Effect of metals and Co3O4 on the thermal decomposition reaction of sodium chlorate in an area of refuge

2020 ◽  
Vol 74 (10) ◽  
pp. 3475-3480
Author(s):  
Na Gao ◽  
Ya-qing Dai ◽  
Long-zhe Jin ◽  
Chun-guo Ma ◽  
Jian-guo Liu ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Sodium Chlorate ◽  
Decomposition Reaction

scholarly journals Coupling Effect of Metals and Oxides on the Oxygen Supply Performance of Sodium Chlorate Oxygen Candle

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Na Gao ◽  
Chunguo Ma ◽  
Kaeryaer Kariman ◽  
Jianguo Liu ◽  
Zheng Zhang ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Production Rate ◽  
Production Efficiency ◽  
Oxygen Supply ◽  
Coupling Effect ◽  
Sodium Chlorate ◽  
Decomposition Reaction ◽  
Oxygen Production ◽  
Mass Fractions ◽  
Oxygen Production Rate

In this study, to explore the influence of metals and oxides on the oxygen production rate and stability of sodium chlorate oxygen candles, 28 experimental samples were investigated. The effects of Co2O3, Co3O4, and Fe2O3 with different mass fractions on the thermal decomposition temperature and thermal decomposition rate of sodium chlorate were compared and analyzed. Co3O4 (5%) was obtained to reduce the thermal decomposition range to 260–450°C and reduce the pyrolysis interval ∆T to 46.2°C. Through the development of three metals (Fe, Mg, and Mn), under four mass fractions (2%, 4%, 6%, and 8%) mixed with Co3O4 (5%), the results of the effective oxygen production efficiency test for the thermal decomposition reaction of sodium chlorate demonstrated that Mn (6%)–Co3O4 (5%) exhibited the best catalytic and heat coupling effect; the effective oxygen production efficiency of 97.8% was achieved. Oxygen candle oxygen supply experiment was conducted; the oxygen candle composition for the test was determined to be NaClO3 (86%), Mn (6%), Co3O4 (5%), and kaolin (3%); in the four stages of the oxygen candle oxygen supply reaction test, the average oxygen supply rate reached 1.647 L/min, actual oxygen production was 28 L, and effective oxygen production rate of the oxygen candle was 53.6%. An increase of 9% was observed compared to the previous similar studies. The results of this study present a formula to optimize the oxygen supply of the oxygen candle, which is crucial for improving the oxygen supply performance of the oxygen candle.

Reactivity of the first transition row metallocenes in thermal decomposition reaction

1979 ◽  
Vol 175 (1) ◽  
pp. 63-72 ◽  
Author(s):  
L.M. Dyagileva ◽  
V.P. Mar'in ◽  
E.I. Tsyganova ◽  
G.A. Razuvaev
Keyword(s):  
Thermal Decomposition ◽  
Decomposition Reaction

Catalytic effects of nonoxide metal compounds on the thermal decomposition of sodium chlorate

1993 ◽  
Vol 32 (11) ◽  
pp. 2863-2865 ◽  
Author(s):  
Yunchang Zhang ◽  
Girish Kshirsagar ◽  
John E. Ellison ◽  
James C. Cannon
Keyword(s):  
Thermal Decomposition ◽  
Sodium Chlorate ◽  
Metal Compounds ◽  
Catalytic Effects

scholarly journals Improvement in Carbonization Efficiency of Cellulosic Fibres Using Silylated Acetylene and Alkoxysilanes

Fibers ◽  
2019 ◽  
Vol 7 (10) ◽  
pp. 84
Author(s):  
Maria Mironova ◽  
Igor Makarov ◽  
Lyudmila Golova ◽  
Markel Vinogradov ◽  
Georgy Shandryuk ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Comparative Studies ◽  
Decomposition Reaction ◽  
Activation Energies ◽  
Composite Fibers ◽  
Carbon Yield ◽  
Pyrolysis Reaction ◽  
Cellulosic Fibres

Comparative studies of the structure and thermal behavior of cellulose and composite precursors with additives of silyl-substituted acetylene and alkoxysilanes were carried out. It is shown that the introduction of silicon-containing additives into the cellulose matrix influenced the thermal behavior of the composite fibers and the carbon yield after carbonization. Comparison of the activation energies of the thermal decomposition reaction renders it possible to determine the type of additive and its concentration, which reduces the energy necessary for pyrolysis. It is shown that the C/O ratio in the additive and the presence of the Si–C bond affected the activation energy and the temperature of the beginning and the end of the pyrolysis reaction.

scholarly journals Numerical investigation of localization and suppression of thermal decomposition of forest combustible materials using specialized water supply

2018 ◽  
Vol 194 ◽  
pp. 01033
Author(s):  
Dmitrii Antonov ◽  
Geniy Kuznetsov ◽  
Alena Zhdanova
Keyword(s):  
Thermal Decomposition ◽  
Forest Fires ◽  
Large Scale ◽  
Water Film ◽  
Decomposition Reaction ◽  
Mutual Arrangement ◽  
Near Surface ◽  
The Times ◽  
Forest Combustible ◽  
Combustible Materials

The danger of forest fires and their large-scale consequences are becoming ever more complex problems for mankind every year. The results of numerical studies of heat transfer processes under suppressing the thermal decomposition reaction of forest combustible materials by films and groups of water droplets are presented. We used forest combustible materials, typical for the Siberian region. We have established the relationship between the dimensions of the heated near-surface layer of the material and the thickness of the film layer of the liquid that evaporated when the thermal decomposition reaction was suppressed in forest combustible materials. Typical times of suppression of the thermal decomposition reaction of typical forest combustible materials are given when the water film on the surface evaporates. The influence of the mutual arrangement of droplets on the surface of the forest combustible material and the temperature of the outer vapor-gas mixture on the times of suppression of its pyrolysis is revealed. The results can be used to develop technologies for extinguishing fires, containment of flame sources and combustion front.

Thermal Decomposition Kinetics of Flame Retardant Polybutylene Terephthalate Matrix Composites

2019 ◽  
Vol 956 ◽  
pp. 181-191
Author(s):  
Jian Lin Xu ◽  
Bing Xue Ma ◽  
Cheng Hu Kang ◽  
Cheng Cheng Xu ◽  
Zhou Chen ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Flame Retardant ◽  
Mass Loss Rate ◽  
Decomposition Reaction ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Heating Rates ◽  
Polybutylene Terephthalate ◽  
Kinetics Of

The thermal decomposition kinetics of polybutylene terephthalate (PBT) and flame-retardant PBT (FR-PBT) were investigated by thermogravimetric analysis at various heating rates. The kinetic parameters were determined by using Kissinger, Flynn-Wall-Ozawa and Friedman methods. The y (α) and z (α) master plots were used to identify the thermal decomposition model. The results show that the rate of residual carbon of FR-PBT is higher than that of PBT and the maximum mass loss rate of FR-PBT is lower than that of PBT. The values of activation energy of PBT (208.71 kJ/mol) and FR-PBT (244.78 kJ/mol) calculated by Kissinger method were higher than those of PBT (PBT: 195.54 kJ/mol) and FR-PBT (FR-PBT: 196.00 kJ/mol) calculated by Flynn-Wall-Ozawa method and those of PBT and FR-PBT (PBT: 199.10 kJ/mol, FR-PBT: 206.03 kJ/mol) calculated by Friedman methods. There is a common thing that the values of activation energy of FR-PBT are higher than that of PBT in different methods. The thermal decomposition reaction models of the PBT and FR-PBT can be described by Avarami-Erofeyev model (A1).

scholarly journals Impacts of Thermal Inertia Factor on Adiabatic Decomposition of 40% Mass Content DCP in Ethyl Benzene

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Xiaojuan Wu ◽  
Liping Chen ◽  
Guoning Rao ◽  
Wanghua Chen ◽  
Ruili Yin
Keyword(s):  
Thermal Decomposition ◽  
Thermal Inertia ◽  
Decomposition Reaction ◽  
Exothermic Peak ◽  
Ethyl Benzene ◽  
Mass Content ◽  
Experimental Conditions ◽  
Initial Decomposition Temperature ◽  
Thermal Hazards ◽  
Exponential Factor

To reduce the fire and explosion accident of dicumyl peroxide (DCP) in experiment and production, the thermal hazards of DCP and 40% mass content DCP in ethyl benzene (40% DCP) have been studied by the differential scanning calorimeter (DSC) and the accelerating rate calorimeter (ARC) in this paper. DSC experiment showed that ethyl benzene has no effect on the characteristic parameters of thermal decomposition of DCP, such as the temperature of the exothermic peak (Tpeak) and the decomposition energy (Ea), and the thermal decomposition reaction of 40% DCP followed the one-step reaction principle. ARC experiment showed that with the increase of inertia factor (Φ), the measured initial decomposition temperature (Ton) would be higher and the caculated Ea and pre-exponential factor (A) would be greater. It was also proved that after modification of Φ, TD24 was relatively consistent near Ton, but different at higher temperatures. Fisher's correction method was used to verify the necessity of consistency between experimental conditions and prediction conditions.

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