1
|
Hutama AS, Marlina LA, Akram MB, Wijaya K, Sari RM, Saputri WD. Atmospheric Degradation Mechanism of Isoamyl Acetate Initiated by OH Radicals and Cl Atoms Revealed by Quantum Chemical Calculations and Kinetic Modeling. J Phys Chem A 2024; 128:8483-8500. [PMID: 39314143 DOI: 10.1021/acs.jpca.4c05204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/25/2024]
Abstract
Isoamyl acetate is one of the volatile organic compound class molecules relevant to agricultural and industrial applications. With the growing interest in isoamyl acetate applications in industry, the atmospheric fate of isoamyl acetate must be considered. Reaction mechanisms, potential energy profiles, and rate constants of isoamyl acetate reaction with atmospheric relevant oxidant OH radicals and Cl atoms have been obtained from the quantum chemical calculations and kinetic modeling. The geometry optimizations were conducted using M06-2X/6-311++G(3df,3pd) followed by single point-energy calculations at the DLPNO-CCSD(T) method with an extrapolated complete basis set. The rate constants were calculated by solving the master equation. A hydrogen-abstraction reaction dominates the first step of isoamyl acetate degradation, while the addition-substitution reaction plays a small role in the degradation products. The kinetic study was conducted to evaluate the rate constants within a temperature range of 200-400 K. The total rate constants for the isoamyl acetate degradation reactions initiated by the OH radical and Cl atom were determined to be 6.96 × 10-12 and 1.27 × 10-10 cm3 molecule-1 s-1, respectively, under standard temperature and pressure conditions. The product degradation mechanism, ozone formation potential, and atmospheric impacts were discussed.
Collapse
Affiliation(s)
- Aulia Sukma Hutama
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta 55281, Indonesia
| | - Lala Adetia Marlina
- Research Center for Computing, National Research and Innovation Agency (BRIN), Cibinong, Bogor 16911, Indonesia
| | - Muhammad Bahy Akram
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta 55281, Indonesia
| | - Karna Wijaya
- Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Gadjah Mada, Sekip Utara, Bulaksumur, Yogyakarta 55281, Indonesia
| | - Reka Mustika Sari
- Research Center for Food Technology and Processing, National Research and Innovation Agency (BRIN), Yogyakarta 55861, Indonesia
| | - Wahyu Dita Saputri
- Research Center for Climate and Atmosphere, National Research and Innovation Agency (BRIN), Bandung 40135, Indonesia
| |
Collapse
|
2
|
Robertson NK, Onel L, Blitz MA, Shannon R, Stone D, Seakins PW, Robertson SH, Kühn C, Pazdera TM, Olzmann M. Temperature-Dependent, Site-Specific Rate Coefficients for the Reaction of OH (OD) with Methyl Formate Isotopologues via Experimental and Theoretical Studies. J Phys Chem A 2024; 128:5028-5040. [PMID: 38885649 PMCID: PMC11215782 DOI: 10.1021/acs.jpca.4c02524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 05/30/2024] [Accepted: 05/30/2024] [Indexed: 06/20/2024]
Abstract
Methyl esters are an important component of combustion and atmospheric systems. Reaction with the OH radical plays an important role in the removal of the simplest methyl ester, methyl formate (MF, CH3OCHO). In this paper, the overall rate coefficients for the reactions of OH and OD with MF isotopologues, studied under pseudo-first-order conditions, are reported using two different laser flash photolysis systems with the decay of OH monitored by laser-induced fluorescence. The room-temperature rate coefficient for OH + MF, (1.95 ± 0.34) × 10-13 cm3 molecule-1 s-1, is in good agreement with the literature. The rate coefficient exhibits curved Arrhenius behavior, and our results bridge the gap between previous low-temperature and shock tube studies. In combination with the literature, the rate coefficient for the reaction of OH with MF between 230 and 1400 K can be parametrized as kOH+MF = (3.2 × 10-13) × (T/300 K)2.3 × exp(-141.4 K/T) cm3 molecule-1 s-1 with an overall estimated uncertainty of ∼30%. The reactions of OD with MF isotopologues show a small enhancement (inverse secondary isotope effect) compared to the respective OH reactions. The reaction of OH/OD with MF shows a normal primary isotope effect, a decrease in the rate coefficient when MF is partially or fully deuterated. Experimental studies have been supported by ab initio calculations at the CCSD(T)-F12/aug-cc-pVTZ//M06-2X/6-31+G** level of theory. The calculated, zero-point-corrected, barrier heights for abstraction at the methyl and formate sites are 1.3 and 6.0 kJ mol-1, respectively, and the ab initio predictions of kinetic isotope effects are in agreement with experiment. Fitting the experimental isotopologue data refines these barriers to 0.9 ± 0.6 and 4.1 ± 0.9 kJ mol-1. The branching ratio is approximately 50:50 at 300 K. Between 300 and 500 K, abstraction via the higher-energy, higher-entropy formate transition state becomes more favored (60:40). However, experiment and calculations suggest that as the temperature increases further, with higher energy, less constrained conformers of the methyl transition state become more significant. The implications of the experimental and theoretical results for the mechanisms of MF atmospheric oxidation and low-temperature combustion are discussed.
Collapse
Affiliation(s)
| | - Lavinia Onel
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Mark A. Blitz
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
- National
Centre for Atmospheric Science, University
of Leeds, Leeds LS2 9JT, U.K.
| | - Robin Shannon
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Daniel Stone
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | - Paul W. Seakins
- School
of Chemistry, University of Leeds, Leeds LS2 9JT, U.K.
| | | | - Christian Kühn
- Institut
für Physikalische Chemie, Karlsruher
Institut für Technologie (KIT), 76131 Karlsruhe, Germany
| | - Tobias M. Pazdera
- Institut
für Physikalische Chemie, Karlsruher
Institut für Technologie (KIT), 76131 Karlsruhe, Germany
| | - Matthias Olzmann
- Institut
für Physikalische Chemie, Karlsruher
Institut für Technologie (KIT), 76131 Karlsruhe, Germany
| |
Collapse
|
3
|
Straccia C VG, Blanco MB, Teruel MA. Hydroxy esters atmospheric degradation: OH and Cl reactivity, products distribution and fate of the alkoxy radicals formed. CHEMOSPHERE 2023; 339:139726. [PMID: 37543227 DOI: 10.1016/j.chemosphere.2023.139726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 07/31/2023] [Accepted: 08/02/2023] [Indexed: 08/07/2023]
Abstract
Kinetic studies of the reaction of ethyl glycolate HOCH2C(O)OCH2CH3 with OH radicals (kOH) and Cl atoms (kCl) have been conducted by the relative method using a glass atmospheric reactor by "in situ" Fourier Transform Infrared (FTIR) and Gas Chromatography equipped with flame ionization detection by Solid Phase Micro Extraction (GC-FID/SPME) at room temperature and atmospheric pressure. The following relative rate coefficients were determined using several reference compounds and two different techniques: kEG + OH-FTIR = (4.36 ± 1.21) × 10-12; kEG + OH-GC-FID= (3.90 ± 0.74) × 10-12; and kEG + Cl-GC-FID= (6.40 ± 0.72) × 10-11 all values in units of cm3.molecule-1.s-1. Complementary product studies were performed under comparable conditions to the kinetic tests, in order to identify the reaction products and to postulate their tropospheric oxidation mechanisms. The reaction of OH radicals and Cl atoms with ethyl glycolate initiates via H-atom abstraction from alkyl groups of the molecule. Formic acid was positively identified as a reaction product by FTIR. On the other hand, formaldehyde, acetaldehyde, glycolic acid; and formic acid were identified by the GC-MS technique. The Structure-Activity Relationship, (SAR) calculations were also implemented to estimate the more favorable reaction pathways and compare them with the products identified. Tropospheric lifetimes of τOH = 34 h and τCl = 5.5 days were estimated to determine how these investigated reactions might affect the air quality. In this sense, average ozone production of [O3] = 0.75 and a Photochemical Ozone Creation Potential, POCP, of 38 were calculated for the hydroxyl ester studied.
Collapse
Affiliation(s)
- Vianni G Straccia C
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - María B Blanco
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina; Institute for Atmospheric and Environmental Research, University of Wuppertal, DE-42097, Wuppertal, Germany
| | - Mariano A Teruel
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina.
| |
Collapse
|
4
|
Rimondino GN, Iriarte AG, Malanca FE. Photo-oxidation of ethyl pyruvate initiated by chlorine atoms. Kinetics and reaction mechanism. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
|
5
|
Mondal K, Kumar A, Rajakumar B. Kinetics of IO radicals with ethyl formate and ethyl acetate: a study using cavity ring-down spectroscopy and theoretical methods. Phys Chem Chem Phys 2021; 23:25974-25993. [PMID: 34783802 DOI: 10.1039/d1cp02615a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The gas-phase kinetics of the reactions of IO radicals with ethyl formate (EF) and ethyl acetate (EA) were investigated experimentally using cavity ring-down spectroscopy (CRDS). IO radicals were generated in situ in the CRD reaction zone by photolyzing a mixture of (CH3I + O3 + N2) at 248 nm and thereby probed at 445.04 nm. The rate coefficients for the reactions (IO + EF) and (IO + EA) were measured at a total pressure of 65 Torr of N2 in the temperature range of 258-358 and 260-360 K, respectively. The rate coefficients for the reactions (IO + EF) and (IO + EA) were measured experimentally at room temperature to be kExpt,298KIO+EF = (3.38 ± 0.67) × 10-14 and kExpt,298KIO+EA = (1.56 ± 0.30) × 10-13 cm3 molecule-1 s-1, respectively. The effects of pressure and photolysis laser fluence on the kinetics of test reactions were found to be negligible within the experimental uncertainties for the studied range. To complement our experimental findings, the kinetics of the title reactions were investigated theoretically using canonical variational transition state theory (CVT) with small curvature tunnelling (SCT) at the CCSD(T)//M06-2X/def2-SV(P) level of theory in temperatures between 200 and 400 K. Very good agreement was observed between the experimentally measured and theoretically calculated rate coefficients for both the reactions at 298 K. The thermochemical parameters as well as the branching ratios for the title reactions are also discussed in this study.
Collapse
Affiliation(s)
- Koushik Mondal
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
| | - Avinash Kumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
| | - B Rajakumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai-600036, India.
| |
Collapse
|
6
|
Straccia C VG, Lugo PL, Rivela CB, Blanco MB, Wiesen P, Teruel MA. OH-initiated degradation of methyl 2-chloroacetoacetate and ethyl 2-chloroacetoacetate: Kinetics, products and mechanisms at 298 K and atmospheric pressure. CHEMOSPHERE 2021; 274:129659. [PMID: 33549882 DOI: 10.1016/j.chemosphere.2021.129659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/11/2021] [Accepted: 01/13/2021] [Indexed: 06/12/2023]
Abstract
Rate coefficients for the gas-phase reactions of OH radicals with CH3C(O)CHClC(O)OCH3 (k1) and CH3C(O)CHClC(O)OCH2CH3 (k2) were measured using the relative technique with different reference compounds. The experiments were performed at (298 ± 2) K and 750 Torr of nitrogen or synthetic air by in situ FTIR spectroscopy and GC-FID chromatography. The following rate coefficients (in units of cm3molecule-1 s-1) were obtained: k1FTIR= (2.70 ± 0.51) × 10-11; k1GC-FID= (2.30 ± 0.71) × 10-11 and k2FTIR= (3.37 ± 0.62) × 10-11; k2GC-FID= (3.26 ± 0.85) × 10-11. This work reports the first kinetic study for the reactions of OH radicals with the mentioned chloroacetoacetates. Additionally, product studies are reported in similar conditions of the kinetic experiments. Acetic acid, acetaldehyde, formyl chloride, and methyl 2-chloro-2-oxoacetate were positively identified and quantified as degradation products. According to the identified products, atmospheric chemical mechanisms were proposed. The environmental implications of these reactions were assessed by the tropospheric lifetimes calculations of the title chloroesters. Significant average ozone production of 4.16 ppm for CH3C(O)CHClC(O)OCH3 and 5.98 ppm for CH3C(O)CHClC(O)OCH2CH3, respectively were calculated.
Collapse
Affiliation(s)
- Vianni G Straccia C
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Pedro L Lugo
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Cynthia B Rivela
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Maria B Blanco
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina
| | - Peter Wiesen
- Institute for Atmospheric and Environmental Research, University of Wuppertal, DE-42097, Wuppertal, Germany
| | - Mariano A Teruel
- (L.U.Q.C.A), Laboratorio Universitario de Química y Contaminación del Aire, Instituto de Investigaciones en Fisicoquímica de Córdoba (I.N.F.I.Q.C.), Dpto. de Fisicoquímica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000, Córdoba, Argentina.
| |
Collapse
|
7
|
Mahmoud MA, Shiroudi A, Abdel-Rahman MA, Shibl MF, Abdel-Azeim S, El-Nahas AM. Structures, energetics, and kinetics of H-atom abstraction from methyl propionate by molecular oxygen: Ab initio and DFT investigations. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2020.113119] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
|
8
|
Kaipara R, Rajakumar B. Cl Atom-Initiated Photo-Oxidation Reactions of Vinyl Trifluoroacetate and Allyl Trifluoroacetate in Tropospheric Conditions. J Phys Chem A 2020; 124:2123-2139. [DOI: 10.1021/acs.jpca.9b11166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Revathy Kaipara
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - B. Rajakumar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| |
Collapse
|
9
|
Rimondino GN, Peláez WJ, Malanca FE. Atmospheric Photo-oxidation of Diethyl Carbonate: Kinetics, Products, and Reaction Mechanism. J Phys Chem A 2020; 124:56-62. [PMID: 31800246 DOI: 10.1021/acs.jpca.9b09887] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The rate coefficient for the gas phase of diethyl carbonate with chlorine atoms has been determined at 298 K using a relative method, employing ethyl formate and ethyl acetate as reference compounds. The experimental value, (1.0 ± 0.2) × 10-11 cm3 molecule-1 s-1, is in good correlation with the one estimated by the SAR (Structure-Activity Relationship) method. The photo-oxidation mechanism of diethyl carbonate initiated by chlorine atoms was also studied at 298 K and atmospheric pressure as a function of the oxygen partial pressure. The main products identified by infrared spectroscopy were CH3CH2OC(O)OCHO, CH3CH2OC(O)OCH2CHO, CH3CH2OC(O)OC(O)CH3, CO2, CO, HCOOH, and CH3COOH. The results reveal that the oxidation process occurs by the abstraction of a hydrogen atom from the methyl (43%) and methylene (57%) groups. The relative importance of each reaction path from the primary radicals formed in photo-oxidation and the identity of CH3CH2OC(O)OCHO, CH3CH2OC(O)OC(O)CH3, and CH3CH2OC(O)OCH2CHO were determined using computational methods. The activation energy of reaction paths for the main oxygenated radicals formed during photo-oxidation was determined using Gaussian09 Program.
Collapse
Affiliation(s)
- Guido N Rimondino
- INFIQC - CONICET - Instituto de Investigaciones en Fisicoquímica de Córdoba, Departamento de Fisicoquímica, Facultad de Ciencias Químicas , Universidad Nacional de Córdoba , Ciudad Universitaria (X5000HUA) , Córdoba , República Argentina
| | - Walter J Peláez
- INFIQC - CONICET - Instituto de Investigaciones en Fisicoquímica de Córdoba, Departamento de Fisicoquímica, Facultad de Ciencias Químicas , Universidad Nacional de Córdoba , Ciudad Universitaria (X5000HUA) , Córdoba , República Argentina
| | - Fabio E Malanca
- INFIQC - CONICET - Instituto de Investigaciones en Fisicoquímica de Córdoba, Departamento de Fisicoquímica, Facultad de Ciencias Químicas , Universidad Nacional de Córdoba , Ciudad Universitaria (X5000HUA) , Córdoba , República Argentina
| |
Collapse
|
10
|
Gupta P, Rajakumar B. Cl Atoms and OH Radicals Initiated Kinetic and Mechanistic Study on the Degradation of Propyl Butanoate under Tropospheric Conditions. J Phys Chem A 2019; 123:10976-10989. [PMID: 31789521 DOI: 10.1021/acs.jpca.9b09546] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactivity of various OVOCs (mainly esters) in the troposphere leads to the generation of various organics, which in turn leads to an increase in the cloud acidity of the Earth's atmosphere. Hence, it becomes necessary to understand the mechanistic aspects of the reaction of these molecules with dominant atmospheric agents. In this study, the tropospheric degradation of one such ester, propyl butanoate (PB; CH3CH2CH2COOCH2CH2CH3) was studied with OH radicals and Cl atoms at the CCSD(T)//M06-2x/6-311+G(2d,2p) and CCSD(T)//BHandHLYP/6-311+G(2d,2p) level of theories over the studied temperature range of 200-400 K. The Arrhenius expressions obtained using the CVT/SCT/ISPE method were calculated as kPB + Cl (200-400 K) = 1.3 × 10-14 T1.3 exp[1335/T] cm3 molecule-1 s-1 and kPB + OH (200-400 K) = 1.8 × 10-26 T4.6 exp[4469/T] cm3 molecule-1 s-1. The obtained kinetics was also well validated against the SAR (structure-activity relationship)-based rate coefficients. The most prominent H-abstraction reaction channels were investigated for the PB + OH/Cl reaction. The abstraction of H atoms attached to the carbon atom present in the β-position to the ester (-C(O)O-) functionality was found to go via the lowest energy activation barriers for the reaction of PB toward both OH radicals and Cl atoms. The product degradation channels were also elucidated in an O2/NOx-rich environment. Moreover, to gauge the impact of the emitted PB on the troposphere, atmospheric lifetimes, radiative efficiencies, global warming potentials, and photochemical ozone creation potentials were also calculated and are included in the manuscript.
Collapse
Affiliation(s)
- Parth Gupta
- Department of Chemistry , Indian Institute of Technology, Madras , Chennai 600036 , India
| | - Balla Rajakumar
- Department of Chemistry , Indian Institute of Technology, Madras , Chennai 600036 , India
| |
Collapse
|
11
|
Mahmoud MAM, El-Demerdash SH, Gogary TMEL, El-Nahas AM. Oxidation of Methyl Propanoate by the OH Radical. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2018. [DOI: 10.1134/s0036024418120294] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
12
|
Balan RC, Balla R. Cl-initiated photo-oxidation reactions of methyl propionate in atmospheric condition. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:20999-21010. [PMID: 29766432 DOI: 10.1007/s11356-018-2062-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 04/17/2018] [Indexed: 06/08/2023]
Abstract
Cl-initiated photo-oxidation reaction of methyl propionate was investigated experimentally using relative rate method. Gas chromatography/mass spectrometry (GC-MS) and GC/infrared spectroscopy (GC-IR) were used as analytical tools to follow the concentrations of reactants and products during reaction. The gas-phase kinetics of methyl propionate with Cl atoms was measured over the temperature range of 263-363 K at 760 Torr in N2 atmosphere using C2H6 and C2H4 as reference compounds. The temperature-dependent rate coefficient for the reaction of methyl propionate with Cl atom was obtained as k(T) = [(3.25 ± 1.23) × 10-16] T2 exp [- (33 ± 4) / T] cm3 molecule-1 s-1. Theoretical calculations were also performed at CCSD(T)/cc-pVDZ//B3LYP/6-31G(d,p) level of theory, and the rate coefficients for H abstraction reactions were evaluated using canonical variational transition state theory (CVT/SCT) with interpolated single point energy (ISPE) method over the temperature range of 200-400 K. The rate coefficients over the studied temperature range yielded the Arrhenius expression k(T) = (7.22 × 10-16) T1.5 exp (466 / T) cm3 molecule-1 s-1. The reaction mechanism based on product analysis, thermochemistry, branching ratios, atmospheric implications, degradation pathways, and cumulative lifetime of methyl propionate is also presented in this manuscript. Graphical abstract ᅟ.
Collapse
Affiliation(s)
| | - Rajakumar Balla
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India.
| |
Collapse
|
13
|
Sandhiya L, Ponnusamy S, Senthilkumar K. Atmospheric oxidation mechanism of OH-initiated reactions of diethyl ether – the fate of the 1-ethoxy ethoxy radical. RSC Adv 2016. [DOI: 10.1039/c6ra14801h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The 1-ethoxy ethoxy radical resulting from the secondary peroxy chemistry in the oxidation of diethyl ether (DEE) by hydroxyl radical leads to the formation of ethyl formate in major quantities and ethyl acetate in minor quantities.
Collapse
Affiliation(s)
- L. Sandhiya
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
| | - S. Ponnusamy
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
| | - K. Senthilkumar
- Department of Physics
- Bharathiar University
- Coimbatore – 641 046
- India
| |
Collapse
|
14
|
Tan T, Yang X, Ju Y, Carter EA. Ab initio kinetics studies of hydrogen atom abstraction from methyl propanoate. Phys Chem Chem Phys 2016; 18:4594-607. [DOI: 10.1039/c5cp07282d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The kinetics of hydrogen abstraction by five radicals (H, CH3, O(3P), OH, and HO2) from a biodiesel surrogate, methyl propanoate (MP), is theoretically investigated.
Collapse
Affiliation(s)
- Ting Tan
- Department of Chemistry
- Princeton University
- Princeton
- USA
| | - Xueliang Yang
- Department of Mechanical and Aerospace Engineering
- Princeton University
- Princeton
- USA
| | - Yiguang Ju
- Department of Mechanical and Aerospace Engineering
- Princeton University
- Princeton
- USA
| | - Emily A. Carter
- Department of Mechanical and Aerospace Engineering
- Princeton University
- Princeton
- USA
- Program in Applied and Computational Mathematics
| |
Collapse
|
15
|
Srinivasulu G, Rajakumar B. Gas Phase Kinetics of 2,2,2-Trifluoroethylbutyrate with the Cl Atom: An Experimental and Theoretical Study. J Phys Chem A 2015; 119:9294-306. [DOI: 10.1021/acs.jpca.5b03961] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- G. Srinivasulu
- Department
of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| | - B. Rajakumar
- Department
of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India
| |
Collapse
|
16
|
Ifang S, Benter T, Barnes I. Reactions of Cl atoms with alkyl esters: kinetic, mechanism and atmospheric implications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:4820-4832. [PMID: 24809490 DOI: 10.1007/s11356-014-2913-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 04/14/2014] [Indexed: 06/03/2023]
Abstract
Rate coefficients have been measured for the reaction of Cl atoms with a series of alkyl esters at 298 ± 2 K and atmospheric pressure in a large volume photoreactor using the relative kinetic technique. The kinetic data have been used in conjunction with other literature studies on the reactions of Cl atoms with esters to revise the existing values for ester substituent factors in a structure activity relationship (SAR) for Cl reactions. Product studies are reported for the reactions of Cl atoms with isopropyl ethanoate and methyl-2-methyl-propanoate under NO x -free conditions. These studies highlight the types of products that can be expected when oxidation occurs at R groups on the acyl (-C(O)OR) and oxy (RC(O)O-) sides of the ester functionality where R is a straight or branched chain alkyl entity. Possible atmospheric repercussions of the atmospheric chemistry of esters are considered.
Collapse
Affiliation(s)
- Stefanie Ifang
- FB C - Department of Physical Chemistry, University of Wuppertal, Gauss Strasse 20, 42119, Wuppertal, Germany
| | | | | |
Collapse
|
17
|
Tan T, Yang X, Ju Y, Carter EA. Ab initio pressure-dependent reaction kinetics of methyl propanoate radicals. Phys Chem Chem Phys 2015; 17:31061-72. [DOI: 10.1039/c5cp06004d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unimolecular dissociation and isomerization kinetics of the three methyl propanoate (MP) radicals, CH3CH2C(O)OĊH2 (MP-m), CH3ĊHC(O)OCH3 (MP-α), and ĊH2CH2C(O)OCH3 (MP-β), are theoretically investigated using high-level ab initio methods and the Rice–Ramsperger–Kassel–Marcus (RRKM)/master equation (ME) theory.
Collapse
Affiliation(s)
- Ting Tan
- Department of Chemistry
- Princeton University
- Princeton
- USA
| | - Xueliang Yang
- Department of Mechanical and Aerospace Engineering
- Princeton University
- Princeton
- USA
| | - Yiguang Ju
- Department of Mechanical and Aerospace Engineering
- Princeton University
- Princeton
- USA
| | - Emily A. Carter
- Department of Mechanical and Aerospace Engineering
- Princeton University
- Princeton
- USA
- Program in Applied and Computational Mathematics
| |
Collapse
|
18
|
Zhao Y, Sun X, Wang W, Xu L. Quantum chemical study on the atmospheric photooxidation of ethyl acetate. CAN J CHEM 2014. [DOI: 10.1139/cjc-2014-0199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The mechanism for OH radical initiated atmospheric photoxidation reaction of ethyl acetate was carried out by using the density functional theory method. Geometries have been optimized at the B3LYP level with a standard 6-31G(d,p) basis set. The single-point energy calculations have been performed at the MP2/6-31G(d), MP2/6-311++G(d,p), and CCSD(T)/6-31G(d) levels, respectively. All of the possible degradation channels involved in the oxidation of ethyl acetate by OH radicals have been presented and discussed. Among the five possible hydrogen abstraction pathways of the reaction of ethyl acetate with OH radicals, the hydrogen abstractions from the C1–H3 and C2–H5 bonds are the dominant reaction pathways due to the low potential barriers and strong exothermicity. The β-ester rearrangement of IM6 is energetically favorable but is not expected to be important. The α-ester rearrangement reaction and O2 direct abstraction from IM17 are the more favorable pathways and are strongly competitive. In addition, the α-ester rearrangement reaction is confirmed to be a one-step process. Acetic acid, formic acetic anhydride, acetoxyacetaldehyde, and acetic anhydride are the main products for the reaction of ethyl acetate with OH radicals.
Collapse
Affiliation(s)
- Yan Zhao
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P.R. China
- School of Life Sciences, Qufu Normal University, Qufu, 273165, P.R. China
| | - Xiaomin Sun
- Environment Research Institute, Shandong University, Jinan 250100, P.R. China
| | - Wenxing Wang
- Environment Research Institute, Shandong University, Jinan 250100, P.R. China
| | - Laixiang Xu
- School of Life Sciences, Qufu Normal University, Qufu, 273165, P.R. China
| |
Collapse
|
19
|
Mishra BK, Chakrabartty AK, Deka RC. A computational perspective on the kinetics and thermochemistry of the gas phase reactions of 1, 1-dichlorodimethylether (DCDME) with OH radical at 298 K. Mol Phys 2013. [DOI: 10.1080/00268976.2013.842008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | | | - Ramesh Chandra Deka
- Department of Chemical Sciences, Tezpur University, Tezpur Napaam, Assam, India
| |
Collapse
|
20
|
Theoretical study on the kinetics and branching ratios of the gas phase reactions of 4,4,4-trifluorobutanal (TFB) with OH radical in the temperature range of 250–400K and atmospheric pressure. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.06.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
21
|
A theoretical investigation on the kinetics and reactivity of the gas-phase reactions of ethyl chlorodifluoroacetate with OH radical and Cl atom at 298 K. Struct Chem 2013. [DOI: 10.1007/s11224-013-0312-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
22
|
Poutsma ML. Evolution of Structure–Reactivity Correlations for the Hydrogen Abstraction Reaction by Hydroxyl Radical and Comparison with That by Chlorine Atom. J Phys Chem A 2013; 117:6433-49. [DOI: 10.1021/jp404749z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marvin L. Poutsma
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee
37831-6197, United States
| |
Collapse
|
23
|
Theoretical investigation of the gas-phase reactions of CF2ClC(O)OCH3 with the hydroxyl radical and the chlorine atom at 298 K. J Mol Model 2013; 19:3263-70. [DOI: 10.1007/s00894-013-1865-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2013] [Accepted: 04/19/2013] [Indexed: 10/26/2022]
|
24
|
Poutsma ML. Evolution of Structure–Reactivity Correlations for the Hydrogen Abstraction Reaction by Chlorine Atom. J Phys Chem A 2013; 117:687-703. [DOI: 10.1021/jp310970t] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Marvin L. Poutsma
- Chemical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee
37831-6197, United States
| |
Collapse
|
25
|
Elm J, Jørgensen S, Bilde M, Mikkelsen KV. Ambient reaction kinetics of atmospheric oxygenated organics with the OH radical: a computational methodology study. Phys Chem Chem Phys 2013; 15:9636-45. [DOI: 10.1039/c3cp50192b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Andersen VF, Ørnsø KB, Jørgensen S, Nielsen OJ, Johnson MS. Atmospheric Chemistry of Ethyl Propionate. J Phys Chem A 2012; 116:5164-79. [DOI: 10.1021/jp300897t] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vibeke F. Andersen
- Copenhagen Center for Atmospheric
Research (CCAR), Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København
Ø, Denmark
| | - Kristian B. Ørnsø
- Copenhagen Center for Atmospheric
Research (CCAR), Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København
Ø, Denmark
| | - Solvejg Jørgensen
- Copenhagen Center for Atmospheric
Research (CCAR), Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København
Ø, Denmark
| | - Ole John Nielsen
- Copenhagen Center for Atmospheric
Research (CCAR), Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København
Ø, Denmark
| | - Matthew S. Johnson
- Copenhagen Center for Atmospheric
Research (CCAR), Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København
Ø, Denmark
| |
Collapse
|