ESR Studies on the Formation of Sulfur Radicals in Irradiated Cysteine, Glutathione, and Djenkolic Acid

Abstract Two sulphur containing amino acids, dichrostachinic acid and djenkolic acid, and one sulphur containing imino acid, thiazolidine-4-carboxylic acid, have been isolated from the seeds o f Parkia speciosa Hassk. Dichrostachinic acid and djenkolic cyclic polysulphides in Parkia speciosa Hassk.

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Paramagnetic resonance of sulfur radicals in synthetic sodalites

The Journal of Physical Chemistry ◽

10.1021/j100701a035 ◽

1970 ◽

Vol 74 (6) ◽

pp. 1359-1363 ◽

Cited By ~ 44

Author(s):

Stuart D. McLaughlan ◽

David John Marshall

Keyword(s):

Paramagnetic Resonance ◽

Sulfur Radicals

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Solvent Effects on Thiol–Ene Kinetics and Reactivity of Carbon and Sulfur Radicals

The Journal of Physical Chemistry A ◽

10.1021/acs.jpca.9b10165 ◽

2020 ◽

Vol 124 (13) ◽

pp. 2580-2590 ◽

Cited By ~ 2

Author(s):

Ipek Munar ◽

Volkan Fındık ◽

Isa Degirmenci ◽

Viktorya Aviyente

Keyword(s):

Solvent Effects ◽

Sulfur Radicals

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Effects of Metal Ions on the γ-Radiolysis of Polycrystalline Djenkolic Acid

Radiation Research ◽

10.2307/3573928 ◽

1974 ◽

Vol 58 (2) ◽

pp. 154 ◽

Cited By ~ 1

Author(s):

Shiro Kominami ◽

Peter Riesz

Keyword(s):

Metal Ions ◽

Djenkolic Acid

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Direct Observation of Sulfur Radicals as Reaction Media in Lithium Sulfur Batteries

Journal of The Electrochemical Society ◽

10.1149/2.0851503jes ◽

2015 ◽

Vol 162 (3) ◽

pp. A474-A478 ◽

Cited By ~ 123

Author(s):

Qiang Wang ◽

Jianming Zheng ◽

Eric Walter ◽

Huilin Pan ◽

Dongping Lv ◽

...

Keyword(s):

Direct Observation ◽

Lithium Sulfur Batteries ◽

Reaction Media ◽

Sulfur Radicals ◽

Lithium Sulfur

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Xylene Addition Effects in Thermal Stage of Claus Reactors

Volume 1: Fuels and Combustion, Material Handling, Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines, Generators and Auxiliaries; Plant Operations and Maintenance; Reliability, Availability and Maintainability (RAM); Plant Systems, Structures, Components and Materials Issues ◽

10.1115/power2014-32056 ◽

2014 ◽

Author(s):

Salisu Ibrahim ◽

Ahmed S. AlShoaibi ◽

Ashwani K. Gupta

Keyword(s):

Mole Fraction ◽

Elemental Sulfur ◽

Formation Rate ◽

Direct Impact ◽

Reactor Performance ◽

Complete Combustion ◽

Baseline Case ◽

Claus Reactor ◽

Sulfur Radicals

Experimental results are presented on the effect of xylene addition to H2S/O2 flames at equivalence ratio of 3.0 (Claus Condition) with respect to H2S and complete combustion of xylene. The results from the combustion of H2S/xylene mixture is compared with the baseline case of 100% H2S combustion to isolate the role of xylene addition in the Claus reactor. Combustion of H2S alone showed a decrease in its mole until it reached to an asymptotic minimum mole fraction value. This resulted in the formation of SO2 to a maximum mole fraction which subsequently decomposed from the formation of elemental sulfur through its reaction with H2S. Addition of small amount of xylene (0.5% and 1%) increased the asymptotic minimum value of H2S as well as the formation of H2 which provided oxidation competition between the formed H2 and H2S. Presence of xylene also triggered the formation of CH4 and CO which provided pathway on the formation of COS and CS2. The oxidation of CH4 and CO by SO2 and other sulfur radicals reduced the maximum mole fraction of SO2 but increased the subsequent rate of SO2 decomposition to increase the formation rate of elemental sulfur. These results show the direct impact of trace amounts of xylene in the feed stream on sulfur formation to reveal direct impact on the Claus reactor performance for sulfur capture.

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