Decaying of Nitrogen Second Positive System by Addition of H&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; Gas in Air DB Discharge

El-Zeer, Doaa M.; Samir, Ahmed; Elakshar, F. F.; Garamoon, A. A.

doi:10.4236/jmp.2013.42022

Cited by 12 publications

(8 citation statements)

References 14 publications

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“…At 90%He and 10%H 2 , all peaks of He species were clearly detected at 336, 356, 388, 501, 587, 667, 706 and 727.5 nm while only one peak of H 2 species appeared which was H α at 656.3 nm representing hydrogen atom excitation. This was related to the characteristic of cold plasma presented in the study of El-Zeer et al 49 and mentioned in Yepez et al 46 ’s work that cold plasma consisted mostly of hydrogen radicals responding in the reaction. For the case of 20%He and 80%H 2 , the plasma color was visually observed to became brighter/lighter, having a more whitish tone as shown in supplementary materials Fig.…”

Section: Resultsmentioning

confidence: 75%

Low-temperature and atmospheric pressure plasma for palm biodiesel hydrogenation

Kongprawes

Wongsawaeng

Ngaosuwan

et al. 2021

Sci Rep

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Partially hydrogenated fatty acid methyl ester (H-FAME) is conventionally produced through partial hydrogenation under high pressure and elevated temperature in the presence of a catalyst. Herein, a novel green, catalyst-free, non-thermal and atmospheric pressure dielectric barrier discharge (DBD) plasma was employed instead of a conventional method to hydrogenate palm FAME. H-FAME became more saturated with the conversion of C18:2 and C18:3 of 47.4 and 100%, respectively, at 100 W input power, 1 mm gas-filled gap size and 80% H2 in the mixed gas at room temperature for 5 h, causing a reduction of the iodine value from 50.2 to 43.5. Oxidation stability increased from 12.8 to 20 h while a cloud point changed from 13.5 to 16 °C. Interestingly, DBD plasma hydrogenation resulted in no trans-fatty acid formation which provided a positive effect on the cloud point. This green DBD plasma system showed a superior performance to a conventional catalytic reaction. It is an alternative method that is safe from explosion due to the mild operating condition, as well as being highly environmentally friendly by reducing waste and energy utilization from the regeneration process required for a catalytic process. This novel green plasma hydrogenation technique could also be applied to other liquid-based processes.

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Section: Resultsmentioning

confidence: 75%

Low-temperature and atmospheric pressure plasma for palm biodiesel hydrogenation

Kongprawes

Wongsawaeng

Ngaosuwan

et al. 2021

Sci Rep

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“…An increase in saturated and a decrease in unsaturated fatty acids were observed in all treated samples. Solid fractions had higher exposure to reactive plasma species (especially H radicals and H + ) (El‐Zeer et al, 2013) and showed more considerable changes in their composition. A significant increase in stearic acid (18:0) was observed in solid fractions from 4.5% to 10.4%.…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that HVACP can degrade the H 2 molecules forming H + , H 3 + , and H ● species by 0.0001%, 0.1%, and 1%, respectively (El‐Zeer et al, 2013). As the H ● radicals are more abundant in the process, it can be suggested that H ● radicals are the most active species and can be responsible for any possible reaction.…”

Section: Resultsmentioning

confidence: 99%

Cold Plasma Treatment of Soybean Oil with Hydrogen Gas

Yepez

Baykara

et al. 2020

J Americ Oil Chem Soc

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High‐voltage atmospheric cold plasma (HVACP) treatment generates reactive gas species that induce inter‐ and intramolecular reactions in soybean oil. The goal of this study is to analyze the effect of HVACP treatment on the chemical structure of soybean oil in a hydrogen gas environment at atmospheric pressure. HVACP was used to treat soybean oil (15 g) for up to 6 hours by triplicate. Plasma‐generated reactive gas species interact with the sample, producing three distinct fractions identified as a liquid, gel, and solid. Fatty acid profile, Fourier‐transform infrared spectroscopy, proton and carbon nuclear magnetic resonance, size‐exclusion chromatography, thermal properties, and peroxide value were used to characterize the chemical structure. Results indicated a lower content of polyunsaturated fatty acids, increased content of saturated fatty acids, and the presence of isomers. An insoluble portion was observed in the solid fraction and increased with treatment time up to 42% in the 6‐h treated samples. Plasma species may cause two main reactions: polymerization and hydrogenation.

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“…It has been reported that HVACP can degrade the H 2 molecules forming H + , H 3 + , and H * species by 0.0001%, 0.1%, and 1 %, respectively (El-Zeer et al, 2013). Since the H * radicals are more abundant in the process, it can be suggested that H * radicals are the most active species and can be responsible for any possible reaction.…”

Section: Fig 2 -About Herementioning

confidence: 99%

Atmospheric Cold Plasma Treatment of Soybean Oil with Hydrogen Gas

Yepez

Baykara

et al. 2020

Preprint

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High voltage atmospheric cold plasma (HVACP) treatment generates reactive gas species that induce inter and intramolecular reactions in soybean oil. The goal of this study is to analyze the effect of HVACP treatment on the chemical structure of soybean oil in a hydrogen gas environment at atmospheric pressure. HVACP was used to treat soybean oil (15g), for up to 6h by triplicate. Plasma generated reactive gas species interact with the sample producing three distinct fractions identified as a liquid, gel, and solid. Fatty acid profile, FTIR, 1H-NMR/13C-NMR, GPC, thermal properties and peroxide value, were used to characterize the chemical structure. Results indicated a lower content of polyunsaturated fatty acids, increased content of saturated fatty acids, and the presence of isomers. An insoluble portion was observed in the solid fraction and increase with treatment time up to 42% in the 6h treated samples. Plasma species may cause two main reactions: polymerization and hydrogenation.

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Decaying of Nitrogen Second Positive System by Addition of H<sub>2</sub> Gas in Air DB Discharge

Cited by 12 publications

References 14 publications

Low-temperature and atmospheric pressure plasma for palm biodiesel hydrogenation

Low-temperature and atmospheric pressure plasma for palm biodiesel hydrogenation

Cold Plasma Treatment of Soybean Oil with Hydrogen Gas

Atmospheric Cold Plasma Treatment of Soybean Oil with Hydrogen Gas

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