Kinetics analysis of mechano-chemically and thermally synthesized Cu by Johnson–Mehl–Avrami model

Sheibani, S.; Ataie, A.; Heshmati-Manesh, S.

doi:10.1016/j.jallcom.2007.01.133

Cited by 20 publications

(14 citation statements)

References 15 publications

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“…The general kinetic equation for the heterogeneous solidstate thermal transformation in TPR can be described as [7,[11][12][13]15,[17][18][19][20]26,27] …”

Section: Calculation Of the Activation Energies For The Thermal Decommentioning

confidence: 99%

“…TG analysis may be conducted under isothermal [13] or non-isothermal conditions [14][15][16]. In early research, the isothermal condition was usually performed but it would be inappropriate to use this if a physicochemical process reached its maximum reaction rate at the beginning of the transformation.…”

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confidence: 99%

“…Considering that the dynamic investigations of CP have rarely been reported in previous studies, the activation energy during thermal decomposition was calculated using the isoconversional method of Ozawa-Flynn-Wall [18][19][20] at four different heating rates: 5, 7.5, 10 and 15 K/min. The reaction order was then calculated through the Avrami theory [13,21,22] at seven temperature points. The conclusions of this study are expected to make contributions to industrial applications of this organic compound for the control of air-pollutant gases.…”

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confidence: 99%

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Kinetic calculations for the thermal decomposition of calcium propionate under non-isothermal conditions

Niu

Han

2011

Chin. Sci. Bull.

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Calcium propionate (CP) is shown to be useful for simultaneous SO 2 /NO reduction in coal-fired power plants and its thermal decomposition characteristics are measured by thermogravimetric analysis in a feasibility study into more complete reduction of these hazardous gases. Calcium carbonate (CC), which has been used primarily for in-furnace desulfuration, was used for comparison. The thermal decomposition of this organic calcium-based sorbent began at low temperature, i.e. the carboxylic radical was evaporated from 565 K to 759 K for CP and the corresponding mass loss percentage was 47.79%. The residual was subsequently decomposed to release carbon dioxide between 843 K and 1012 K. The latter phase of the process occurred more readily than with CC because of the loose structure of CP resulting from evaporation of the carboxylic radical in the low temperature zone, which could be seen directly by scanning electron microscope. The maximum mass loss rates of this phase occurred at temperatures of 972 K and 1012 K for CP and CC, respectively. The Ozawa-Flynn-Wall method was used to calculate the activation energy during the thermal decomposition process at heating rates of 5, 7.5, 10 and 15 K/min. The result further confirmed the multistage characteristic of CP thermal decomposition, which could be seen in differential thermogravimetry curves. The reaction orders of CP in the conversion range 20%−80%, calculated using the Avrami theory were from 0.061 to 0.608, smaller than those of CC, which were 1.647 to 2.084. Sulfur dioxide (SO 2 ) and nitric oxide (NO) emitted from coal-fired power plants cause serious environmental problems and therefore many technologies for the reduction of these two hazardous gases have been explored [1,2]. Among these technologies, the wet-spray of organic calcium-based sorbents has the potential for simultaneous SO 2 and NO abatement. Calcium-based sorbents [3,4], such as calcium magnesium acetate (CMA), calcium acetate (CA), calcium formate (CF), calcium benzoate (CB) and calcium propionate (CP), can produce hydrocarbon fragments (CH i ) and Ca-based compounds during pyrolysis and so can combine the reburning process for NO reduction and impregnation of Ca-based compounds into the furnace for SO 2 capture. Thus, *Corresponding author (email: cml@sdu.edu.cn) investment and the running costs could be significantly reduced if this technology could be extended to coal fired power plants. conducted laboratoryscale experiments with a down-fired pulverized coal combustor operated at 80 kW to investigate the performance of the above organic sorbents for control of air-pollutant gases under a number of conditions, obtaining satisfactory results. CMA and CP have been used as the deicing agent and food preservative, respectively, and the recent researches showed these compounds could reduce both SO 2 and NO. Increasing interest is being shown in these environment-friendly calcium salts. They achieved 70%-80% NO and SO 2 reduction efficiencies using wet-spray injection at a calcium-to-sulfur m...

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“…The general kinetic equation for the heterogeneous solidstate thermal transformation in TPR can be described as [7,[11][12][13]15,[17][18][19][20]26,27] …”

Section: Calculation Of the Activation Energies For The Thermal Decommentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Kinetic calculations for the thermal decomposition of calcium propionate under non-isothermal conditions

Niu

Han

2011

Chin. Sci. Bull.

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“…However, the consolidation behavior of mechanochemical synthesized nano-crystalline Cu has not yet been studied. In our previous works [11,12], we investigated the synthesis, mechanism, and kinetics of nano-crystalline Cu production using mechano-chemical route. Furthermore, we also analyzed the effect of a process control agent on the consolidation behavior of nano-crystalline Cu powder [13].…”

Section: Introductionmentioning

confidence: 99%

Consolidation of nano-crystalline copper powder by cold and hot pressing

et al. 2011

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This paper investigates preparation of bulk nano-structured Cu through cold and hot pressing. In particular, the effects of different consolidation parameters, such as temperature and pressure, on the properties of bulk nano-structured samples were studied. Microstructure, density, hardness, and electrical conductivity showed strong dependence on the consolidation parameters. All results were compared with those for micron-size Cu powder. Relatively fully dense compacts with minimal grain growth up to 57 nm, maximum hardness of 83 Vickers, and electrical resistivity of 1.93 × 10 −8 Ω.m could be achieved.

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“…[8] It has been shown that enhanced reaction rates can be achieved and dynamically maintained during milling as a result of microstructural refinement and mixing processes accompanying repeated fracture, welding, and deformation of particles during collision events. [9,10] Mechanochemical synthesis using displacement reactions in high-energy ball milling has been widely investigated in order to study the changes of reactivity of solids either by milling or by postmilling operations. It has been reported that the nanostructured composites with uniform distribution of reinforcement particles could be obtained by mechanochemical synthesis.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Synthesis of Cu/Cr-Al2O3 Nanocomposite by Mechanical Alloying and Heat Treatment

Sheibani

Ataie

Heshmati-Manesh

2010

Metall Mater Trans A

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Kinetics analysis of mechano-chemically and thermally synthesized Cu by Johnson–Mehl–Avrami model

Cited by 20 publications

References 15 publications

Kinetic calculations for the thermal decomposition of calcium propionate under non-isothermal conditions

Kinetic calculations for the thermal decomposition of calcium propionate under non-isothermal conditions

Consolidation of nano-crystalline copper powder by cold and hot pressing

In-Situ Synthesis of Cu/Cr-Al2O3 Nanocomposite by Mechanical Alloying and Heat Treatment

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