Pyrolysis of ethane in the presence of hydrogen sulfide. Rates of formation of ethylene, hydrogen, and methane

1970 ◽  
Vol 48 (11) ◽  
pp. 1782-1785 ◽  
Author(s):  
P. R. McLean ◽  
D. J. McKenney
Keyword(s):  
Thermal Decomposition ◽  
Hydrogen Sulfide ◽  
Quantitative Data ◽  
Methane Formation ◽  
Partial Product ◽  
Complex Mechanism ◽  
Product Analysis ◽  
Hydrogen Formation

Rates of formation of ethylene, hydrogen, and methane have been measured at 630 °C for the thermal decomposition of ethane at pressures between 100 and 620 Torr, with various pressures (approximately 1 to 100 Torr) of added hydrogen sulfide. The effect of the H2S was to increase the rate of methane formation and to decrease the rate of ethylene and hydrogen formation. Rates of formation of all three of these gases decreased with increasing hydrogen sulfide pressures. The quantitative data obtained and the partial product analysis indicate that a complex mechanism is operative. Possible qualitative explanations for the observations are discussed.

scholarly journals Thermal decomposition of tris(O-ethyldithiocarbonato)-antimony(III)—a single-source precursor for antimony sulfide thin films

2021 ◽  
Author(s):  
Jako S. Eensalu ◽  
Kaia Tõnsuaadu ◽  
Jasper Adamson ◽  
Ilona Oja Acik ◽  
Malle Krunks
Keyword(s):  
Thin Films ◽  
Thermal Decomposition ◽  
Mass Loss ◽  
Solid Phase ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
Thermal Decomposition Mechanism ◽  
Product Analysis ◽  
Gaseous Species ◽  
Single Source Precursor

AbstractThermal decomposition of tris(O-ethyldithiocarbonato)-antimony(III) (1), a precursor for Sb2S3 thin films synthesized from an acidified aqueous solution of SbCl3 and KS2COCH2CH3, was monitored by simultaneous thermogravimetry, differential thermal analysis and evolved gas analysis via mass spectroscopy (TG/DTA-EGA-MS) measurements in dynamic Ar, and synthetic air atmospheres. 1 was identified by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) measurements, and quantified by NMR and elemental analysis. Solid intermediates and final decomposition products of 1 prepared in both atmospheres were determined by X-ray diffraction (XRD), Raman spectroscopy, and FTIR. 1 is a complex compound, where Sb is coordinated by three ethyldithiocarbonate ligands via the S atoms. The thermal degradation of 1 in Ar consists of three mass loss steps, and four mass loss steps in synthetic air. The total mass losses are 100% at 800 °C in Ar, and 66.8% at 600 °C in synthetic air, where the final product is Sb2O4. 1 melts at 85 °C, and decomposes at 90–170 °C into mainly Sb2S3, as confirmed by Raman, and an impurity phase consisting mostly of CSO 2 2− ligands. The solid-phase mineralizes fully at ≈240 °C, which permits Sb2S3 to crystallize at around 250 °C in both atmospheres. The gaseous species evolved include CS2, C2H5OH, CO, CO2, COS, H2O, SO2, and minor quantities of C2H5SH, (C2H5)2S, (C2H5)2O, and (S2COCH2CH3)2. The thermal decomposition mechanism of 1 is described with chemical reactions based on EGA-MS and solid intermediate decomposition product analysis.

scholarly journals Revisit of the Photoirradiation of α-Lipoic Acid—Role of Hydrogen Sulfide Produced in the Reaction

BioChem ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 148-158
Author(s):  
Naoki Wada ◽  
Seiichi Matsugo
Keyword(s):  
Hydrogen Sulfide ◽  
Lipoic Acid ◽  
Photochemical Reaction ◽  
Dimethyl Disulfide ◽  
Polymeric Materials ◽  
Reduced Form ◽  
Product Analysis ◽  
Plausible Mechanism ◽  
Ph Dependent

α-Lipoic acid (LA) has the specific absorption band at 330 nm and is quite vulnerable to UV irradiation, affording a variety of compounds including polymeric materials and hydrogen sulfide. A better understanding of the photochemical reaction of LA has already been carried out focusing mainly on the reaction product analysis derived from LA. We re-investigated the photochemical reaction of LA focusing our attention on the fate of hydrogen sulfide (H2S) produced in the photochemical reaction procedure. The photoirradiation of LA in the presence of oxidized glutathione (GSSG) formed glutathione trisulfide (GSSSG) and a reduced form of glutathione (GSH). Similar results were obtained in the co-presence of cystine and dimethyl disulfide. The concentration of H2S was reaching the maximum concentration, which was gradually decreasing within 10 min after photoirradiation, while the concentration of GSSSG was increasing with the decrease of H2S concentration. The structural confirmation of GSSSG and the plausible mechanism for the formation of GSSSG are proposed based on the time-dependent and pH-dependent profile of the photoirradiation.

Pertechnetate immobilization in aqueous media with hydrogen sulfide under anaerobic and aerobic environments

2007 ◽  
Vol 95 (12) ◽  
Author(s):  
Yongjian Liu ◽  
Jeff Terry ◽  
Silvia S. Jurisson
Keyword(s):  
Hydrogen Sulfide ◽  
Alkaline Solution ◽  
Aqueous Media ◽  
Anaerobic Conditions ◽  
Product Analysis ◽  
Acidic Solutions ◽  
First Order

SummaryThe basic chemistry for the immobilization of pertechnetate (TcOPertechnetate immobilization was found to be first order with respect to both sulfide and pertechnetate in acidic solutions, and in alkaline solution under anaerobic conditions. The results of stoichiometry studies and product analysis under alkaline anaerobic environments indicated that Tc

The decomposition of Bicyclo[3,3,1]nonan-9-ylidene

1970 ◽  
Vol 23 (8) ◽  
pp. 1625 ◽  
Author(s):  
RD Allan ◽  
RJ Wells
Keyword(s):  
Thermal Decomposition ◽  
Sodium Salt ◽  
Aprotic Solvents ◽  
Protic Solvent ◽  
Product Analysis ◽  
Decomposition Products ◽  
Product Composition ◽  
Excess Base

The intramolecular decomposition products of bicyclo[3,3,1]nonan-9-ylidene, generated by thermal decomposition of the sodium salt of bicyclo[3,3,1]nonan-9-one-tosylhydrazone, have been investigated in protic and aprotic solvents and also without solvent. When bicyclo[3,3,1]nonan-9-ylidene is generated in the presence of excess base in aprotic solvents product analysis indicates that 1,3 insertion is predominant with some carbene rearrangement. When a protic solvent is used the product composition indicates a predominantly cationic intermediate. Decomposition of the carbene in the presence of a limited amount of base, even under aprotic conditions, gives rise to products resulting from both cationic and carbenoid intermediates.

On reaction kinetics for the thermal decomposition of hydrogen sulfide

AIChE Journal ◽  
1999 ◽  
Vol 45 (2) ◽  
pp. 383-389 ◽  
Author(s):  
Kunal Karan ◽  
Anil K. Mehrotra ◽  
Leo A. Behie
Keyword(s):  
Thermal Decomposition ◽  
Hydrogen Sulfide ◽  
Reaction Kinetics
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