A new method to calculate kinetic parameters independent of the kinetic model: Insights on CO 2 and steam gasification

Gomez, Arturo; Mahinpey, Nader

doi:10.1016/j.cherd.2014.11.012

Cited by 39 publications

(44 citation statements)

References 30 publications

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“…Unlike to the results from non-isothermal measurements, the values of activation energy grow as the conversion degree of the gasification reaction increase. This phenomenon may be due to the increase of mineral matter content in the char as the reaction proceeds [18,19]. The obtained average value of Ea amounted to 138.1 kJ/mol and is slightly lower than this obtained by using the norder model.…”

Section: Isothermal Conditionscontrasting

confidence: 57%

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

2019

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The thermogravimetric method allows to carry out measurements both in isothermal conditions for a given temperature and in non-isothermal conditions at a set heating rate. The aim of the work was to compare the process of gasification of the same coal in an atmosphere of CO2 under isothermal and non-isothermal conditions. The measurements were carried out with the use of DynTHERM Thermogravimetric analyzer by Rubotherm. Char derived from Polish bituminous coal “Janina” was used as material for gasification. In case of the isothermal method the measurements were performed at three temperatures – 850 °C, 900 °C and 950 °C, while in case of the non-isothermal method for three heating rates, i.e. 3 K/min, 5 K/min and 10 K/min. Based on the results obtained, kinetics curves of conversion degree of the gasification process were developed and kinetic parameters of the gasification reaction i.e. reaction order, activation energy and pre-exponential factor were determined. The values of the kinetic parameters obtained from measurements performed in isothermal and non-isothermal conditions were compared.

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Section: Isothermal Conditionscontrasting

confidence: 57%

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

2019

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“…41 Beath 42 and Benyon 43 divided the gasification reaction into three control zones according to the degree of influence of temperature on the gasification reaction. The main reason was due to the influence of pore diffusion during gasification.…”

Section: Gasification Kinetics Of Char Samplesmentioning

confidence: 99%

“…The main reason was due to the influence of pore diffusion during gasification. 41 Beath 42 and Benyon 43 divided the gasification reaction into three control zones according to the degree of influence of temperature on the gasification reaction. In the first region, the reaction belonged to the chemical reaction control.…”

Section: Gasification Kinetics Of Char Samplesmentioning

confidence: 99%

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

Guo

Huang

Gong

et al. 2019

Asia-Pacific J Chem Eng

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In this study, the rapid pyrolysis chars of Hami bituminous coal and its liquefaction residue were prepared using a high-frequency furnace. A thermogravimetric analyzer was used to investigate the gasification reactivity and determine the mixing ratio of coal and its liquefaction residue. In addition, a scanning electron microscope, a physisorption analyzer, and a laser raman spectrometer were used to characterize the physicochemical properties of samples. Furthermore, kinetics analysis using the isoconversional method was conducted. The results showed that the gasification reactivity was affected by gasification temperature, pore structure, and carbon structure. When the gasification temperature increased to 1300°C, the gasification reactivity of the liquefaction residue char was close to that of coal char. From the gasification reactivity point of view, the liquefaction residue could be utilized as a raw material in entrained-flow gasification. The mixing ratio of the raw coal to the liquefaction residue was preferably 2:1. The research on activation energy showed that the gasification process belonged to pore diffusion control in the range of temperatures investigated. Specifically, there was a synergistic effect between the coal char and the liquefaction residue char in co-gasification, which was beneficial to the gasification reaction. study on high-temperature cogasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue. Asia-Pac J Chem Eng. 2020;15:e2376. https://doi.

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“…The conversion profiles during the reduction reaction showed no specific trend for all samples. However, a kinetic model that was developed by Gomez and Mahinpey [2] could be used to estimate the kinetic parameters of the reduction reaction. Considering that the surface reaction was the controlling step; hence, the equation used [2] :

where; t X is residence time (min); X is conversion (-); T is absolute temperature (K); G(X) is conversion dependent function (-); k o is the frequency factor (1/min); E r is activation energy of reduction reaction (J/mol); and, R is the universal gas constant (J/mol K).…”

Section: Datamentioning

confidence: 99%

“…If the reaction rate at a constant conversion is only a function of temperature, the following assumption applies [2] :

…”

Section: Datamentioning

confidence: 99%

X-ray diffraction and TGA kinetic analyses for chemical looping combustion applications

2018

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Synthesis and characterization of supported metal-based oxygen carriers were carried out to provide information related to the use of oxygen carriers for chemical looping combustion processes. The Cu, Co, Fe, Ni metals supported with Al2O3, CeO2, TiO2, ZrO2 were prepared using the wetness impregnation technique. Then, the X-ray Diffraction (XRD) characterization of oxidized and reduced samples was obtained and presented. The kinetic analysis using Thermogravimetric analyzer (TGA) of the synthesized samples was conducted. The kinetics of reduction reaction of all samples were estimated and explained.

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A new method to calculate kinetic parameters independent of the kinetic model: Insights on CO 2 and steam gasification

Cited by 39 publications

References 30 publications

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

X-ray diffraction and TGA kinetic analyses for chemical looping combustion applications

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A new method to calculate kinetic parameters independent of the kinetic model: Insights on CO 2 and steam gasification

Cited by 39 publications

References 30 publications

Comparison of CO2 gasification of coal in isothermal and non-isothermal conditions

Comparison of CO2 gasification of coal in isothermal and non-isothermal conditions

A study on high‐temperature co‐gasification reactivity characteristics and kinetics analysis of Hami coal and its liquefaction residue

X-ray diffraction and TGA kinetic analyses for chemical looping combustion applications

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Product

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Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions

Comparison of CO₂ gasification of coal in isothermal and non-isothermal conditions