Catalytic effect of metal chlorides on coal pyrolysis and gasification part I. Combined TG-FTIR study for coal pyrolysis

Liu, Longlong; Kumar, Sunel; Wang, Zhihua; He, Yong; Liu, Jianzhong; Cen, Kefa

doi:10.1016/j.tca.2017.07.007

Cited by 63 publications

(29 citation statements)

References 31 publications

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“…It can be to claime that water-soluble minerals of salty coal (sodium chloride, sodium and calcium sulfates) give the process of formation and conversion (combustion) of volatile substances a significant catalytic effect. The same effect was observed in manuscript [5]. Native water soluble minerals have strong influence on decarboxylation reactions too (Fig.2).…”

Section: Fig1 the Content Of Macroelements In Organic Mass Of Coal supporting

confidence: 82%

Catalytic influence of native minerals on thermochemical conversion of salty coals

Fateyev¹,

Shendrik²

2019

Chemical Technology and Engineering. Proceedings.2019.№1

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The possibility of involvement of salty coal (SC) into the fuel base of Ukraine is considered. SC has high fuel indexes, but has an abnormal level of alkali metals in its composition. The changes of ash content and elemental composition of coal after water extraction are shown. The influence of alkali and alkaline earth metals salts on thermochemical conversion of salty coal at different temperatures and particle size of coal is determined.

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Section: Fig1 the Content Of Macroelements In Organic Mass Of Coal supporting

confidence: 82%

Catalytic influence of native minerals on thermochemical conversion of salty coals

Fateyev¹,

Shendrik²

2019

Chemical Technology and Engineering. Proceedings.2019.№1

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“…The phase of metal chloride has changed due to the preparation of char by pyrolysis at 1000 • C, then the new phase may catalyze gasification process. In the previous study [15,23], the morphs of KCl, CaCl 2 , and NiCl 2 are confirmed to become KCl, CaCO 3 and CaCl 2 , Ni after pyrolysis respectively, resulting in the different mechanism of each sample. XRD measurements were carried out to find out the mechanism of each catalyst, and the spectra of three samples after gasification at 1000 • C is exhibited in Figure 6.…”

Section: Mechanism Of Catalytic Gasificationmentioning

confidence: 88%

“…To remove the interferences of inherent minerals in coal ash, the original coal samples were demineralized by acid-washing process (HCl and HF). The details of acid washing procedure can be found in our previous works [23,25]. The coal sample after treatment was named as AW and the raw sample was named as RAW.…”

Section: Char Preparationmentioning

confidence: 99%

Kinetics and Mechanisms of Metal Chlorides Catalysis for Coal Char Gasification with CO2

He¹,

Yuan²,

Wang³

et al. 2020

Catalysts

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The gasification experiments of coal chars with CO2 were carried out isothermally, with K, Ca, Ni, and Zn chloride catalysts, adopting a thermal gravimetric analyzer (TGA) from 800 to 1100 °C. The kinetic characteristic of the samples were described using the volumetric model (VM), the grain model (GM), and the random pore model (PRM). The morphology patterns of the samples were tested applying X-ray diffraction (XRD) and the catalytic mechanisms concerning the phase changes were proposed. The results confirm that the gasification rate and char reactivities are enhanced by K, Ca and Ni chlorides, while ZnCl2 inhibited the process. The catalysis ability shows the following cation order: Ca > K > Ni > Zn. Among the models described above, PRM was proven to give the best fitting value and hence adopted to kinetics parameters calculation. The activation energies in promoting conditions were lower than that of the uncatalyzed cases. In view of the catalytic mechanism, the K metals tend to form intermediate complexes and repeatedly connect with coal char, while the Ca species may follow the oxidation-reduction mechanism and the Ni metals catalyze the gasification process.

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“…To model the chemical regenerators, the focus should be placed on calculating the heat absorbed by chemical endothermic reactions and the compositions out of chemical reformers. So far, various chemical endothermic reactions have been used for thermochemical waste heat recuperation [36][37][38][39][40]. Steam reforming experiments of methane [34], methanol, and dimethyl ether [41] have been carried out to obtain characteristics data under some working conditions.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Design and Performance Calculation of the Thermochemical Reformers

Pan

Cheng

et al. 2019

Energies

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Thermodynamic design methods and performance calculation models for chemical reformers that can be used to recuperate exhaust heat and to improve combustion quality are investigated in this paper. The basic structure of the chemical reformer is defined as series-wound reforming units that consist of heat exchangers and cracking reactors. The CH4-steam reforming reaction is used in the chemical reformers and a universal model of this reaction is built based on the minimization of Gibbs free energy method. Comparative analyzes between the results of the calculation and a plasma-catalyzed CH4-steam reforming reaction experiment verify that this universal model is applicable and has high precision. Algorithms for simulation of series-wound reforming units are constructed and the complexity of the chemical reformers is studied. A design principle that shows the influence of structural complexity on the quantity of recovered heat and the composites of the reformed fuel can be followed for different application scenarios of chemical reformers.

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Catalytic effect of metal chlorides on coal pyrolysis and gasification part I. Combined TG-FTIR study for coal pyrolysis

Cited by 63 publications

References 31 publications

Catalytic influence of native minerals on thermochemical conversion of salty coals

Catalytic influence of native minerals on thermochemical conversion of salty coals

Kinetics and Mechanisms of Metal Chlorides Catalysis for Coal Char Gasification with CO2

Thermodynamic Design and Performance Calculation of the Thermochemical Reformers

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