Kinetics of the Oxidation of Carbon Monoxide and the Decomposition of Carbon Dioxide in a Radiofrequency Electric Discharge. I. Experimental Results

Brown, L. C.; Bell, Alexis T.

doi:10.1021/i160051a008

Cited by 46 publications

(34 citation statements)

References 8 publications

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“…In this connection it should be noted that, in the steady-state of electrical discharge of CO 2 -CO-O 2 mixtures, a significant amount of CO equilibrates with CO 2 even if plenty of oxygen exists. 14) Therefore, in order to oxidize the polymer completely to carbon dioxide, CO 2 formed in additional discharge was trapped continuously by a liquid nitrogen cooled U-tube equipped close to the discharge area. In the preliminary test, it has been found that 30 min discharge is enough to oxidize the polymer to CO 2 .…”

Section: Methodsmentioning

confidence: 99%

“…The production of 14 C in the nuclear reactor and its subsequent release into the surrounding environment contributes a significant fraction of the radiation dose to humans from the nuclear power industry. To avoid 14 C being discharged from nuclear facilities, an effective fixation technique needs to be developed.…”

Section: Introductionmentioning

confidence: 99%

“…To avoid 14 C being discharged from nuclear facilities, an effective fixation technique needs to be developed. 1) In addition, to reduce the total amount of radioactive waste, the fixation process should contain the 14 C enrichment process.…”

Section: Introductionmentioning

confidence: 99%

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Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Mori

Akatsuka

Suzuki

2001

Journal of Nuclear Science and Technology

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The separation of carbon and oxygen isotopes in CO glow discharge has been studied. The isotope enrichment in the products was measured by quadru-pole mass spectrometer. The reaction yield and empirical formula of solid phase products were determined by the gas-volumetric analysis. The stable products obtained in our experiment are CO 2 and solid polymers formed on the discharge wall. The polymer consists of both carbon and oxygen and the oxygen/carbon mole ratio in the polymer is 0.35±0.05. The isotope enrichment coefficients show a strong negative dependence on discharge current though the relative reaction yields have an opposite tendency. Consequently, the maximum isotope enrichment coefficients for 13 C in wall deposit of 2.31 and for 18 O in CO 2 of 1.37 are obtained when the discharge current and the reaction yields are minimum in our experimental range. The experimental results of isotope enrichment have been compared with theoretical values estimated by an analytical model of literature. The dilution mechanism of the isotope enrichment of stable products is inferred from the isotopic distributions of 13 C and 18 O in products and theoretical predictions for isotope enrichment.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Mori

Akatsuka

Suzuki

2001

Journal of Nuclear Science and Technology

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“…The net power to the discharge was determined by obtaining an optimum match and by reading the difference between the forward and reflected power. 16 The reactants and final mixtures were analyzed by an on-line Fourier transform infrared (FTIR) spectrometer (Bio-Rad, Model FTS-7), which was connected for quantifying CH 4 , SO 2 , CS 2 , COS, C 2 H 2 , C 2 H 4 , CO and CO 2 , and a gas chromatograph (GC, HP 5890) equipped with a thermal conductivity detector for identifying CO, CO 2 2 ] ratios (R) assigned as 0-3, the applied RF powers (E) were in the range of 15-120 W at a fixed total flow rate of 100 standard cm 3 min −1 and at room temperature (∼25 • C). The system pressures (P) were operated at 1333-8000 N m −2 in order to generate discharge with lower effluent gas temperatures, which were measured by a thermocouple that was set at the rear of the discharge zone.…”

Section: Experimental Apparatus and Chemical Analysismentioning

confidence: 99%

Production of syngas for the reduction of sulfur dioxide by methane via a direct RF plasmalysis process

Tsai

Wang

Huang

et al. 2003

J of Chemical Tech & Biotech

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The traditional process for the reduction of SO 2 by CH 4 usually leads to enrichment of the effluents with H 2 S and CO 2 . In this study, a radio-frequency (RF) plasma system was applied to generate useful byproduct: syngas (H 2 and CO) at room temperature. Experimental results indicate that the H 2 /CO ratio increased with the elevation of inlet [CH 4 ]/[SO 2 ] ratio (R), or the decrease of applied power (E) or operational pressure (P). H 2 /CO values ranged from 1.34 to 4.28 and reached 2.09 and 1.95 for E = 90 W and 120 W, respectively, at R = 1 and P = 4000 N m −2 . At first the selectivity to CO increased with the elevation of R or E, while the selectivity to H 2 was only decreased at R > 2 whatever the power that was supplied. However, at R = 2, optimum selectivities of H 2 and CO, and decomposition efficiencies of CH 4 and SO 2 , were achieved. The decomposition efficiencies and product components strongly depend on E or R. CH 4 is more easily decomposed than SO 2 and yields mainly syngas, with traces of CO 2 , C 2 H 2 , and C 2 H 4 . In addition, sulfur-containing compounds including major amounts of CS 2 , elemental sulfur and minor amounts of COS, but no toxic H 2 S, were observed. The formation pathways of syngas are also proposed to provide useful information to gain insight into the CH 4 conversion in the RF plasma.

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“…Butylkin et al (1979) applied numerical techniques to solution of quenching and kinetics problems in high-temperature C02 decomposition process and to determine energy consumptions for oxygen production at different quenching rates. Carbon dioxide decomposition has been studied both in nonequilibrium (Brown and Bell, 1974;Legasov et al, 1977) and equilibrium plasmas.…”

Section: Canadamentioning

confidence: 99%

Plasma decomposition of carbon dioxide

Huczko

1984

AIChE Journal

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h hi& hm 4 L N P P p1 Q Qm t T U 2, V Y X = layer thickness, m = values of h for Q < Qm, m = maximum value of h, m = discrete values of h, m = length scale in y-direction, m = number of discrete points, dimensionless = fluid pressure, N-m-2 = jet pressure, N.m-2 = scaled maximum pressure gradient, dimensionless = volume flux per unit span, m2.s-1 = maximum value of Q, m2.s-1 = time, s = tangential stress in jet, N.m-2 = horizontal fluid velocity, m-s-1 = vertical fluid velocity, m-s-1 = upward speed of sheet, ms-1 = horizontal coordinate, m = vertical coordinates, m Greek Letters E P = fluid viscosity, N-m-2-s-1 V = PIP P = fluid density, kg-m-3 U = surface tension coefficient, N-m-' r 1 = normal stress, N.m-2 7 1 1 = tangential stress, N-m-2 7 = u~~/~V 1/2p-3/2g-3/2L-3, dimensionless = measure of surface slope h/L, dimensionless LITERATURE CITED Atherton, R. W., and G. M. Homsy, "On the Derivation of Evolution Equations For Interfacial Waves," Chem. Eng. Comm., 2,57 (1976). Cameron, A., Principles of Lubrication, Longmans, London (1966). Deryaguin, B. V., "On The Thickness of the Liquid Film Adhering to the Walls of a Vessel after Emptying," Acta Pkyssiochtmicu U.R.S.S., 20, 349 (1945). 2 000 3000 4 000 5000 T e m p e r a t u r e , K Figure 2. Equilibrium composition of the C-0 system. C O = 19.

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Kinetics of the Oxidation of Carbon Monoxide and the Decomposition of Carbon Dioxide in a Radiofrequency Electric Discharge. I. Experimental Results

Cited by 46 publications

References 8 publications

Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Carbon and Oxygen Isotope Separation by Plasma Chemical Reactions in Carbon Monoxide Glow Discharge

Production of syngas for the reduction of sulfur dioxide by methane via a direct RF plasmalysis process

Plasma decomposition of carbon dioxide

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