Non-Isothermal Kinetic Analysis of the Dehydroxylation of Kaolinite in Dynamic Air Atmosphere

Ondro, Tomáš; Húlan, Tomáš; Vitázek, I.

doi:10.1515/ata-2017-0010

Cited by 9 publications

(9 citation statements)

References 23 publications

(33 reference statements)

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“…On the other hand, the E* values corresponding to the combustion of MB-BC are just slightly higher than what would proportionally correspond for the relative MB and BC contents (100 and 91 kJ/mol, for the FWO and KAS models, respectively). In Table 7, the change of E with α, which is especially evident for MB, may be related to the complexity of the fuel composition and subsequently to the complex reactions ongoing under combustion, as it has already been observed for woody biomass [76]. The E* values here determined for BC are close to those previously obtained for a coal of the same rank and origin [23], while those of MB are in consonance with published results on the combustion of microalgae biomasses.…”

Section: Non-isothermal Kinetic Analysismentioning

confidence: 61%

Comparative Thermogravimetric Assessment on the Combustion of Coal, Microalgae Biomass and Their Blend

2019

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In this work, thermogravimetric analysis (TGA), differential thermogravimetry (DTG), and differential scanning calorimetric (DSC) were used to assess the combustion of microalgae biomass, a bituminous coal, and their blend. Furthermore, different correlations were tested for estimating the high heating value of microalgae biomass and coal, with both materials possessing similar values. TGA evidenced differences between the combustion of the studied fuels, but no relevant interaction occurred during their co-combustion, as shown by the DTG and DSC curves. These curves also indicated that the combustion of the blend mostly resembled that of coal in terms of weight loss and heat release. Moreover, non-isothermal kinetic analysis revealed that the apparent activation energies corresponding to the combustion of the blend and coal were quite close. Overall, the obtained results indicated that co-combustion with coal might be a feasible waste to energy management option for the valorization of microalgae biomass resulting from wastewater treatment.

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Section: Non-isothermal Kinetic Analysismentioning

confidence: 61%

Comparative Thermogravimetric Assessment on the Combustion of Coal, Microalgae Biomass and Their Blend

2019

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“…These results are consistent with our observation made in this work. second decomposition stage occurred in the temperature range of 200-400 °C, when all DTG curves ( Figure 2) showed that there was a primary peak of weight loss, which could be due to the process of decomposition of cellulose, hemicellulose, and part of lignin [39][40][41]. According to a report by Yu et al [24], with increasing temperature, the decomposition of cellulose increased rapidly and was almost completed at 400 °C.…”

Section: Catalytic Fast Pyrolysis Of Forestry Wood Waste (Vernicia Fomentioning

confidence: 81%

“…The second decomposition stage occurred in the temperature range of 200-400 • C, when all DTG curves ( Figure 2) showed that there was a primary peak of weight loss, which could be due to the process of decomposition of cellulose, hemicellulose, and part of lignin [39][40][41]. According to a report by Yu et al [24], with increasing temperature, the decomposition of cellulose increased rapidly and was almost completed at 400 • C. According to Biagini's report, the onset temperature of hemicellulose (xylan as model compound) was 253 • C. The cellulose exhibited the maximum weight loss in the range of 200-400 • C. The onset and maximum weight loss were 319 and 354 • C [42].…”

Section: Catalytic Fast Pyrolysis Of Forestry Wood Waste (Vernicia Fomentioning

confidence: 99%

“…The primary weight loss occurred in the temperature range of 320-400 • C. In addition, due to the complex stable aromatic rings with various branch structures, the pyrolysis of lignin has been proven to occur continuously through a range of 200-900 • C [46]. At the third stage, above 400 • C, the weight loss was slower and relatively small due to the pyrolysis of lignin and the residues of char [41,[47][48][49].…”

Section: Catalytic Fast Pyrolysis Of Forestry Wood Waste (Vernicia Fomentioning

confidence: 99%

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Catalytic Fast Pyrolysis of Forestry Wood Waste for Bio-Energy Recovery Using Nano-Catalysts

Yue

Yang

et al. 2019

Energies

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Fast pyrolysis is envisioned as a promising technology for the utilization of forestry wood waste (e.g., widely available from tree logging) as resources. In this study, the potential of an innovative approach was explored to convert forestry wood waste of Vernicia fordii (VF) into energy products based on fast pyrolysis combined with nano-catalysts. The results from fast pyrolysis using three types of nano-catalysts showed that the distribution and composition of the pyrolytic product were affected greatly by the type of nano-catalyst employed. The use of nano-Fe2O3 and nano-NiO resulted in yields of light hydrocarbons (alkanes and olefins) as 38.7% and 33.2%, respectively. Compared to the VF sample, the use of VF-NiO and VF-Fe2O3 led to significant increases in the formation of alkanes (e.g., from 14% to 26% and 31%, respectively). In addition, the use of nano-NiO and nano-Fe2O3 catalysts was found to promote the formation of acid, aromatics, and phenols that can be used as chemical feedstocks. The NiO catalyst affected the bio-oil composition by promoting lignin decomposition for the formation of aromatics and phenolics, which were increased from 9.52% to 14.40% and from 1.65% to 4.02%, respectively. Accordingly, the combined use of nano-catalysts and fast pyrolysis can be a promising technique for bio-energy applications to allow efficient recovery of fuel products from forestry wood waste.

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“…Therefore, the infected trees can be used as a renewable energy source, for example in small-scale biomass boilers. However, to use the woody biomass as an energy source, it is necessary to use it rationally and in a sustainable way [4][5][6]. On the other hand, there are still some problems in current biomass combustion furnaces, but where a kinetic analysis is a suitable tool to solve them [7,8].…”

Section: Introductionmentioning

confidence: 99%

Isothermal Kinetic Analysis of the Thermal Decomposition of Wood Chips from an Apple Tree

et al. 2021

Self Cite

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The thermal decomposition of wood chips from an apple tree is studied in a static air atmosphere under isothermal conditions. Based on the thermogravimetric analysis, the values of the apparent activation energy and pre-exponential factor are 34 ± 3 kJ mol−1 and 391 ± 2 min−1, respectively. These results have also shown that this process can be described by the rate of the first-order chemical reaction. This reaction model is valid only for a temperature range of 250–290 °C, mainly due to the lignin decomposition. The obtained results are used for kinetic prediction, which is compared with the measurement. The results show that the reaction is slower at higher values of degree of conversion, which is caused by the influence of the experimental condition. Nevertheless, the obtained kinetic parameters could be used for the optimization of the combustion process of wood chips in small-scale biomass boilers.

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Non-Isothermal Kinetic Analysis of the Dehydroxylation of Kaolinite in Dynamic Air Atmosphere

Cited by 9 publications

References 23 publications

Comparative Thermogravimetric Assessment on the Combustion of Coal, Microalgae Biomass and Their Blend

Comparative Thermogravimetric Assessment on the Combustion of Coal, Microalgae Biomass and Their Blend

Catalytic Fast Pyrolysis of Forestry Wood Waste for Bio-Energy Recovery Using Nano-Catalysts

Isothermal Kinetic Analysis of the Thermal Decomposition of Wood Chips from an Apple Tree

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