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Guo L.,Northwest University, China | Xiang X.,Northwest University, China | Wu X.,Northwest University, China | Ma X.,Northwest University, China | Xia Y.,HyChar Energy LLC
Huagong Xuebao/CIESC Journal | Year: 2012

Reducing process of carbon dioxide with electronegative ions of iodine, by DC-negative high voltage corona discharge, was investigated. The effects of gas flow, discharge frequencies and molar ratios of the iodine vapor to carbon dioxide on conversions of carbon dioxide were also examined. The results show that tetraiodomethane was synthesized successfully by electronegative ions of iodine at 70°C and its yield decreases with increasing flow rates of CO 2. When the gas flow rate was 0.06 L · min -1, the discharge frequency 9.608 kHz and molar ratio of I 2/CO 2 2.5, the conversion of CO 2 with electronegative ions of iodine reached 88.71%. Reducing reaction mechanism of electronegative ions of iodine and CO 2 is also discussed. Source


Xiang X.,Northwest University, China | Wu X.,Northwest University, China | Guo L.,Northwest University, China | Ma X.,Northwest University, China | Xia Y.,HyChar Energy LLC
Plasma Sources Science and Technology | Year: 2012

The behavior of the wake of an electronegative gas flow past either a glass or a magnetic circular cylinder was observed using the smoke wire flow visualization technique. Converging or chaotic vortices for the electronegative flow of air and oxygen past a magnetic cylinder were seen in shedding vortices, especially at higher concentrations of electronegative molecules, eventually leading to the disappearance of a Kármán vortex, possibly due to the effect of 'interactive solenoids'. © 2012 IOP Publishing Ltd. Source


Xiang X.,Northwest University, China | Guo L.,Northwest University, China | Wu X.,Northwest University, China | Ma X.,Northwest University, China | Xia Y.,HyChar Energy LLC
Environmental Chemistry Letters | Year: 2012

Urea synthesis, currently the largest use of carbon dioxide in organic synthesis, is conventionally operated at high pressure and high temperature. Here, we report for the first time that urea forms at atmosphere and ambient temperatures by negative corona discharge in gas phase. The conversion of CO 2 and yields of a solid mixture of urea and ammonium carbamate, which was identified by the 13C NMR spectrum, rise with reducing temperatures and increasing molar ratios of NH 3/CO 2 and discharge frequencies. The conversion of carbon dioxide was found to be 82.16 % at 20 °C and 1 atm with a molar flow ratio of n(NH 3)/n(CO 2) of 2.5. High pressure and high temperature as energy inputs are not necessary. © 2012 Springer-Verlag. Source


Xiang X.,Northwest University, China | Guo L.,Northwest University, China | Wu X.,Northwest University, China | Ma X.,Northwest University, China | Xia Y.,HyChar Energy LLC
Environmental Chemistry Letters | Year: 2012

We here report that by using electronegative gas of iodine and CO 2 under negative corona discharge, tetraiodomethane could be synthesized at 70 °C and 1 atm without any catalyst, despite thermodynamically infeasible at ambience without electron discharge. The conversion of carbon dioxide reached 88. 71 % at a gas flow rate of 0. 06 L/min and a discharge frequency of 9. 608 kHz. The anion-involved CO 2 reduction process could be implemented efficiently under mild conditions, avoiding high temperature and high pressure. © 2012 Springer-Verlag. Source


Guo L.,Northwest University, China | Ma X.,Northwest University, China | Xia Y.,HyChar Energy LLC | Xiang X.,Northwest University, China | Wu X.,Northwest University, China
Fuel | Year: 2015

Abstract Direct production of useful fuel from the emitted carbon dioxide has been one of major challenges in industries. We here report a novel approach in which ethanol could simply be synthesized under negative DC corona discharge at 1 atm and 105 °C. The experimental results have shown that CO2 and H2O could be reduced mainly into ethanol with yield of 4.7% without applying any metal catalyst. And with increase of total feeding pressure of gases, the yield appears to rise. The mechanism of electron attachment on those gaseous molecules creating accelerated anions might be the key of CO2 and H2O reduction reaction. This finding also implies that it might be feasible to use of negative corona discharge and CO2 as only carbon source with steam as only source of hydrogen to produce energy-dense ethanol fuel, also possibly leading to electric energy storage. © 2015 Elsevier Ltd. Source

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