Differentiation of O–H and C–H Bond Scission Mechanisms of Ethylene Glycol on Pt and Ni/Pt Using Theory and Isotopic Labeling Experiments

2011 ◽  
Vol 133 (20) ◽  
pp. 7996-8004 ◽  
Author(s):  
Michael Salciccioli ◽  
Weiting Yu ◽  
Mark A. Barteau ◽  
Jingguang G. Chen ◽  
Dionisios G. Vlachos
Keyword(s):  
Ethylene Glycol ◽  
Isotopic Labeling ◽  
Bond Scission

PRIMARY METHOXY RADICAL FORMATION IN THE REACTION OF METHANOL VAPOR WITH Hg 6(3P1) ATOMS

1961 ◽  
Vol 39 (6) ◽  
pp. 1231-1238 ◽  
Author(s):  
Arthur R. Knight ◽  
Harry E. Gunning
Keyword(s):  
Quantum Yield ◽  
Ethylene Glycol ◽  
Spectrometric Analysis ◽  
Methanol Vapor ◽  
Methyl Nitrite ◽  
Bond Scission ◽  
Hydroxymethyl Radicals ◽  
Primary Origin ◽  
Pure Methanol ◽  
Static Conditions

A study has been made of the decomposition of methanol vapor by Hg 6(3P1) atoms, under static conditions, at 25 °C. A system constructed entirely of quartz was employed to eliminate the dark reaction between methanol vapor and pyrex glass to form trimethyl borate. Emphasis in this investigation was placed on the determination of the nature of the primary processes operative, and to this end, the reaction was studied in some detail in the presence of nitric oxide.For pure methanol, the major primary products were found to be hydrogen and ethylene glycol. The primary quantum yield for hydrogen was 0.46. Minor products of primary origin were formaldehyde (0.01), ethane (0.005), and dimethyl ether (0.006), with the numbers in parentheses showing the primary quantum yields.In the presence of nitric oxide, the major products became methyl nitrite, nitrous oxide, and water. The quantum yield of methyl nitrite rose steadily with increasing NO concentrations. For a 1:1 CH3OH:NO mixture, the primary quantum yield for methyl nitrite was found to be 0.56. The behavior of the reaction in the presence of NO establishes fairly unequivocally that the major primary process involves O—H bond scission to form methoxy radicals and H atoms. These primary radicals then form hydroxymethyl radicals by abstraction reactions with the substrate. The ethylene glycol product arises by recombination of the secondary hydroxymethyl radicals. These conclusions were further substantiated by mass spectrometric analysis of the products of the decomposition of CD3OH. It was shown that CD3OD is a significant product of the reaction.

Theoretical and Experimental Studies of C–C versus C–O Bond Scission of Ethylene Glycol Reaction Pathways via Metal-Modified Molybdenum Carbides

ACS Catalysis ◽  
2014 ◽  
Vol 4 (5) ◽  
pp. 1409-1418 ◽  
Author(s):  
Weiting Yu ◽  
Michael Salciccioli ◽  
Ke Xiong ◽  
Mark A. Barteau ◽  
Dionisios G. Vlachos ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Experimental Studies ◽  
Reaction Pathways ◽  
Molybdenum Carbides ◽  
Bond Scission

PIEZOELECTRIC PROPERTIES OF POLY(3-HYDROXYBUTYRATE-CO-3-HEDROXYBUTYRATE)-CO-POLY(ETHYLENE GLYCOL) PRODUCED BY CONTROLLED MICROBIOLOGICAL BIOSYNTHESIS

2019 ◽  
Vol 10 (10) ◽  
Author(s):  
Anton Bonartsev ◽  
Vera Voinova ◽  
Elizaveta Akoulina ◽  
Andrey Dudun ◽  
Irina Zharkova ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Piezoelectric Properties ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Hydrogenolysis of glucose and fructose in glycol solutions over CuO-MgO-ZrO2 catalyst

2020 ◽  
pp. 48-55
Author(s):  
M.E. Sharanda ◽  
◽  
E.A. Bondarenko ◽  
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Flow Reactor ◽  
General Trend ◽  
Raw Materials ◽  
Reaction Products ◽  
Renewable Raw Materials ◽  
High Partial Pressure ◽  
Zro2 Catalyst ◽  
Phase Process

Ethylene glycol and propylene glycol are important representatives of polyols. On an industrial scale, they are obtained from petrochemical raw materials. Within a decade, significant efforts were made for the producing of polyols from biologically renewable raw materials - carbohydrates. The general trend for carbohydrate hydrogenolysis includes application of liquid-phase process with the use of modified metal-oxide catalysts, at 120-120 ° C and pressure of 3MPa or above. So high pressure is used for the reason to increase hydrogen solubility, and also due to the high partial pressure of low boiling solvents. We supposed that usage of high boiling solvents could allow hydrogenolysis to be performed at the lower pressure. Ethylene glycol and propylene glycol are of particular interest as such kind of solvent since they are both the main products of glucose hydrogenolysis. In this work, the process of hydrogenolysis of glucose and fructose over Cu / MgO-ZrO2 catalyst have been studied at temperature range of 160-200 °C and a pressure of 0.1-0.3 MPa in a flow reactor. The solvents were simultaneously the target products of the reaction - ethylene glycol and / or propylene glycol. Gas chromatography and 13C NMR were used for the reaction products identification. It was found that the solubility of glucose in propylene glycol is 21 % by weight, and in ethylene glycol 62% by weight. It was pointed out that the process of hydrogenolysis can take place at a pressure close to atmospheric. Under these conditions, the conversion of hexoses reaches 96-100 %. The reaction products are preferably propylene glycol and ethylene glycol. The total selectivity for C3-2 polyols is 90-94 %, that is higher than in the hydrogenolysis of glucose in aqueous solution.

JET IMPINGEMENT-COOLED MODULE FOR AUTOMOTIVE POWER ELECTRONICS USING WATER-ETHYLENE GLYCOL

2017 ◽  
Author(s):  
Michael A. Henry ◽  
John F. Maddox ◽  
Sushil Bhavnani ◽  
Roy W. Knight ◽  
James Pool
Keyword(s):  
Ethylene Glycol ◽  
Power Electronics ◽  
Jet Impingement

A model for thermal conductivity of carbon nanotubes with ethylene glycol/water based nanofluids

2017 ◽  
Vol 59 (02) ◽  
pp. 10-13
Author(s):  
Trong Tam Nguyen ◽  
◽  
Hung Thang Bui ◽  
Ngoc Minh Phan ◽  
◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Ethylene Glycol ◽  
Water Based
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