Effect of H2O and CO2 on propane, propene, and isopropanol oxidation at elevated pressures

Fedyaeva, O. N.; Artamonov, D. O.; Vostrikov, A. A.

doi:10.1016/j.combustflame.2018.09.031

Cited by 12 publications

(8 citation statements)

References 49 publications

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“…e obtained results show high efficiency in comparison with other works that used other catalysts that were used such as Al 2 O 3 , Cu 4 O 3 , and zeolite NaX [2,[27][28][29][30][31][32].…”

Section: Evolution Of the Conversion With Timementioning

confidence: 63%

Total Oxidation of Isopropanol in Its Liquid Phase, at a Low Temperature in the Presence of Prepared and Characterized Zinc Oxide

Dehmani

Amhoud

Abouarnadasse

2021

International Journal of Analytical Chemistry

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The complete oxidation of isopropanol in its liquid phase at a low temperature was studied in the presence of zinc oxide (ZnO). This solid was prepared with the precipitation method. Structural analysis (infrared in Fourier transform and diffraction of X-rays) and textured (adsorption/desorption of N2) were conducted for the wurtzite structure results, an IV type isotherm with a type H3 hysteresis. This solid presents a good catalytic activity against the complete oxidation of isopropanol, a constant of selectivity equal to 1; however, the studied temperatures were 40, 60, and 80°C. In addition, a kinetic study of the oxidation was performed and showed that the reaction follows a successive mechanism isopropanol-acetone-carbon dioxide. The low value of the apparent energy of the activation of this solid confirms the high value of the initial rate of the catalytic oxidation reaction of isopropanol in the temperature range studied.

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“…e obtained results show high efficiency in comparison with other works that used other catalysts that were used such as Al 2 O 3 , Cu 4 O 3 , and zeolite NaX [2,[27][28][29][30][31][32].…”

Section: Evolution Of the Conversion With Timementioning

confidence: 63%

Total Oxidation of Isopropanol in Its Liquid Phase, at a Low Temperature in the Presence of Prepared and Characterized Zinc Oxide

Dehmani

Amhoud

Abouarnadasse

2021

International Journal of Analytical Chemistry

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“…Depletion of light oil reserves and increased consumption of motor fuels lead to the involvement in the processing of heavy oil raw materials (heavy oil, bitumen, tar, and oil shale), characterized by a high content of thiophene derivatives. − The accumulation of waste from the production and processing of such raw materials causes environmental problems, in particular, pollution of nearby water areas. , Incineration of these wastes by conventional methods leads to the release of SO 2 and aerosol particles (primarily soot) into the atmosphere. , Since these wastes are usually waterlogged, the use of high-density water vapor or supercritical water (SCW: T > 647 K, P > 22.1 MPa) can become one of the ways of their environmentally safe processing. , The latter, in particular, is determined by the fact that the final product of oxidation of S-containing organic substances in an aqueous-oxygen mixture is sulfuric acid. , It is obvious that for the development of new technologies based on the combustion of fuels and wastes in dense water vapor or SCW, it is necessary to obtain data on the oxidation features of the individual compounds in these media. Oxidation of several hydrocarbons and heteroatomic compounds was studied earlier. − The present research is aimed at identifying the features of thiophene oxidation, as the simplest aromatic S-containing compound, in an aqueous medium.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents

2021

Self Cite

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The article presents the results of a study of thiophene oxidation in highdensity C 4 H 4 S/O 2 mixtures (ρ Thi = 0.12 and 0.15 mol/dm 3 , ρ O2 = 0.74−1.26 mol/dm 3 ), diluted with water vapor and argon (dilution level x D = 35−65% mol), at uniform heating (1 K/min) of a stainless-steel tubular reactor up to 823 K. It is established that the temperature of thiophene oxidation onset weakly depends on the nature of the diluent and the oxygen content in the reaction mixture. From the time dependences of the reaction mixtures on temperature and pressure, it follows that the oxidation of thiophene in the water vapor and argon media proceeds according to the mechanisms of homogeneous and heterogeneous reactions. Upon oxidation of thiophene in the stoichiometric mixtures in argon with a small amount of water vapor, as well as in the lean mixtures in water vapor, the contribution of reactions on the surface of the Pt−Rh/Pt thermocouple, inserted into the center of the reaction volume, is increased. Upon oxidation of thiophene in water vapor in the fuelenriched and stoichiometric mixtures, reactions on the oxidized surface of the reactor wall (primarily iron oxides) prevail. Increasing the density of water vapor both reduces the contribution of heterogeneous reactions on the reactor wall and prevents complete carbon burnout. It is shown that the neutralization of sulfuric acid, resulting from the oxidation of thiophene, with calcium carbonate reduces the corrosion of stainless steel. The X-ray diffraction analysis revealed the presence of ferrochromite, iron and chromium oxides, iron, nickel, and chromium sulfates in the corrosion products.

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“…Sabia et al 15 found CO 2 changes the combustion process of C 3 H 8 , because CO 2 participates in branching reactions and changes the oxidation rate of propane. Fedyaeva et al found the self-ignition temperature of C 3 H 8 /O 2 was decreased by the diluent medium CO 2 , 16 because CO 2 participates in branching reactions and changes the oxidation rate of propane. Law et al 17 major branching and termination reactions which changed the LFL of all combustible gas mixtures significantly.…”

Section: Introductionmentioning

confidence: 99%

Effect of Carbon Dioxide on the Lower Flammability Limit of Propane in O₂/CO₂ Atmosphere

Xie

et al. 2020

Energy Fuels

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This paper presents the results of the lower flammability limit (LFL) of C 3 H 8 /O 2 /CO 2 at normal temperature and pressure. The LFL of the C 3 H 8 /O 2 /CO 2 mixture was measured with an explosion vessel. The measured LFL of propane increased approximately linearly from 2.5% to 4.3% with the CO 2 concentration rising from 5% to 70%. CO 2 participates in element reactions, which decreases the combustion heat at LFL. The reduction of combustion heat is improved by the rising CO 2 concentration and reached a maximum of 21.5% at 70% CO 2 concentration. The effects of specific heat capacity and radiation property of the gas mixture on the LFL were analyzed. The effect of specific heat was improved by CO 2 , while the radiative effect was reduced.

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Effect of H2O and CO2 on propane, propene, and isopropanol oxidation at elevated pressures

Cited by 12 publications

References 49 publications

Total Oxidation of Isopropanol in Its Liquid Phase, at a Low Temperature in the Presence of Prepared and Characterized Zinc Oxide

Total Oxidation of Isopropanol in Its Liquid Phase, at a Low Temperature in the Presence of Prepared and Characterized Zinc Oxide

Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents

Effect of Carbon Dioxide on the Lower Flammability Limit of Propane in O₂/CO₂ Atmosphere

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Effect of H2O and CO2 on propane, propene, and isopropanol oxidation at elevated pressures

Cited by 12 publications

References 49 publications

Total Oxidation of Isopropanol in Its Liquid Phase, at a Low Temperature in the Presence of Prepared and Characterized Zinc Oxide

Total Oxidation of Isopropanol in Its Liquid Phase, at a Low Temperature in the Presence of Prepared and Characterized Zinc Oxide

Effect of the Fuel Equivalence Ratio on the Mechanisms of Thiophene Oxidation in Water Vapor at Increased Density of the Reagents

Effect of Carbon Dioxide on the Lower Flammability Limit of Propane in O2/CO2 Atmosphere

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Effect of Carbon Dioxide on the Lower Flammability Limit of Propane in O₂/CO₂ Atmosphere