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

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.

Heat Capacities and Nonisothermal Thermal Decomposition Reaction Kinetics ofd-Mannitol

2010 ◽  
Vol 55 (1) ◽  
pp. 119-124 ◽  
Author(s):  
Bo Tong ◽  
Rui-Bin Liu ◽  
Chang-Gong Meng ◽  
Feng-Yun Yu ◽  
Shou-Hua Ji ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Reaction Kinetics ◽  
Decomposition Reaction ◽  
Heat Capacities

High-Pressure Reaction Kinetics of Hydrogen Sulfide and Uncalcined Limestone Powder

1999 ◽  
Vol 38 (10) ◽  
pp. 3802-3811 ◽  
Author(s):  
Rajeev Agnihotri ◽  
Shriniwas S. Chauk ◽  
Santhosh K. Misro ◽  
Liang-Shih Fan
Keyword(s):  
High Pressure ◽  
Hydrogen Sulfide ◽  
Reaction Kinetics ◽  
Limestone Powder ◽  
High Pressure Reaction ◽  
Kinetics Of

Kinetics for an Optimized Biosynthesis of Silver Nanoparticles Using Alfalfa Extracts

2015 ◽  
Vol 13 (3) ◽  
pp. 359-367
Author(s):  
José J. Ibarra-Sánchez ◽  
Rosalba Fuentes-Ramírez ◽  
José Antonio Reyes-Aguilera ◽  
Susana Figueroa-Gerstenmaier ◽  
Erasmo Orrantia-Borunda ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Silver Nanoparticles ◽  
Reaction Kinetics ◽  
Scale Up ◽  
Degree Of Crystallinity ◽  
Plant Metabolites ◽  
Initial Concentration ◽  
Extraction Solvent ◽  
Green Approach ◽  
Best Value

Abstract In recent years, great efforts have been directed to provide eco-friendly methods for nanoparticles (NPs) synthesis. In this endeavor, it is desired that polydispersity be as narrow as possible and that the chemical and physical properties can be controlled. In this work, silver nanoparticles (SNPs) were obtained by means of (a) a green approach (biosynthesis) using alfalfa extracts; and (b) a thermal decomposition method in organic media. As per biosynthesis, pH, initial concentration of precursor (Ag+) and extraction solvent of plant metabolites were varied in order to identify the conditions where SNP polydispersity presented a best value. When these conditions were determined, the reaction kinetics was evaluated. The rate constant and order of reaction were 7.33×10−6 L3.6/mol3.6 s, and 4.6, respectively. Also, in the biosynthesis, it was found that the size and the degree of polydispersity depend on initial concentration of precursor and the type of extractant. Thermal decomposition was performed using silver oleate as precursor in order to compare characteristics of the NPs obtained by both biosynthesis and the chemical method. According to our results, SNPs obtained through thermal decomposition showed a lower polydispersity and higher degree of crystallinity than those obtained using biosynthesis. However, the green method eliminates the use of toxic compounds, which is extremely important if these particles are intended for biomedical purposes. In addition, this is a less expensive method as compared to other chemical methods. To our knowledge, this is one of the few reports analyzing the reaction kinetics, which is extremely important if scale-up is intended.

Photolysis of hydrogen peroxide, photocatalytic effects of Cu(II) and reaction kinetics

1986 ◽  
Vol 51 (5) ◽  
pp. 973-981 ◽  
Author(s):  
Stanislav Luňák ◽  
Petr Sedlák ◽  
Josef Vepřek-Šiška
Keyword(s):  
Hydrogen Peroxide ◽  
Thermal Decomposition ◽  
Quantum Yield ◽  
Reaction Kinetics ◽  
Copper Ions ◽  
Oxidation States ◽  
Radiation Temperature ◽  
Quantum Yields ◽  
High Quantum ◽  
Catalytically Active

The quantum yield of hydrogen peroxide photolysis has been measured as a function of the concentration of photocatalytically active Cu2+ ions, intensity of photolytic radiation, temperature, and hydrogen peroxide concentration. The results obtained are consistent with the concept that high quantum yields of hydrogen peroxide photolysis (Φ >> 1) are due to thermal decomposition of hydrogen peroxide catalyzed by photochemically generated copper ions in oxidation states which are catalytically active.

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