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Li T, Chen S, Li J, Zhu Q, Li Z. Accurate Kinetics of Cyclization Reactions of the Large-Size Hydroperoxy Methyl-Ester Radicals Investigated by the Isodesmic Reaction Correction Method. J Phys Chem A 2023; 127:10253-10267. [PMID: 38015153 DOI: 10.1021/acs.jpca.3c06089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
The cyclization reactions of hydroperoxymethylester radicals are pivotal in low-temperature methyl-ester combustion but limited experimental and theoretical kinetic data pose challenges. Prior research has drawn upon analogous hydroperoxy alkyl radical cyclization reactions to approximate rate constants and might inaccurately represent ester group-specific behavior. This study systematically investigates these kinetics, accounting for ester group effects and computational complexities in large molecular systems. The reactions are categorized into 11 classes based on cyclic transition state size and -OOH/radical positions. Energy barriers and high-pressure-limit rate constants are calculated using the isodesmic reaction correction method, validated, and applied to 24 subclasses based on carbon sites connected to -OOH and radical moieties. Subclass high-pressure-limit rate rules are derived through averaging rate constants. Analysis reveals uncertainties within acceptable chemical accuracy limits, validating the reaction classification and rate rules. We conduct comparative analyses with values from analogous alkyl reactions in established mechanisms while comparing our results with the high-pressure-limit rate rules for analogous alkane reactions. These comparisons reveal notable disparities, emphasizing the ester group's influence and necessitating tailored ester-specific rate rules. These findings hold promise for improving automatic reaction mechanism generation, particularly for large methyl esters.
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Affiliation(s)
- Tao Li
- School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, P. R. China
| | - Siyu Chen
- School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, P. R. China
| | - Juanqin Li
- School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, P. R. China
| | - Quan Zhu
- School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, P. R. China
| | - Zerong Li
- Engineering Research Center of Combustion and Cooling for Aerospace Power, Ministry of Education, Sichuan University, Chengdu, Sichuan 610065, P. R. China
- College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
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Dhahak A, Grimmer C, Neumann A, Rüger C, Sklorz M, Streibel T, Zimmermann R, Mauviel G, Burkle-Vitzthum V. Real time monitoring of slow pyrolysis of polyethylene terephthalate (PET) by different mass spectrometric techniques. WASTE MANAGEMENT (NEW YORK, N.Y.) 2020; 106:226-239. [PMID: 32240939 DOI: 10.1016/j.wasman.2020.03.028] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 03/20/2020] [Accepted: 03/21/2020] [Indexed: 06/11/2023]
Abstract
In the context of waste upgrading of polyethylene terephthalate (PET) by pyrolysis, this study presents three on-line mass spectrometric techniques with soft ionization for monitoring the emitted decomposition products and their thermal dependent evolution profiles. Pyrolysis experiments were performed using a thermogravimetric analyzer (TGA) under nitrogen atmosphere with a heating rate of 5 °C/min from 30 °C to 600 °C. Single-photon ionization (SPI at 118 nm/10.5 eV) and resonance enhanced multiple photon ionization (REMPI at 266 nm) were used with time-of-flight mass spectrometry (TOF-MS) for evolved gas analysis (TGA-SPI/REMPI-TOFMS). Additionally, the chemical signature of the pyrolysis products was investigated by atmospheric pressure chemical ionization (APCI) ultra high resolution Fourier Transform ion cyclotron resonance mass spectrometry (FT-ICR MS) which enables assignment of molecular sum formulas (TGA-APCI FT-ICR MS). Despite the soft ionization by SPI, the fragmentation of some compounds with the loss of the [O-CH = CH2] fragment is observed. The major compounds were acetaldehyde (m/z 44), benzoic acid (m/z 122) and a fragment of m/z 149. Using REMPI, aromatic species were selectively detected. Several series of pyrolysis products were observed in different temperature intervals, showing the presence of polycyclic aromatic hydrocarbons (PAHs), especially at high temperatures. FT-ICR MS data showed, that the CHO4 class was the most abundant compound class with a relative abundance of 45.5%. The major compounds detected with this technique corresponded to m/z 193.0495 (C10H9O4+) and 149.0233 (C8H5O3+). Based on detailed chemical information, bulk reaction pathways are proposed, showing the formation of both cyclic monomer/dimer and linear structures.
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Affiliation(s)
- Asma Dhahak
- Laboratory of Reactions and Process Engineering (LRGP), National Centre for Scientific Research (CNRS), University of Lorraine, National School of Chemical Industries (ENSIC), 1 Rue Grandville, 54000 Nancy, France
| | - Christoph Grimmer
- Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry, University of Rostock, 18059 Rostock, Germany
| | - Anika Neumann
- Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry, University of Rostock, 18059 Rostock, Germany
| | - Christopher Rüger
- Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry, University of Rostock, 18059 Rostock, Germany
| | - Martin Sklorz
- Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry, University of Rostock, 18059 Rostock, Germany; Joint Mass Spectrometry Centre, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München-German Research Center of Environmental Health (GmbH), Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
| | - Thorsten Streibel
- Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry, University of Rostock, 18059 Rostock, Germany; Joint Mass Spectrometry Centre, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München-German Research Center of Environmental Health (GmbH), Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
| | - Ralf Zimmermann
- Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, Institute of Chemistry, University of Rostock, 18059 Rostock, Germany; Joint Mass Spectrometry Centre, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München-German Research Center of Environmental Health (GmbH), Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany
| | - Guillain Mauviel
- Laboratory of Reactions and Process Engineering (LRGP), National Centre for Scientific Research (CNRS), University of Lorraine, National School of Chemical Industries (ENSIC), 1 Rue Grandville, 54000 Nancy, France
| | - Valérie Burkle-Vitzthum
- Laboratory of Reactions and Process Engineering (LRGP), National Centre for Scientific Research (CNRS), University of Lorraine, National School of Chemical Industries (ENSIC), 1 Rue Grandville, 54000 Nancy, France.
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Zhang T, Wen M, Ju Y, Kang J, Wang R, Cao J, Roy SK. Theoretical studies on the mechanism and kinetic for CH3
CH2
O + HO2
and CH3
CHOH + HO2
reactions. J PHYS ORG CHEM 2018. [DOI: 10.1002/poc.3895] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Tianlei Zhang
- Institute of Theoretical and Computational Chemistry, Shaanxi Key Laboratory of Catalysis; Shaanxi University of Technology; Hanzhong Shaanxi China
| | - Mingjie Wen
- Institute of Theoretical and Computational Chemistry, Shaanxi Key Laboratory of Catalysis; Shaanxi University of Technology; Hanzhong Shaanxi China
| | - Yan Ju
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan China
| | - Jiaxin Kang
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering; Henan Normal University; Xinxiang Henan China
| | - Rui Wang
- Institute of Theoretical and Computational Chemistry, Shaanxi Key Laboratory of Catalysis; Shaanxi University of Technology; Hanzhong Shaanxi China
| | - Jia Cao
- College of Chemistry and Chemical Engineering, Shaanxi Key Laboratory of Chemical Reaction Engineering; Yan'an University; Yan'an Shaanxi China
| | - Soumendra K. Roy
- Institute of Theoretical and Computational Chemistry, Shaanxi Key Laboratory of Catalysis; Shaanxi University of Technology; Hanzhong Shaanxi China
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