2 edition of Kinetic studies of gas phase ozonolysis and photo-oxidation reactions. found in the catalog.
Kinetic studies of gas phase ozonolysis and photo-oxidation reactions.
Michael Robert Williams
Thesis (Ph.D.)-University of Birmingham, Dept of Chemistry.
Environmental context Acetate esters, emitted into the atmosphere from both natural and anthropogenic sources, can participate in photochemical processes leading to the formation of secondary organic aerosols. We report a study on the kinetics and mechanisms of the reaction of two acetate esters with O3, OH, NO3, and Cl radicals. The results help our understanding of the chemical behaviour of The kinetic multi-layer model for gas-particle interactions in aerosols and clouds (KM-GAP) of Shiraiwa and coworkers explicitly includes gas-phase diffusion, adsorption and desorption from the surface, surface reactions, bulk transport and reaction, and evaporation and condensation processes. 17 This model has been applied to a number of
contribution method. Particle phase and heterogeneous reactions are generally neglected, but the impact of peroxyhemiacetal formation in the aerosol is tested on the basis of laboratory estimates of the reaction rates. The model is evaluated against 28 laboratory experiments from 6 studies of a-pinene photo-oxidation covering a wide range of and 10 for reactions with 2-MPE and 2-EPE, respectively. The effects of the alkoxy group on the gas-phase reactivity of alkyl vinyl ethers toward ozone are compared and discussed. The major ozonolysis products are methyl acetate, formaldehyde and CO2 for 2-MPE, and ethyl acetate, formaldehyde and CO2 for 2-EPE. Possible mechanisms
Abstract. Methyl vinyl ketone (MVK) is a key first-generation product from atmospheric isoprene photo-oxidation, especially under high-NO x conditions. In this work, acid-catalyzed reactions of gas-phase MVK with ammonium sulfate (AS), ammonium bisulfate (ABS), and sulfuric acid (SA) particles were investigated in a flow reaction system at relative humidity (RH) of 40 % and 80 %. The main focus herein is to summarize newly published aqueous‐phase kinetic data on OH, NO 3 and SO 4 − radical reactions relevant for the description of multiphase tropospheric chemistry. The data compilation builds up on earlier datasets published in the ://
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Space Shuttle Propellant Constituive Law Verification Tests, Final Technical Report, James R. Thompson, Thiokol Corp, 31 March, 1995.
The gas-phase reactions of NO3 radicals with series of 1-alkenes, dienes, cycloalkenes, alkenols, and alkenals were studied in pure N2 or 20% O2/80% N2 bath gas at room temperature and atmospheric pressure using a relative rates technique.
Rate coefficients were derived from rates of loss of the organic compounds observed using a chemical ionization mass spectrometer. No difference in the Kinetic studies of gas phase ozonolysis and photo-oxidation reactions.
Author: Williams, M. ISNI: Awarding Body: University of Birmingham Current Institution: University of Birmingham Date of Award: Availability of Full Text: ?uin= Kinetics Studies of the Gas-Phase Reactions of NO3 Radicals with Series of 1-Alkenes, Dienes, Cycloalkenes, Alkenols, and Alkenals.
The Journal of Physical Chemistry A(44), DOI: /jpw. Hui-Ming Hung and Chen-Wei :// Kinetic studies on the gas-phase reactions of OH and NO3 radicals and ozone with ethyl vinyl ether (EVE), propyl vinyl ether (PVE) and butyl vinyl ether (BVE) have been performed in a L borosilicate glass chamber at ± 3 K in synthetic air using in situ FTIR spectroscopy to monitor the reactants.
Using a relative kinetic method rate coefficients (in units of cm3 molecule-1 s-1) of (7 Kinetic Study of Gas-Phase Reactions of OH and NO3 Radicals and O3 with iso-Butyl and tert-Butyl Vinyl Ethers. The Journal of Physical Chemistry A(35), DOI: /jpa.
Shouming Zhou, Ian Barnes, Tong Zhu and Thorsten :// The rate constant for the gas-phase reaction of O 3 and Lewisite was studied in air using the smog chamber technique.
The experiments were carried out under pseudo-first-order reaction conditions with [O 3] ≪ [Lewisite].The observed rate constant of O 3 with Lewisite was ( ± ) × 10 − 19 cm 3 / (moleculesec) at ± 2 K. Lewisite was discussed in terms of reactivity with O 3 Little quantitative information exists regarding the products of the heterogeneous reaction of polycyclic aromatic hydrocarbons (PAHs) and ozone.
We have, therefore, performed the first quantitative study investigating the kinetics and products of the heterogeneous gas−surface reaction of anthracene and ozone as a function of ozone concentration and relative humidity (RH).
This book presents recent advances in the field and includes the following topics: the oxidation of simple organic compounds, NOx kinetics and mechanisms, OH radical production and rate constants for the OH attack on more complex organic compounds, peroxy and alkoxy radical reactions, photo-oxidation of aromatic and biogenic compounds, the The ozonolysis of 2,3,7,8-tetra-chlorodibenzo-p-dioxin (2,3,7,8-TCDD) is an efficient degradation way in the atmosphere.
The ozonolysis process and possible reactions path of Criegee Intermediates The representation of alkene degradation in version 3 of the Master Chemical Mechanism (MCM v3) has been evaluated, using environmental chamber data on the photo-oxidation of ethene, propene, 1-butene and 1-hexene in the presence of NOx, from up to five chambers at the Statewide Air Pollution Research Center (SAPRC) at the University of :// Rate constants for the gas-phase reactions of cisHexenol, cisHexenylacetate, transHexenal, and Linalool with OH and NO3 radicals and O3 at ± 2 K, and OH radical formation yields Hajime Akimoto, Jun Hirokawa, Gas‐Phase Reactions Related to Secondary Organic Aerosols, Atmospheric Multiphase Chemistry, /, (), ().
Wiley Online Library Proposed reaction scheme for the gas phase ozonolysis of 1 pentenol (a), cispentenol (b) and transhexenol (c). The compounds framed with solid lines are detected in the present study whereas the one in the dotted frame corresponds to secondary pathways of the primary :// Vinyl acetate is widely used in industry.
It has been classified as a high-production volume (HPV) chemical in the United States. To evaluate its impact on the environment and air quality, its atmospheric reactivity toward the three main tropospheric oxidants (OH, NO3, and O3) has been investigated.
Kinetic and mechanistic experiments have been conducted at room temperature and Merv Fingas, in Oil Spill Science and Technology, Photo-oxidation.
Photo-oxidation can change the composition of an oil. It occurs when the sun's action on an oil slick causes oxygen and carbons to combine and form new products that may be resins. The resins may be somewhat soluble and dissolve into the water, or they may cause water-in-oil emulsions to :// The gas-phase ozonolysis of α-pinene, Δ3-carene and limonene was investigated at ppb levels and the impact of the ozone, relative air humidity (RH), and time was studied using experimental :// Oxidation and removal of atmospheric constituents involve complex sequences of reactions which can lead to the production of photo-oxidants such as ozone.
In order to understand and model these complex reaction sequences, it is necessary to have a comprehensive understanding of reaction The O 3-initiated oxidation of β-pinene, a monoterpene emitted in forested areas, was theoretically characterized using DFT, CBS-QB3 and CASPT2 quantum chemical calculations combined with statistical kinetic RRKM/master equation analysis and transition state theory.
The first-principles based rate coefficient of the initial O 3 attack on the exocyclic double bond shows a slight positive such reactions, and the kinetic equations for the stationary and nonstationary conditions as a function of the nature of the reaction propagated in the gas phase, as well as the role of the mass transfer processes in the catalyst grain were analysed.
In recent years, the number of studies devoted to Request PDF | Temperature‐dependent kinetic study for ozonolysis of selected tropospheric alkenes | Ozonolysis reactions of alkenes are suggested to play major roles in the chemistry of the.
In the present work, the kinetic measurements for the heterogeneous reactions of gas-phase ozone with 3,4,5-trimethoxybenzaldehyde adsorbed on silicon oxide were performed for a time period Atmospheric oxidation mechanism and kinetic studies for OH and NO3 radical-initiated reaction of methyl methacrylate, Int.
J. Mol. Sci.15 (3), Rui Gao, Fei Xu, Shanqing Li, Jingtian Hu, Qingzhu Zhang *(通讯作者), Wenxing Wang, Formation of bromophenoxy radicals from complete series reactions of bromophenols with H and OH radicals, Chemosphere,92(4) This paper describes the implementation of a kinetic gas-particle partitioning approach used for the simulation of secondary organic aerosol (SOA) formation within the SPectral Aerosol Cloud Chemistry Interaction Model (SPACCIM).
The kinetic partitioning considers the diffusion of organic compounds into aerosol particles and the subsequent chemical reactions in the particle ://