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Arrhenius parameters determination in non-isothermal conditions for mechanically activated Ag_2O-graphite mixture 被引量:1
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作者 seyed hadi shahcheraghi Gholam Reza KHAYATI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第12期3994-4003,共10页
The non-isothermal kinetics of mechanochemical reduction of Ag2O with graphite was studied by DSC and TGA with a model of fitting Malek approach and a model-free advanced isoconversional method of Vyazovkin. To evalua... The non-isothermal kinetics of mechanochemical reduction of Ag2O with graphite was studied by DSC and TGA with a model of fitting Malek approach and a model-free advanced isoconversional method of Vyazovkin. To evaluate the kinetics parameters, Ag2O–graphite mixture of as-received and milled for 2 and 4 h samples were selected. Based on the results obtained by Vyazovkin method calculation, however, the difference between the maximum and minimum values of activation energy is less than 20%-30%of the average activation energy ((99.38±2.36) kJ/mol) and thermal decomposition of mechanically activated Ag2O for 2 h is a multi-step process. Moreover, the thermal decomposition of mechanically activated Ag2O–graphite powder activated for 4 h is a single-step process (the average activation energy=(93.68±2.26) kJ/mol). The kinetics modeling shows that the complexity of thermal decomposition of as-received Ag2O–graphite mixture is higher than that of the others. While, the autocatalytic tendency of as-received Ag2O–graphite mixture is lower than that of the others. 展开更多
关键词 mechanical activation Vyazovkin method kinetic modeling Sestak-Berggren model integral master plot method silver oxide
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Kinetics analysis of non-isothermal decomposition of Ag_2O-graphite mixture 被引量:1
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作者 seyed hadi shahcheraghi Gholam Reza KHAYATI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第9期2991-3000,共10页
The thermal decomposition kinetics of Ag2O-graphite mixture was systematically studied using a differential scanning calorimeter(DSC) in terms of model-fitting Malek approach, integral master plot method and model-f... The thermal decomposition kinetics of Ag2O-graphite mixture was systematically studied using a differential scanning calorimeter(DSC) in terms of model-fitting Malek approach, integral master plot method and model-free advanced isoconversional method of Vyazovkin. The results showed that the thermal decomposition occurred in two stages. The first step was the decomposition process of Ag2 O to form porous silver particles as a complex process with the participation of at least two mechanisms, and the second step corresponded to the structural change from porous particles to silver bulk crystals as a single-step process. 展开更多
关键词 AG2O advanced isoconversional method kinetic modeling Sestak–Berggren model
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Reaction pathway and kinetics of CdO nanoparticles prepared from CdCO_3 precursor using thermal decomposition method
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作者 Gholam Reza KHAYATI seyed hadi shahcheraghi +1 位作者 Vahid LOTFI Esmael DAREZARESHKI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第4期1138-1145,共8页
The non-isothermal kinetics of CdO nanoparticles prepared from CdCO3 precursor using thermal decomposition method was investigated. A model-fitting Malek approach and a model-free advanced isoconversional method of Vy... The non-isothermal kinetics of CdO nanoparticles prepared from CdCO3 precursor using thermal decomposition method was investigated. A model-fitting Malek approach and a model-free advanced isoconversional method of Vyazovkin were applied to the analysis of the DSC and TGA data. The results showed that CdO nanoparticles prepared from CdCO3 followed an autocatalytic reaction. Sestak–Berggren model could favorably describe the studied reaction process. Moreover, the apparent activation energy of CdCO3 decomposition was calculated to be (119.19±9.97) kJ/mol and the explicit rate equation form of CdCO3 decomposition was established. 展开更多
关键词 CdCO_3 CdO nanoparticle kinetic modeling thermal decomposition advanced isoconversional method
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