Continuous process of the vacuum ultraviolet- (VUV-) photochemical oxidation of thiophene in the gas phase

2015 ◽  
Vol 14 (5) ◽  
pp. 1013-1024 ◽  
Author(s):  
Haingo L. Andriampanarivo ◽  
Martin Köhler ◽  
Juan López Gejo ◽  
Thomas Betzwieser ◽  
Benny C. Y. Poon ◽  
...  
Keyword(s):  
Gas Phase ◽  
Kinetic Data ◽  
Oxidation Reaction ◽  
Vacuum Ultraviolet ◽  
Continuous Process ◽  
Oxidative Degradation ◽  
Photochemical Oxidation ◽  
Reaction Pathways ◽  
Intermediate Products

Based on kinetic data and intermediate products of oxidation, reaction pathways of the oxidative degradation of gaseous thiophene are discussed.

Vacuum-UV- (VUV-) Photochemically Initiated Oxidation of Dimethylamine in the Gas Phase

2008 ◽  
Vol 11 (2) ◽  
Author(s):  
Fouad Fethi ◽  
Juan López-Gejo ◽  
Martin Köhler ◽  
André M. Braun
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Oxidative Degradation ◽  
Product Distribution ◽  
Photochemical Oxidation ◽  
Experimental Conditions ◽  
On Line ◽  
Vacuum Uv

AbstractThe vacuum ultraviolet (VUV-) photochemical oxidation of dimethylamine in the gas phase was investigated in the presence and absence of molecular oxygen and water vapor. Primary intermediate products of the oxidative degradation were identified by the combination of gas chromatography and mass spectrometry (GC/MS), and the product distribution was determined for different experimental conditions. The evolution of the substrate concentration was followed by on-line gas chromatography. The production of CO

Simultaneous photochemical generation of ozone in the gas phase and photolysis of aqueous reaction systems using one VUV light source

1997 ◽  
Vol 35 (4) ◽  
pp. 41-48 ◽  
Author(s):  
T.M. Hashem ◽  
M. Zirlewagen ◽  
A. M. Braun
Keyword(s):  
Gas Phase ◽  
Light Source ◽  
Organic Pollutants ◽  
Vacuum Ultraviolet ◽  
Oxidative Degradation ◽  
Reaction System ◽  
Photochemical Reactions ◽  
Experimental Conditions ◽  
Photochemical Generation ◽  
Kinetics Of

A more efficient use of vacuum ultraviolet (VUV) radiation produced by an immersed Xe-excimer light source (172 nm) was investigated for the oxidative degradation of organic pollutants in aqueous systems. All emitted VUV radiation from one light source was used in two simultaneous but separate photochemical reactions: (1) photochemical generation of ozone by irradiating oxygen in the gas phase and (2) photolysis of the aqueous reaction system. The gas stream containing the generated ozone is sparged into the reaction system, thus enhancing the oxidative degradation of organic pollutants. The photochemically generated ozone in the gas phase was quantitatively analyzed, and the kinetics of the degradation of 4-chlorophenol (4-CP) and of the dissolved organic carbon (DOC) were determined under different experimental conditions. The results show that the rates of degradation of the substrate and of the DOC decrease in the order of the applied processes, VUV/O3 > O3 > VUV.

Reesterification of ethyl acetate by propanol catalysed by glycidyl methacrylate copolymers containing sulphonic acid groups

1981 ◽  
Vol 46 (8) ◽  
pp. 1941-1946 ◽  
Author(s):  
Karel Setínek
Keyword(s):  
Liquid Phase ◽  
Ethyl Acetate ◽  
Kinetic Study ◽  
Gas Phase ◽  
Nonlinear Regression ◽  
Kinetic Data ◽  
Glycidyl Methacrylate ◽  
Kinetic Equations ◽  
Methacrylate Copolymers ◽  
Styrene Divinylbenzene

A series of differently crosslinked macroporous 2,3-epoxypropyl methacrylate-ethylenedimethacrylate copolymers with chemically bonded propylsulphonic acid groups were used as catalysts for the kinetic study of reesterification of ethyl acetate by n-propanol in the liquid phase at 52 °C and in the gas phase at 90 °C. Analysis of kinetic data by the method of nonlinear regression for a series of equations of the Langmuir-Hinshelwood type showed that kinetic equations which describe best the course of the reaction are the same as for the earlier studied sulphonated macroporous styrene-divinylbenzene copolymers. Compared types of catalysts differ, however, in the dependence of their activity on the degree of crosslinking of the copolymer used.

Photofragmentation of gas-phase acetic acid and acetamide clusters in the vacuum ultraviolet region

2017 ◽  
Vol 147 (19) ◽  
pp. 194302 ◽  
Author(s):  
Marta Berholts ◽  
Hanna Myllynen ◽  
Kuno Kooser ◽  
Eero Itälä ◽  
Sari Granroth ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Vacuum Ultraviolet Region

scholarly journals Evaluated kinetic and photochemical data for atmospheric chemistry: Volume II – reactions of organic species

2005 ◽  
Vol 5 (4) ◽  
pp. 6295-7168 ◽  
Author(s):  
R. Atkinson ◽  
D. L. Baulch ◽  
R. A. Cox ◽  
J. N. Crowley ◽  
R. F. Hampson ◽  
...  
Keyword(s):  
Kinetic Parameters ◽  
Gas Phase ◽  
Atmospheric Chemistry ◽  
Kinetic Data ◽  
Photochemical Reactions ◽  
Data Evaluation ◽  
Organic Species ◽  
Summary Sheet

Abstract. This article, the second in the series, presents kinetic and photochemical data evaluated by the IUPAC Subcommittee on Gas Kinetic Data Evaluation for Atmospheric Chemistry. It covers the gas phase and photochemical reactions of Organic species, which were last published in 1999, and were updated on the IUPAC website in late 2002. The article consists of a summary sheet, containing the recommended kinetic parameters for the evaluated reactions, and eight appendices containing the data sheets, which provide information upon which the recommendations are made.

scholarly journals Differences in the Catalytic Behavior of Au-Metalized TiO2 Systems During Phenol Photo-Degradation and CO Oxidation

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 331 ◽  
Author(s):  
Oscar Laguna ◽  
Julie Murcia ◽  
Hugo Rojas ◽  
Cesar Jaramillo-Paez ◽  
Jose Navío ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Gas Phase ◽  
Noble Metal ◽  
Oxidation Reaction ◽  
Considerable Increase ◽  
Deposition Time ◽  
Phenol Degradation ◽  
Photo Degradation ◽  
Co Oxidation Reaction ◽  
Phenol Conversion

For this present work, a series of Au-metallized TiO2 catalysts were synthesized and characterized in order to compare their performance in two different catalytic environments: the phenol degradation that occurs during the liquid phase and in the CO oxidation phase, which proceeds the gas phase. The obtained materials were analyzed by different techniques such as XRF, SBET, XRD, TEM, XPS, and UV-Vis DRS. Although the metallization was not totally efficient in all cases, the amount of noble metal loaded depended strongly on the deposition time. Furthermore, the differences in the amount of loaded gold were important factors influencing the physicochemical properties of the catalysts, and consequently, their performances in the studied reactors. The addition of gold represented a considerable increase in the phenol conversion when compared with that of the TiO2, despite the small amount of noble metal loaded. However, this was not the case in the CO oxidation reaction. Beyond the differences in the phase where the reaction occurred, the loss of catalytic activity during the CO oxidation reaction was directly related to the sintering of the gold nanoparticles.

scholarly journals Isoquinoline gas-phase absorption spectrum in the vacuum ultraviolet between 3.7 and 10.7 eV. New valence and Rydberg electronic states

RSC Advances ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 5121-5141 ◽  
Author(s):  
Sydney Leach ◽  
Nykola C. Jones ◽  
Søren V. Hoffmann ◽  
Sun Un
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Electronic States ◽  
Synchrotron Source

VUV photons from a synchrotron source were used to record the gas-phase absorption spectrum of isoquinoline over the range 3.5 to 10.7 eV.

ChemInform Abstract: The Acidity of Chloro-Substituted Benzenes: A Comparison of Gas Phase, ab initio, and Kinetic Data.

ChemInform ◽  
2010 ◽  
Vol 33 (5) ◽  
pp. no-no
Author(s):  
Manfred Schlosser ◽  
Elena Marzi ◽  
Fabrice Cottet ◽  
Heinz H. Bueker ◽  
Nico M. M. Nibbering
Keyword(s):  
Ab Initio ◽  
Gas Phase ◽  
Kinetic Data ◽  
Substituted Benzenes
Sign in / Sign up

Export Citation Format

Share Document