Sulfur radicals embedded in various cages of ultramarine analogs prepared from zeolites

2007 ◽  
Vol 180 (3) ◽  
pp. 1119-1124 ◽  
Author(s):  
Stanisław Kowalak ◽  
Aldona Jankowska ◽  
Sebastian Zeidler ◽  
Andrzej B. Wie¸ckowski
Keyword(s):  
Sulfur Radicals

Paramagnetic resonance of sulfur radicals in synthetic sodalites

1970 ◽  
Vol 74 (6) ◽  
pp. 1359-1363 ◽  
Author(s):  
Stuart D. McLaughlan ◽  
David John Marshall
Keyword(s):  
Paramagnetic Resonance ◽  
Sulfur Radicals

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

2020 ◽  
Vol 124 (13) ◽  
pp. 2580-2590 ◽  
Author(s):  
Ipek Munar ◽  
Volkan Fındık ◽  
Isa Degirmenci ◽  
Viktorya Aviyente
Keyword(s):  
Solvent Effects ◽  
Sulfur Radicals

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

2015 ◽  
Vol 162 (3) ◽  
pp. A474-A478 ◽  
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

Xylene Addition Effects in Thermal Stage of Claus Reactors

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.

Addition of sulfur radicals to fullerenes

2010 ◽  
Vol 111 (15) ◽  
pp. 4266-4275 ◽  
Author(s):  
Pablo A. Denis ◽  
Federico Iribarne
Keyword(s):  
Sulfur Radicals

Understanding the Chemistry of the Rubber/Silane Reaction for Silica Reinforcement, Using Model Olefins

2003 ◽  
Vol 76 (5) ◽  
pp. 1311-1328 ◽  
Author(s):  
S. C. Debnath ◽  
R. N. Datta ◽  
J. W. M. Noordermeer
Keyword(s):  
High Performance ◽  
Model Compound ◽  
Mechanistic Model ◽  
Coupling Agents ◽  
Clear Understanding ◽  
Reverse Phase ◽  
High Level ◽  
Sulfur Radicals ◽  
Optimum Balance ◽  
Sulfur Donor

Abstract Although bifunctional organosilanes, particularly bis-(triethoxy-silyl-propyl) tetrasulfide (TESPT), are very efficient silica-rubber coupling agents, a high level is required to realize an optimum balance of processing as well as other performance characteristics. As to the functionality of TESPT in silica stocks, till today there remain numerous speculations rather than a clear understanding. An investigation has been carried out to understand the mechanism of the coupling of TESPT with rubber using a model olefin 2,3-dimethyl-2-butene (TME). Reverse Phase High Performance Liquid Chromatography in combination with Mass Spectroscopy shows that when pure TESPT is heated at 140 °C, the concentration of higher S-ranks in TESPT decreases, but in the presence of S8 the concentration of higher S-ranks increases. Treating TME with TESPT at 140 °C yields a mixture of crosslink products differing in the length of the sulfur-link. A mechanistic model for the reaction of TESPT with rubber is proposed, where TESPT donates activated sulfur-radicals, which can react with the rubber or model compound without the need for additional accelerators or vulcanizing agents. As ZnO plays no role in this mechanism, the TESPT merely acts as a sulfur-donor, not in the sense of an accelerator.

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