Thermal degradation and kinetic study of sawdusts and walnut shells via thermal analysis

Findorák, Róbert; Fröhlichová, Mária; Legemza, Jaroslav; Findoráková, Lenka

doi:10.1007/s10973-016-5264-6

Cited by 22 publications

(12 citation statements)

References 21 publications

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“…Researchers have examined the biomass devolatilization products and many have developed reactivity models to calculate the kinetic parameters based on the three components classification (cellulose, hemicellulose and lignin). Biomass pyrolysis was described to a certain acceptable extent by a global irreversible first-order reaction, and the devolatilization rate is only a function of temperature [3][4][5]. However, the reaction can be demonstrated by more than one step and combines various species reactions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic parameters of the intrinsic reactivity of woody biomass and coal chars via thermogravimetric analysis

Al-Qayim

Nimmo

Hughes

et al. 2017

Fuel

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The available data on intrinsic kinetic parameters of wood char combustion is limited in the literature. The intrinsic reactivity of porous char particles reflects the variance in the pore structure resulted from various compositions of parent biomass or coal fuels. In this study detailed kinetic models for calculating the intrinsic reaction rate and the Arrhenius parameters in two combustion zones are developed for the char combustion. The influence of the parent fuel composition and the thermal treatment on the char oxidative reactivity observed on the char surface area and particle density are explored through a mathematical model of the char service area and density. A higher reactivity of the wood pellets than coal and enhanced reactivity with the increasing pyrolysis temperature were observed as well.

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Section: Introductionmentioning

confidence: 99%

Kinetic parameters of the intrinsic reactivity of woody biomass and coal chars via thermogravimetric analysis

Al-Qayim

Nimmo

Hughes

et al. 2017

Fuel

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“…The other compounds were not placed because they follow the same tendency of displacement of the heating rates. Moreover, in others works, we have used a pattern of at least three TG curves for kinetic behavior analysis, as suggested by the ICTAC committee [40][41][42][43][44][45]. In a similar way, for all curves (even for those not shown), the result shows that there were no changes to the thermal behavior, and therefore the profiles of curves remained the same, that is, without apparent overlapping of thermal decomposition reactions.…”

Section: Resultsmentioning

confidence: 73%

“…Moreover, the use of this standard in kinetic analysis is very useful for future comparisons, besides allowing the reproducing of results obtained by us and also by other research groups. The kinetic methodology used in this work was proposed by Capela and Ribeiro, which is an isoconversional method and is based on approximation to the integral temperature on the convergent of a Jacobi fraction [37][38][39][40].…”

Section: Characterization By Thermal Analysismentioning

confidence: 99%

Thermal study of chalcones

Kobelnik

Ferreira

Regasini

et al. 2018

J Therm Anal Calorim

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Chalcones a-b-unsaturated ketones are found in large plant species. Synthesis of chalcones and its three analogues hydroxy group at 2 0 , 3 0 and 4 0 positions (2-4) was carried out. The studies of thermal behavior were made by thermogravimetry (TG) and differential scanning calorimetry, both under oxygen and nitrogen purge gases. In addition, the kinetic evaluation was carried out under heating rates of 5, 10 and 20°C min-1 with sample mass of 2 mg in open crucibles. The kinetic results obtained by TG analysis showed that the thermal behavior under oxygen shows that the functional hydroxy group substitution affects the thermal behavior of each molecule, with a gradual increase in the thermal decomposition. The activation energy (Ea/kJ mol-1) showed under a nitrogen purge gas that the hydroxy group at 3 0 position (3 0-hy-chalcone compound) has a different kinetic behavior, while the chalcone under oxygen showed a low activation energy when compared with the other hydroxy groups.

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“…For the low density materials like walnut shells, iced tea powder, and instant coffee, we can only get partial information from TGA, because thermal reactions will occur for these materials at high temperature. Generally, the surface water of a material releases from about 50 • C to 150 • C, then its internal water starts to release from about 200 • C. Walnut shells start to release their internal water from about 175-200 • C, but thermal destruction begins around 202 • C (Findorák et al, 2016), so we cannot get the internal water content of walnut shells directly from TGA measurement. For iced tea powder, thermal destruction happens at the lowest temperature of all the materials investigated, which is about 150 • C. For instant coffee, thermal destruction happens at 175 • C. Activated charcoal is stable during the entire heating process until 600 • C. From Table 7, we can find that surface water occupies over 80% of the total water content for activated charcoal.…”

Section: Surface and Internal Water Of Wind Tunnel Materialsmentioning

confidence: 99%

The effect of adsorbed liquid and material density on saltation threshold: Insight from laboratory and wind tunnel experiments

Hörst

et al. 2017

Icarus

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Saltation threshold, the minimum wind speed for sediment transport, is a fundamental parameter in aeolian processes. Measuring this threshold using boundary layer wind tunnels, in which particles are mobilized by flowing air, for a subset of different planetary conditions can inform our understanding of physical processes of sediment transport. The presence of liquid, such as water on Earth or methane on Titan, may affect the threshold values to a great extent. Sediment density is also crucial for determining threshold values.Here we provide quantitative data on density and water content of common wind tunnel materials (including chromite, basalt, quartz sand, beach sand, glass beads, gas chromatograph packing materials, walnut shells, iced tea powder, activated charcoal, instant coffee, and glass bubbles) that have been used to study conditions on Earth, Titan, Mars, and Venus. The measured density values for low density materials are higher compared to literature values (e.g., ∼30% for walnut shells), whereas for the high density materials,

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Thermal degradation and kinetic study of sawdusts and walnut shells via thermal analysis

Cited by 22 publications

References 21 publications

Kinetic parameters of the intrinsic reactivity of woody biomass and coal chars via thermogravimetric analysis

Kinetic parameters of the intrinsic reactivity of woody biomass and coal chars via thermogravimetric analysis

Thermal study of chalcones

The effect of adsorbed liquid and material density on saltation threshold: Insight from laboratory and wind tunnel experiments

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