Photocatalytic degradation of methyl parathion: Reaction pathways and intermediate reaction products

2007 ◽  
Vol 186 (1) ◽  
pp. 71-84 ◽  
Author(s):  
Edgar Moctezuma ◽  
Elisa Leyva ◽  
Gabriela Palestino ◽  
Hugo de Lasa
Keyword(s):  
Photocatalytic Degradation ◽  
Methyl Parathion ◽  
Reaction Pathways ◽  
Reaction Products ◽  
Intermediate Reaction

scholarly journals Gasification Pathways and Reaction Mechanisms of Primary Alcohols in Supercritical Water

2019 ◽  
Author(s):  
Brian Pinkard ◽  
John Kramlich ◽  
Igor V. Novosselov
Keyword(s):  
Free Radical ◽  
Supercritical Water ◽  
Reaction Mechanisms ◽  
Radical Reaction ◽  
Water Environment ◽  
Waste To Energy ◽  
Reaction Pathways ◽  
Free Radical Reaction ◽  
Reaction Products ◽  
Primary Alcohols

<div> <p></p><p>Supercritical water gasification is a promising waste-to-energy technology with the ability to convert aqueous and/or heterogeneous organic feedstocks to high-value gaseous products. Reaction behavior of complex molecules in supercritical water can be inferred through knowledge of the reaction pathways of model compounds in supercritical water. In this study methanol, ethanol, and isopropyl alcohol are gasified in a continuous supercritical water reactor at temperatures between 500 and 560 °C, and for residence times between 3 and 8 s. <i>In situ</i> Raman spectroscopy is used to rapidly identify and quantify reaction products. The results suggest the dominance of chain-branching, free radical reaction mechanisms that are responsible for decomposing primary alcohols in the supercritical water environment. The presence of a catalytic surface is proposed to be highly significant for initiating radical reactions. Global reaction pathways are proposed, and mechanisms for free radical reaction initiation, propagation, and termination are discussed in light of these and previously published experimental results.</p><br><p></p></div>

scholarly journals Gasification Pathways and Reaction Mechanisms of Primary Alcohols in Supercritical Water

2019 ◽  
Author(s):  
Brian Pinkard ◽  
John Kramlich ◽  
Igor V. Novosselov
Keyword(s):  
Free Radical ◽  
Supercritical Water ◽  
Reaction Mechanisms ◽  
Radical Reaction ◽  
Water Environment ◽  
Waste To Energy ◽  
Reaction Pathways ◽  
Free Radical Reaction ◽  
Reaction Products ◽  
Primary Alcohols

<div> <p></p><p>Supercritical water gasification is a promising waste-to-energy technology with the ability to convert aqueous and/or heterogeneous organic feedstocks to high-value gaseous products. Reaction behavior of complex molecules in supercritical water can be inferred through knowledge of the reaction pathways of model compounds in supercritical water. In this study methanol, ethanol, and isopropyl alcohol are gasified in a continuous supercritical water reactor at temperatures between 500 and 560 °C, and for residence times between 3 and 8 s. <i>In situ</i> Raman spectroscopy is used to rapidly identify and quantify reaction products. The results suggest the dominance of chain-branching, free radical reaction mechanisms that are responsible for decomposing primary alcohols in the supercritical water environment. The presence of a catalytic surface is proposed to be highly significant for initiating radical reactions. Global reaction pathways are proposed, and mechanisms for free radical reaction initiation, propagation, and termination are discussed in light of these and previously published experimental results.</p><br><p></p></div>

scholarly journals Novel reaction products from simple organic reactions: Delineation of reaction pathways

1996 ◽  
Vol 68 (3) ◽  
pp. 739-742 ◽  
Author(s):  
S. C. Jain ◽  
S. Talwar ◽  
Sunita Bhagat ◽  
V. K. Raiwanshi ◽  
R. Kumar ◽  
...  
Keyword(s):  
Organic Reactions ◽  
Reaction Pathways ◽  
Reaction Products

Photocatalytic degradation of commercial methyl parathion in aqueous suspension containing La‐doped TiO2nanoparticles

2011 ◽  
Vol 32 (13) ◽  
pp. 1515-1522 ◽  
Author(s):  
Hao Chen ◽  
Min Shen ◽  
Ruiwen Chen ◽  
Ke Dai ◽  
Tianyou Peng
Keyword(s):  
Photocatalytic Degradation ◽  
Methyl Parathion ◽  
Aqueous Suspension ◽  
La Doped

Photocatalytic degradation of the fungicide Fenhexamid in aqueous TiO2 suspensions: Identification of intermediates products and reaction pathways

Chemosphere ◽  
2011 ◽  
Vol 83 (3) ◽  
pp. 367-378 ◽  
Author(s):  
D.A. Lambropoulou ◽  
I.K. Konstantinou ◽  
T.A. Albanis ◽  
A.R. Fernández-Alba
Keyword(s):  
Photocatalytic Degradation ◽  
Reaction Pathways

scholarly journals Continuum models of focused electron beam induced processing

2015 ◽  
Vol 6 ◽  
pp. 1518-1540 ◽  
Author(s):  
Milos Toth ◽  
Charlene Lobo ◽  
Vinzenz Friedli ◽  
Aleksandra Szkudlarek ◽  
Ivo Utke
Keyword(s):  
Electron Beam ◽  
Substrate Surface ◽  
Input Parameter ◽  
Reaction Pathways ◽  
Continuum Models ◽  
Direct Write ◽  
Reaction Products ◽  
Wide Range ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes

Focused electron beam induced processing (FEBIP) is a suite of direct-write, high resolution techniques that enable fabrication and editing of nanostructured materials inside scanning electron microscopes and other focused electron beam (FEB) systems. Here we detail continuum techniques that are used to model FEBIP, and release software that can be used to simulate a wide range of processes reported in the FEBIP literature. These include: (i) etching and deposition performed using precursors that interact with a surface through physisorption and activated chemisorption, (ii) gas mixtures used to perform simultaneous focused electron beam induced etching and deposition (FEBIE and FEBID), and (iii) etch processes that proceed through multiple reaction pathways and generate a number of reaction products at the substrate surface. We also review and release software for Monte Carlo modeling of the precursor gas flux which is needed as an input parameter for continuum FEBIP models.

Molten Potassium Pyrosulfate: Reactions of Five Alkali-Metal Salts of Sulfur Oxo Acids

1986 ◽  
Vol 39 (11) ◽  
pp. 1889 ◽  
Author(s):  
PJ Mineely ◽  
SA Tariq
Keyword(s):  
Alkali Metal ◽  
Elemental Sulfur ◽  
Metal Salts ◽  
Reaction Pathways ◽  
Alkali Metal Salts ◽  
Reaction Products ◽  
Final Reaction

The reactions of five alkali-metal salts of sulfur oxo acids with molten K2S2O7 were investigated. Na2SO3, Na2S2O3, Na2S2O4, Na2S2O5 and K2S2O3 reacted with molten K2S2O7 to form sulfate, elemental sulfur and SO2 as the final reaction products. Reaction pathways have been postulated to explain the final products. The stoichiometries of the reactions have been determined.

scholarly journals Gasification Pathways and Reaction Mechanisms of Primary Alcohols in Supercritical Water

2019 ◽  
Author(s):  
Brian Pinkard ◽  
John Kramlich ◽  
Igor V. Novosselov
Keyword(s):  
Supercritical Water ◽  
Reaction Mechanisms ◽  
Radical Reaction ◽  
Water Environment ◽  
Waste To Energy ◽  
Reaction Pathways ◽  
Free Radical Reaction ◽  
Reaction Products ◽  
Primary Alcohols ◽  
Gaseous Products

<div> <p>Supercritical water gasification is a promising waste-to-energy technology with the ability to convert aqueous and/or heterogeneous organic feedstocks to high-value gaseous products, e.g., green hydrogen. Reaction behavior of complex molecules in supercritical water can be inferred through knowledge of the reaction pathways of model compounds in supercritical water. In this study methanol, ethanol, and isopropyl alcohol are gasified in a continuous supercritical water reactor at temperatures between 500 and 560 °C, and for residence times between 3 and 8 s. <i>In situ</i> Raman spectroscopy is used to rapidly identify and quantify reaction products. The experiments confirm the dominance of chain-branching, free radical reaction mechanisms that are responsible for decomposing primary alcohols in the supercritical water environment. Reaction pathways and mechanisms for three alcohols are proposed, conversion metrics are presented, and results are compared with known reaction mechanisms for methanol and ethanol oxidation.</p> </div> <br>

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