Corn stover thermal decomposition in pyrolytic and oxidant atmosphere

Conesa, Juan A.; Urueña, Ana; Dı́ez, David

doi:10.1016/j.jaap.2014.01.010

Cited by 16 publications

(10 citation statements)

References 30 publications

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“…As expected, an increase in oxygen presence causes a rise in the CO 2 concentration and a gradual decrease of CO (Figure a). A high concentration of H 2 , CH 4 , and C 2 H 4 was also observed, which is consistent with thermal characterization of different biomass, e.g., ref . Couto et al, in their experimental and numerical studies on gas formation from coffee husk, described that the most important fraction, accounting for more than 70 wt %, is formed of light gases, namely, CO, H 2 , CH 4 , and CO 2 , which coincides with the results of the present work.…”

Section: Resultssupporting

confidence: 93%

Semivolatile and Volatile Compound Evolution during Pyrolysis and Combustion of Colombian Coffee Husk

et al. 2016

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Thermal characterization of coffee husk (Coffea arabica) from Colombian coffee has been studied. Different products, mostly volatile and semi-volatile compounds, were analyzed paying special attention to 16 polycyclic aromatic hydrocarbon classified by Environmental Protection Agency (EPA) as priority pollutants, frequently used for checking toxicity in environmental samples. Fixed amount of raw material was

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Section: Resultssupporting

confidence: 93%

Semivolatile and Volatile Compound Evolution during Pyrolysis and Combustion of Colombian Coffee Husk

et al. 2016

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“…The decomposition of any biomass can be considered as the superposition of this main components (Manyà and Arauzo, 2008). This process is characterized by combustion of the residue formed, pyrolysis and oxidative pyrolysis (Conesa et al, 2014).…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Kinetic parameters of red pepper waste as biomass to solid biofuel

Maia

Morais

2016

Bioresource Technology

299

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This work aimed to study the kinetic of thermal degradation of red pepper waste as solid biofuel to bioenergy production. The thermal degradation experiments were conducted at three heating rates, 5°C/min, 7.5°C/min and 10°C/min in a thermogravimetric analyzer and oxidative atmosphere. The kinetic analysis was carried out applying the isoconversional model of Ozawa-Flynn-Wall. The activation energy was considerate low and varied 29.49-147.25k J/mol. The enthalpies revealed the energy difference between the reagent and the activated complex agreed with activation energies, the values of the pre-exponential factor indicated empirical first order reactions, Gibbs free energy varied from 71.77 kJ/mol to 207.03 kJ/mol and the changes of entropies had negative values, indicating that the degree of disorder of products formed through bond dissociations was lower than initial reactants. The calorific value was 19.5 MJ/kg, considered a relevant result for bioenergy production.

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“…Nevertheless, it is not defined how to check if certain experimental tests results are affected or not by the energy release during the decomposition reactions. Some results collected in the literature [22,23] seem to reflect the self-heating effect on the decomposition process results of different non-hazardous materials. In [22], where the authors studied pyrolysis and combustion characteristics of some types of pellets, the TG and DTG curves of some test under air atmosphere show an unusual behaviour, similar to the effect shown in [1] and associated with the self-heating phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Self-heating evaluation on thermal analysis of polymethyl methacrylate (PMMA) and linear low-density polyethylene (LLDPE)

Alonso

Lázaro

et al. 2022

J Therm Anal Calorim

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Thermal analysis has been proven to be an efficiently technique to analyse thermal decomposition reactions of different type of materials. This technique is widely used in different fields. Among them, fire science, where polymeric materials are very common, has a particular issue, being the combustion reactions recurrent on these analyses. Thermal analysis has different particularities depending on the studied material. For instance, polymeric materials could undergo different decomposition reactions that are highly dependent on definition of the thermal analysis boundary conditions. The International Confederation for Thermal Analysis and Calorimetry (ICTAC) (Vyazovkin et al. in Thermochim Acta 590:1–23, 2014) and standards (ISO 11358-1. Plastics—Thermogravimetry (TG) of polymers—Part 1: General principles. ISO. 2014; https://www.iso.org/standard/59710.html. Accessed 31 Jan 2022), (ISO 11357-1. Plastics — Differential scanning calorimetry (DSC) — Part 1: General principles. ISO. 2016; https://www.iso.org/standard/70024.html. Accessed 31 Jan 2022) stablish how to set-up these boundary conditions in the thermogravimetric (TG) and differential scanning calorimetry (DSC) standards. As far as initial amount of sample mass is concern, some discrepancies can be found between the standards. For instance, the standards suggest a sample mass between 10 and 100 mg for TG and between 2 and 40 mg for DSC, whereas the ICTAC recommendations suggests that the sample mass times the heating rate should not exceed 100 mg K·min−1 in thermo-oxidative decomposition analysis, which is equivalent to samples masses lower than 10 mg for heating rates of 10 K·min−1, or lower than 5 mg for heating rates of 20 K·min−1. This discrepancy may lead to obtain different results from the tests. Additionally, according to the thermal and thermo-oxidative decomposition of polymers, the ICTAC remarks the influence on the results of the sample thicknesses, carrier gas and heating rates, but it does not analyse the influence of self-heating as it does for the hazardous materials. This work presents a study of the self-heating influence in the thermal decomposition processes of two widely used polymers as poly methyl methacrylate (PMMA) and linear low-density polyethylene (LLDPE). TG/DSC tests are used to evaluate the thermal decomposition processes. Boundary conditions of the tests definition as sample mass, atmospheres, and heating rate are considered to evaluate its influence on the polymers self-heating effect on the thermal decomposition. It also includes how to check if TG/DSC tests follows the theoretical principles of the thermal analysis, or if the results are affected by the self-heating. In the present study, a series of 32 experimental tests has been performed, analysing 16 boundary conditions. These experimental tests allow evaluating the influence of selected boundary conditions on the mass loss, the heat flux, and the materials decomposition reactions. Additionally, we analyse the effect of the boundary conditions on the temperature of the sample. Results show the impact of each different boundary conditions of the self-heating effect, and its influence in the final thermal decomposition measured and they represent an aid to define the suitable conditions to perform TG/DSC test on PMMA and LLDPE, or similar polymer materials. This is done by the evaluation of the influence of the self-heating in parameters as the sample temperature lags defined in [1], the reactions heat fluxes, and the difference between the sample and the programmed temperature. It is also analysed the influence of the auto-ignition temperature in the thermal analysis. It is remarkable the PMMA auto-ignition temperature effect on the TG/DSC results. Finally, some useful recommendations have been defined.

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Corn stover thermal decomposition in pyrolytic and oxidant atmosphere

Cited by 16 publications

References 30 publications

Semivolatile and Volatile Compound Evolution during Pyrolysis and Combustion of Colombian Coffee Husk

Semivolatile and Volatile Compound Evolution during Pyrolysis and Combustion of Colombian Coffee Husk

Kinetic parameters of red pepper waste as biomass to solid biofuel

Self-heating evaluation on thermal analysis of polymethyl methacrylate (PMMA) and linear low-density polyethylene (LLDPE)

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