Gas and soot products formed in the pyrolysis of acetylene–ethanol blends under flow reactor conditions

Esarte, Claudia; Millera, Ángela; Bilbao, Rafael; Alzueta, María U.

doi:10.1016/j.fuproc.2009.01.011

Cited by 45 publications

(24 citation statements)

References 33 publications

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“…In this way, the odd-carbon-atom pathway of the cyclopentadienyl radical dimerization to form naphthalene [reaction (R2)], has been proposed in the 165 literature (e.g., Castaldi et al, 1996;Marinov et al, 1996): Figure 3 reports the total soot amount collected (in g) and the soot yield (in %), in all of the experiments. The soot yield is defined as the percentage of the carbon amount in soot related to the carbon amount fed into the reactor (Esarte et al, 2009). In Figure 3, it is observed that for any inlet 2,5-DMF concentration no soot formation occurs at 975 K. For 170 a fixed temperature, an increase in the inlet 2,5-DMF concentration leads to an increase both in the soot amount and in the soot yield, with a more significant influence of the inlet 2,5-DMF concentration at high temperatures, as it has been already reported earlier for other hydrocarbons and oxygenated compounds (Esarte et al 2009;Ruiz et al, 2007a;Sánchez et al, 2013).…”

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“…The soot yield is defined as the percentage of the carbon amount in soot related to the carbon amount fed into the reactor (Esarte et al, 2009). In Figure 3, it is observed that for any inlet 2,5-DMF concentration no soot formation occurs at 975 K. For 170 a fixed temperature, an increase in the inlet 2,5-DMF concentration leads to an increase both in the soot amount and in the soot yield, with a more significant influence of the inlet 2,5-DMF concentration at high temperatures, as it has been already reported earlier for other hydrocarbons and oxygenated compounds (Esarte et al 2009;Ruiz et al, 2007a;Sánchez et al, 2013). 175 For a fixed 2,5-DMF concentration, the expected trend is that the soot amount formed increases with the increase of the temperature.…”

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“…Figure 5 shows the gas yield (in %) as a function of temperature for the different inlet 2,5-DMF concentrations studied. The gas yield is defined as the percentage of the carbon amount in outlet gases related to the carbon amount fed into the reactor (Esarte et al, 2009). It is worth clarifying that the gas yield includes the 2,5-DMF amount found at the 225 reactor outlet.…”

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Influence of the Temperature and 2,5-Dimethylfuran Concentration on Its Sooting Tendency

Alexandrino

Salvo

Bilbao

et al. 2016

Combustion Science and Technology

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The sooting tendency of 2,5-dimethylfuran (2,5-DMF), as a proposed fuel or fuel additive, has been studied in a flow reactor at different reaction temperatures (975, 1075, 1175, 1275, 1375, and 1475 K) and 10 inlet 2,5-DMF concentrations (5000, 7500, and 15,000 ppm) under pyrolytic conditions. The quantification of soot and light gases has been done. Additionally, the experimental results of the light gases have been simulated with a detailed gas-phase chemical kinetic model. The experimental results indicate that the temperature has a 15 great influence on both the soot and gas yields, as well as on the concentration of the light gases of pyrolysis. The inlet 2,5-DMF concentration influences the soot yield, whereas no significant effect is observed on the gas yield.ARTICLE HISTORY

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Influence of the Temperature and 2,5-Dimethylfuran Concentration on Its Sooting Tendency

Alexandrino

Salvo

Bilbao

et al. 2016

Combustion Science and Technology

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“…This is attributed to the model, which does not include the main soot formation pathways. In fact, the growth of molecules implies the consumption of C 2 H 2 , leading to the overestimation of C 2 H 2 as stated by Esarte et al (17) .…”

Section: Journal Of Thermal Science and Technologymentioning

confidence: 92%

Experimental and Kinetic Studies of Chemical Role of CO2 in Hydrocarbon Oxidation during Fuel-Rich O2/CO2 Combustion

Watanabe

Kiatpanachart

Okazaki

2013

JTST

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Experimental and kinetic studies of the chemical role of CO 2 in hydrocarbon reactions were conducted in a fuel-rich CH 4 flat flame with air ratios varying from 0.60 to 0.74. Unburned hydrocarbons (CH 4 , C 2 H 2 , C 2 H 4 , and C 2 H 6 ) in O 2 /CO 2 combustion were found to be lower than those in air combustion. The differences in the CH 4 oxidation characteristics between the air and O 2 /CO 2 combustion were caused by the chemical role of CO 2 in the reaction R1 (CO 2 + H → CO + OH), R2 (CH 2 (S) + CO 2 → CH 2 O + CO), and higher third body efficiencies of CO 2 at an air ratio (= 0.62 where the concentrations of reactants were high. The role of CO 2 in R1, R2, and the higher third body efficiencies of CO 2 decreased the rate of CH 4 oxidation during the early stage of combustion, where O 2 was present. Even though R2 did not directly compete with the main chain branching reaction R3 (H + O 2 → H + OH) for H radicals, like R1 did, R2 changed the hydrocarbon reaction pathway, thereby decreasing the rate of R4 (CH 3 + HO 2 → CH 3 O + OH) which had negative sensitivity in CH 4 oxidation. However, we found that R1 and R2 advance CH 4 oxidation in the last stage of combustion where O 2 was mostly consumed. This is attributed to the fact that the reactions R1 and R2 were able to advance without the presence of O 2 , and that R1 produced OH radicals that were active in hydrocarbon oxidation in the specific temperature range and R2 enhanced hydrocarbon oxidation when the rate of R4 was insignificant. Although R1 was the dominant reaction to reduce unburned hydrocarbons in the O 2 /CO 2 combustion, the role of R2 was significant at  = 0.62. Meanwhile, when the air ratio was 0.74 where concentrations of reactants were relatively low, the chemical role of CO 2 is to only decrease the rate of CH 4 oxidation due to the presence of an excessive amount of O 2 .

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“…A number of the experimental studies reported have been carried out in practical systems such as in an engine or burner [1,2], and some have been carried out under well-controlled conditions, usually in a shock tube [3] or flow reactor [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Gas and Particulate Matter Products Formed in a Laminar Flow Reactor: Pyrolysis of Single-Component C2 Fuels

2015

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Investigations that rank the tendencies of single-component fuels to form soot have given useful insights into how molecules and local molecular structure influences the conversion of carbon in fuel to soot. These studies can provide fundamental understanding of how functional group chemistry influences the products formed during pyrolysis or combustion. A series of experiments have been conducted which investigate the conversion of oxygenated and hydrocarbon C 2 molecules (ethanol, ethane, and ethylene) to particulate matter (PM) and other species (CO, CO 2 ). Single-component fuels have been tested in a laminar flow reactor at concentrations of 8000 ppmv, under pyrolysis conditions. Size and mass distributions of particulates are reported, measured by means of a differential mobility spectrometer (Cambustion DMS500).

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Gas and soot products formed in the pyrolysis of acetylene–ethanol blends under flow reactor conditions

Cited by 45 publications

References 33 publications

Influence of the Temperature and 2,5-Dimethylfuran Concentration on Its Sooting Tendency

Influence of the Temperature and 2,5-Dimethylfuran Concentration on Its Sooting Tendency

Experimental and Kinetic Studies of Chemical Role of CO<sub>2</sub> in Hydrocarbon Oxidation during Fuel-Rich O<sub>2</sub>/CO<sub>2</sub> Combustion

Gas and Particulate Matter Products Formed in a Laminar Flow Reactor: Pyrolysis of Single-Component C2 Fuels

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