Thermokinetic parameters of the primary coal tars destruction in the presence of catalysts and polymeric materials

Balpanova, N.Zh.; Байкенов, М. И.; Gyul’maliev, A. M.; Absat, Z.B.; Batkhan, Zh.; Ma, Fei; Kim, S.V.; Baikenova, G.G.; Aitbekova, D.E.; Tusipkhan, A.

doi:10.31489/2021ch2/86-95

Cited by 3 publications

(5 citation statements)

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“…The conversion degree of sample 3 at a heating rate of 10 • C/min was 86 wt.% at 500 • C, whereas the conversion rate of sample 1 at the same temperature was 60 wt.% and of sample 2 was 69 wt.%. This confirmed our earlier conclusions in [36] on the thermal decomposition of a mixture of low-temperature coal vacuum residue resin with a chrysotile-based catalyst. We have found that the rate of vacuum residue thermal degradation depends on the qualitative composition added to the nanocatalyst.…”

Section: Discussionsupporting

confidence: 92%

Thermal Degradation Kinetics of Vacuum Residues in the Presence of Chrysotile Supported Ni-Ti Catalyst

Balpanova,

Baikenov

2023

Catalysts

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For the first time, thermal decomposition of vacuum residue and a mixture of vacuum residue with binary nanocatalysts based on leached and non-leached chrysotile with applied active metals was studied using the thermogravimetry method. It is shown that the thermokinetic parameters of decomposition of vacuum residue and its mixture with binary nanocatalyst are different. The phase composition of the binary nanocatalyst was established through X-ray phase analysis (XRD): (Mg3Si2O5 (OH), NiO and Ti (SO4)2). The quantitative content of elements on the chrysotile surface was determined using X-ray fluorescence analysis: (Ni (4.88%), Ti (7.29%), Si (24.93%), Mg (7.83%), Fe (0.69%) and S (3.89%)). Using atomic emission spectral analysis, the gross quantitative content of supported metals on chrysotile was determined: Ni (4.85%) and Ti (4.86%). A transmission electron microscope showed the presence of finely dispersed particles adsorbed on the surface of and possibly inside chrysotile nanotubes with sizes ranging from 5 to 70 nm. The acidity of the nanocatalyst obtained from the leached active-metal-supported chrysotile was 267 μmol/g and the specific surface area of the nanocatalyst was 54 m2/g. The Ozawa–Flynn–Wall (OFW) method was used to calculate the kinetic parameters of the thermal degradation of vacuum residue and the mixture of vacuum residue with nanocatalysts. Using the isoconversion method, the average values of activation energies and the pre-exponential factor were calculated: 147.55 kJ/mol and 3.37·1016 min−1 for the initial vacuum residue; 118.69 kJ/mol and 1.54·1018 min−1 for the mixture of vacuum residue with nanocatalyst obtained from non-leached chrysotile with applied metals; 82.83 kJ/mol and 2.15·1019 min−1 for the mixture of vacuum residue with nanocatalyst obtained from leached chrysotile with applied metals. The kinetic parameters obtained can be used in modeling and designing the processes of thermal degradation and hydroforming of heavy hydrocarbon raw materials.

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Section: Discussionsupporting

confidence: 92%

Thermal Degradation Kinetics of Vacuum Residues in the Presence of Chrysotile Supported Ni-Ti Catalyst

Balpanova,

Baikenov

2023

Catalysts

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“…Substitutions ( 2) and (3) provide the OFW equation ( 4) to calculate how thermal breakdown rate of catalyst mixtures with LTCR depends on inverse temperature calculated the activation energy and the preexponential multiplier [15]. Thermogravimetric (TG) curves (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Equation ( 4) implies that for a series of temperature measurements of thermal degradation of lowtemperature coal tar catalyst mixtures obtained at different β heating speeds of samples and fixed values of their transformation degree α, the graph of the function lnβ = f (1/T) gives straight lines (isoconversion lines) the tangent of the inclination of which -1.052E/R is directly proportional to the activation energy [15] (Fig. 3 a-d).…”

Section: Resultsmentioning

confidence: 99%

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Kinetics of Thermolysis of a Low-Temperature Tar in the Presence of a Catalyzer Agent with Deposited Metals

Tyanakh¹,

Байкенов²,

Gyul’maliev³

et al. 2022

Bull. of the Kar. Univ. "Chem". Ser.

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The thermal decomposition of low-temperature coal tar (LTCT) obtained from the coals of Shubarkol Komir JSC of the Republic of Qazaqstan in the presence of nanocatalysts with metal oxides (iron, cobalt and nickel) supported on microsilicate was studied for the first time. Microsilicate acts as a carrier and catalyst. Microsilicate is a product of the Karaganda silicon plant of “Tau-Ken.temir” LLP. The main chemical com-ponent of the original microsilicate is silicon oxide. The individual and chemical phase composition of the microsilicate was determined using X-ray spectral analysis. The particle size of the initial microsilicate and the mixture of microsilicate with metal oxide catalysts (nickel, cobalt, and iron) was determined using a nanosizer. Stages of thermal decomposition of LTCT and a mixture of LTCT with catalysts under conditions of programmed heating up to 640 °С in a nitrogen atmosphere have been established. On the basis of thermogravimetric analysis, the kinetic parameters (activation energy, mass loss rate, and pre-exponential fac-tor) of LTCT pyrolysis and mixture with added catalysts were determined. The modelless integral isoconversion Ozawa–Flynn–Wall method was used to determine the kinetic parameters. The values of the activation energy for the thermal destruction of the LTCT in the absence and presence of the nanocatalyst ranged from 54.04 to 297.5 kJ/mol. A kinetic compensation effect was revealed, probably due to the multi-component composition of the LTCT and the influence of added catalysts to the LTCT. The thermogravimetry method showed a high effect of the supported catalysts on the thermal degradation of LTCT. This method was used to determine the values of the activation energy and the pre-exponential degra-dation factor for the LTCT and the mixture with catalysts at different heating rates, which allows a detailed interpretation of the thermal analysis data. The obtained results of the kinetics of decomposition of LTCT can be used to create a database for mathematical modeling of the process of processing this type of raw material.

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“…NiO supported on chrysotile leads to a significant reduction of activation energy in the process of thermal destruction of primary coal tar/polymeric materials mixture [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nickel Nanopowder on the Thermal Degradation of Coal Tar Distillate

Kim¹,

Байкенов²,

Ibishev³

et al. 2022

Bull. of the Kar. Univ. "Chem". Ser.

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Regularities of influence of nickel nanpowder on the thermal degradation of coal tar distillate were determined using model-free Kissinger, Flynn-Wall-Ozawa and model-fitting Coats-Redfern methods. Coal tar distillate with a boiling point <350 °C was obtained by simple distillation of primary coal tar from the Shubarkol deposit. Nickel nanopowder was used as a catalyst and was added to coal tar distillate in a quantity of 1 % of the mass of the distillate and then the process of thermal degradation of coal tar distillate was conducted at heating rates 5, 10 and 20 °C/min in an inert gas medium. Nickel powder was obtained by high-voltage discharge impact on the dc electrolysis. X-ray diffraction (XRD) analysis showed that the obtained nickel powder has face-centered cubic structure and the average crystallite size calculated by Scherrer equation was ~ 34 nm. Calculations of activation energy were performed via processing of thermogravimetric data. The Kissinger method showed that the activation energy value decreases from 145.19 kJ/mol to 43.65 kJ/mol, by the Flynn-Wall-Ozawa (FWO) method the value decreases from 152.82 kJ/mol to 51.65 kJ/mol, and by the Coats-Redfern method the value decreases from 143.38 kJ/mol to 52.64 kJ/mol. Applicability of these methods are ensured by the high values of correlation coefficients.

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Thermokinetic parameters of the primary coal tars destruction in the presence of catalysts and polymeric materials

Cited by 3 publications

References 0 publications

Thermal Degradation Kinetics of Vacuum Residues in the Presence of Chrysotile Supported Ni-Ti Catalyst

Thermal Degradation Kinetics of Vacuum Residues in the Presence of Chrysotile Supported Ni-Ti Catalyst

Kinetics of Thermolysis of a Low-Temperature Tar in the Presence of a Catalyzer Agent with Deposited Metals

Effect of Nickel Nanopowder on the Thermal Degradation of Coal Tar Distillate

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