a starting point. A model of the ion abundances was then produced from the solution of the partial differential equations derived from the kinetics in terms of Reaction rate coefficients and initial abundances. The model was fitted to the data for all of the pressures by a least-squares fit to the Reaction rate coefficients and initial abundances. The kinetic parameters were then adjusted if required.
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Termolecular ion-molecule Reactions in Titan’s atmosphere. IV. A search made at up to 1 micron in pure hydrocarbons
Journal of the American Society for Mass Spectrometry, 2003Co-Authors: Vincent G. Anicich, Paul Wilson, Murray J McewanAbstract:The results of a study of ion-molecule Reactions occurring in pure methane, acetylene, ethylene, ethane, propyne, propene, propane, and diacetylene at pressures up to 40 microns of pressure are reported. A variety of experimental methods are used: The standard double resonance in an ICR, for determination of the precursor ions and the modulated double resonance ejection in an ICR, for the determination of the daughter ions. The FA-SIFT technique was used for validation and examination of Termolecular Reactions with rate coefficients that are less than 10^−26 cm^6 s^−1. An extensive database of Reaction kinetics already exists for many of these Reactions. The main point of this study was the determination of the accuracy of this database and to search for any missing Reactions and Reaction channels that may have been omitted from earlier investigations. A specific objective of this work was to extend the study to the highest pressures possible to find out if there were any important Termolecular Reaction channels occurring. A new approach was used here. In the pure hydrocarbon gases the mass spectra were followed as a function of the pressure changes of the gas. An initial guess was first made using the current literature as a source of the Reaction kinetics that were expected. A model of the ion abundances was produced from the solution of the partial differential equations in terms of Reaction rate coefficients and initial abundances. The experimental data was fitted to the model for all of the pressures by a least squares minimization to the Reaction rate coefficients and initial abundances. The Reaction rate coefficients obtained from the model were then compared to the literature values. Several new channels and Reactions were discovered when the modeled fits were compared to the actual data. This is all explained in the text and the implications of these results are discussed for the Titan atmosphere.
Mustafa Cagdas Ozturk - One of the best experts on this subject based on the ideXlab platform.
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kinetics of carbon dioxide binding by 1 1 3 3 tetramethylguanidine in 1 hexanol
International Journal of Greenhouse Gas Control, 2014Co-Authors: Mustafa Cagdas Ozturk, Ozge Yuksel Orhan, Erdoğan AlperAbstract:Abstract Switchable solvents, also known as the carbon dioxide-binding organic liquids (CO 2 BOLs), are novel solvents featuring the ability to switch between polar and non-polar states, opening a wide range of applications, such as combined synthesis and product separation. In addition, these solvents have very suitable properties for carbon dioxide capture, such as low heat capacities, high boiling points, higher physical and chemical absorption capacities and reversible fixation of carbon dioxide. In this study, kinetic analysis of one of these solvent systems, 1,1,3,3-tetramethylguanidine (TMG) in 1-hexanol, was performed so as to enable the design of experiments and absorber models. The Reaction mechanism was determined to comply with Termolecular Reaction mechanism and pseudo-first order behavior was observed in excess TMG and 1-hexanol. The activation energy of the Reaction was also reported.
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Reaction mechanism and kinetics of 1 8 diazabicyclo 5 4 0 undec 7 ene and carbon dioxide in alkanol solutions
Chemical Engineering & Technology, 2012Co-Authors: Mustafa Cagdas Ozturk, C S Ume, Erdoğan AlperAbstract:Carbon dioxide-binding organic liquids (CO2BOL) are a new class of solvents with advantageous properties such as high boiling points, low specific heats, high absorption capacities, and easily reversible Reactions. In order to implement these solvents in processes, the Reaction characteristics must be determined a priori. This work presents an analysis of the rate constants and activation energies of the Reaction between carbon dioxide and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in 1-hexanol and 1-propanol. The Reactions were found to comply with a Termolecular Reaction mechanism and exhibited pseudo-first-order behavior in the presence of excess DBU and 1-alkanol. It was concluded that DBU-based CO2BOL are environmentally friendly and easy-to-handle solvents that may provide great flexibility and improvements over conventional carbon dioxide absorption processes.