Experimental Study on Co-Pyrolysis of Oil Sludge and Coal

The pyrolysis characteristics of oil sludge and coal mixed fuel in an argon atmosphere were studied by thermogravimetric analyzer. Factors that affect the pyrolysis process were analyzed. The pyrolysis mechanism equation of the oil sludge and coal fuel was determined. Hereafter, the dynamic properties were provided, namely the activation energy and frequency factor. In this paper, pyrolysis of the mixture occurs in six distinct steps, each accompanied by its unique reactionary mechanics. The activation energy at each step increased with respect to temperature (presenting an initial increase and subsequent decrease). as the rate of temperature increase was amplified, each respective step has its activation energy slightly reduced. Moreover, the mixture shows the influence of non-linear relationships during pyrolysis.

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Investigation of the pyrolysis characteristics and kinetics of oil-palm solid waste by using Coats–Redfern method

Energy Exploration & Exploitation ◽

10.1177/0144598719877759 ◽

2019 ◽

Vol 38 (1) ◽

pp. 298-309

Author(s):

Fredy Surahmanto ◽

Harwin Saptoadi ◽

Hary Sulistyo ◽

Tri A Rohmat

Keyword(s):

Activation Energy ◽

Solid Waste ◽

Oil Palm ◽

Frequency Factor ◽

Nitrogen Atmosphere ◽

Empty Fruit Bunch ◽

Pyrolysis Kinetics ◽

Pyrolysis Characteristics ◽

Kinetics Of

The pyrolysis kinetics of oil-palm solid waste was investigated by performing experiments on its individual components, including empty fruit bunch, fibre, shell, as well as the blends by using a simultaneous thermogravimetric analyser at a heating rate of 10°C/min under nitrogen atmosphere and setting up from initial temperature of 30°C to a final temperature of 550°C. The results revealed that the activation energy and frequency factor values of empty fruit bunch, fibre, and shell are 7.58–63.25 kJ/mol and 8.045E-02–4.054E + 04 s−1, 10.45–50.76 kJ/mol and 3.639E-01–5.129E + 03 s−1, 9.46–55.64 kJ/mol and 2.753E-01–9.268E + 03, respectively. Whereas, the corresponding values for empty fruit bunch–fibre, empty fruit bunch–shell, fibre–shell, empty fruit bunch–fibre–shell are 2.97–38.35 kJ/mol and 1.123E-02–1.326E + 02 s−1, 7.95–40.12 kJ/mol and 9.26E-02–2.101E + 02 s−1, 9.14–50.17 kJ/mol and 1.249E-01–2.25E + 03 s−1, 8.35–45.69 kJ/mol and 1.344E + 01–4.23E + 05 s−1, respectively. It was found that the activation energy and frequency factor values of the blends were dominantly due to the role of the components with a synergistic effect occurred during pyrolysis.

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Pyrolysis Characteristics of Rice Husk Using TG-DTG Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.291-294.351 ◽

2013 ◽

Vol 291-294 ◽

pp. 351-354

Author(s):

Qing Wang ◽

Chun Xia Jia ◽

Hong Peng Liu

Keyword(s):

Activation Energy ◽

Rice Husk ◽

Frequency Factor ◽

Weight Loss Curve ◽

Heating Rates ◽

Pyrolysis Characteristics ◽

Thermogravimetric Analyzer ◽

Purge Gas ◽

Arrhenius Plot Method ◽

Pyrolysis Kinetic

The rice husk from China has been non-isothermally pyrolysed on thermogravimetric analyzer(TGA). The analyses were performed at different heating rates (20, 40, 60, 80, 100°C/min) up to 900°C with nitrogen as purge gas. The weight loss curve showed that the main pyrolysis of rice husk took place in the range of 200~500°C. On the basis of experiment data, a pyrolysis kinetic model was proposed. The kinetic parameters of activation energy(E) and frequency factor(A) were obtained by the Direct Arrhenius Plot Method. There was no clear relationship between activation energy and heating rate.

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Pyrolysis Characteristics of Oil Sands

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.614-615.111 ◽

2012 ◽

Vol 614-615 ◽

pp. 111-114 ◽

Cited By ~ 1

Author(s):

Chun Xia Jia ◽

Qing Wang ◽

Xin Yu Zhang ◽

Yin Wang

Keyword(s):

Activation Energy ◽

Oil Sands ◽

Frequency Factor ◽

Weight Loss Curve ◽

Oil Sand ◽

Heating Rates ◽

Pyrolysis Characteristics ◽

Thermogravimetric Analyzer ◽

Purge Gas ◽

Pyrolysis Kinetic

Three oil sand samples from Indonesia have been non-isothermally pyrolysed on thermogravimetric analyzer (TGA). The analyses were performed at different heating rates (5, 15 and 25oC/min) up to 850oC with nitrogen as purge gas. The weight loss curve shows that the main pyrolysis of oil sand takes place in the range of 200~600oC. On the basis of experimental data, a pyrolysis kinetic model was proposed. The kinetic parameters of activation energy (E) and frequency factor (A) were obtained by Integral Method. There is no clear relationship between activation energy and heating rate.

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Study on Thermogravimetry and Pyrolysis Dynamics of Tung Oil

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.524-527.1719 ◽

2012 ◽

Vol 524-527 ◽

pp. 1719-1722

Author(s):

Jian Jun Yang ◽

Wei Sheng Guai ◽

Hong Rong Che

Keyword(s):

Activation Energy ◽

Frequency Factor ◽

Differential Method ◽

Operating Conditions ◽

Shaanxi Province ◽

Heating Rates ◽

Tung Oil ◽

Pyrolysis Characteristics ◽

Temperature Ranges ◽

Reaction Activation Energy

In this paper, Tung oil from the south of Shaanxi province was assayed, and the behavior of its thermal decomposition was investigated by thermogravimetry. The pyrolysis characteristics of Tung oil experimentally studied using thermo-gravimetric analyzer (TGA).The TG curves and DTG curves were examined under different operating conditions such as heating rate and different atmospheres. The mechanism equation of pyrolysis reaction, activation energy (E) and frequency factor (A) were obtained by using differential method to fit experimental data. The experimental results shown that there are two temperature ranges in the organic matter pyrolysis period: 350-420°C and 420-500°C in air, but 350-450°C in nitrogen. The effects on Tung oil pyrolysis of different heating rates were indistinct. The activation energy in the first period was more than that in the second period.

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Elucidating The Thermal Decomposition Mechanism and Pyrolysis Characteristics of Biorefinery-Derived Humins From Sugarcane Bagasse And Rice Husk

10.21203/rs.3.rs-1113693/v1 ◽

2021 ◽

Author(s):

Julio César de Jesus Gariboti ◽

Marina Gontijo Souza Macedo ◽

Vinícius Matheus Silva Macedo ◽

Yesid Javier Rueda-Ordóñez ◽

Emília Savioli Lopes ◽

...

Keyword(s):

Activation Energy ◽

Sugarcane Bagasse ◽

Rice Husk ◽

Isoconversional Method ◽

Reaction Model ◽

Thermochemical Conversion ◽

Thermal Decomposition Mechanism ◽

Pyrolysis Kinetics ◽

Pyrolysis Mechanism ◽

Pyrolysis Characteristics

Abstract Biomass-derived humins produced in the biorefining of biomass represent an attractive feedstock for thermochemical processes and other carbon-derived platform chemicals. However, in most works, humins are merely a by-product that is not further analyzed. This work presents the purification and characterization of humins derived from sugarcane bagasse and rice husks (H-SCB and H-RH respectively), followed by the kinetic and thermodynamic analysis of its pyrolysis. Pyrolysis was examined via thermogravimetric analysis (TGA), and a global reaction model was adopted to address pyrolysis kinetics. To understand the pyrolysis process of humins and boost the quality of fit between the kinetic model and thermoanalytical data, the analyses were based on the Vyazovkin isoconversional method. The activation energy of H-SCB increased from 166.09 to 329.76 kJ mol-1. In contrast, the activation energy of H-RH decreased from 163.31 to 84.99 kJ mol-1. According to the results of the generalized master plot approach, the governing reaction mechanism shifted among order-based models, nucleation, and diffusion-controlled particle mechanisms. Derived thermodynamic properties showed that the heat absorbed helps the humins to achieve a more ordered state close to a conversion of 0.50. As far as we know, these findings are the first reported data on the forecast kinetic curves and pyrolysis mechanism of biorefinery-derived humins from sugarcane bagasse and rice husk, and these results will enable process design for the thermochemical conversion of these emerging materials to produce energy and other products.

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Electroreduction of Cr(VI) from solutions of bifunctional alcohols

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19892638 ◽

1989 ◽

Vol 54 (10) ◽

pp. 2638-2643

Author(s):

David I. Balanchivadze ◽

Tamara R. Chelidze ◽

Jondo J. Japaridze

Keyword(s):

Activation Energy ◽

Ethylene Glycol ◽

Electrode Surface ◽

Frequency Factor ◽

Limiting Current ◽

Factor Log ◽

Standard Rate ◽

Standard Rate Constant ◽

Chromate Ion ◽

Activation Energy Of Diffusion

The effect of bifunctional alcohols ethylene glycol (EG) and 1,2-propylene glycol (1,2 PG) on the kinetic parameters for the irreversible chromate ion reduction were investigated by polarographic and coulometric methods of analysis. The electroreduction of chromate ion in neutral bifunctional alcohol solutions proceeds according to the scheme: Cr(VI)–Cr(III)–Cr(II) and the values of the standard rate constant k*0 decrease in the order H2O > EG > 1,2 PG. The values of real activation energy, Q, activation energy of diffusion, QD, and frequency factor log A° have been calculated. The obtained values of QD as well as Q proved the diffusion nature of limiting current. The values of the frequency factor log A° decrease in the order H2O > EG > 1,2 PG, which points to a less favourable orientation of the electroactive ions at the electrode surface in glycols.

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Thermogravimetric Analysis of Glucose-Based and Fructose-Based Carbohydrates

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.265 ◽

2013 ◽

Vol 805-806 ◽

pp. 265-268 ◽

Cited By ~ 1

Author(s):

Fang Ming Cui ◽

Xiao Yuan Zhang ◽

Li Min Shang

Keyword(s):

Activation Energy ◽

Thermogravimetric Analysis ◽

Kinetic Parameters ◽

Degree Of Polymerization ◽

Experiment Data ◽

Pyrolysis Characteristics ◽

The Difference ◽

Kinetic Calculations

Thermogravimetric analysis (TGA) was employed to study the pyrolysis characteristics of four glucose-based and three fructose-based carbohydrates. Kinetic parameters were calculated based on the experiment data. The results indicated that the starting and maximal pyrolysis temperatures of the glucose-based carbohydrates were increased steadily as the rising of their degree of polymerization (DP). The fructose-based carbohydrates exhibited similar pyrolysis behaviors as the glucose-based carbohydrates, but the difference was smaller. Kinetic calculations revealed that the activation energy values of the glucose-based carbohydrates were higher than those of the fructose-based carbohydrates, indicating the glucose-based carbohydrates were more difficult to decompose than the fructose-based carbohydrates.

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Meyer-Neldel Rule on thermal stability parameters (trap depth and frequency factor) of luminescence signals in quartz

10.5194/egusphere-egu21-10775 ◽

2021 ◽

Author(s):

Zuzanna Kabacińska ◽

Alida Timar-Gabor ◽

Benny Guralnik

Keyword(s):

Activation Energy ◽

Thermal Stability ◽

Hydrogen Diffusion ◽

Dose Range ◽

Accurate Determination ◽

Frequency Factor ◽

Proton Conduction ◽

High Dose ◽

Compensation Law ◽

Thermal Stability Of

Thermally activated processes can be described mathematically by the Arrhenius equation. The Meyer-Neldel Rule (MNR), or compensation law, linearly relates the pre-exponent term to the logarithm of the excitation enthalpy for processes that are thermally driven in an Arrhenian manner. This empirical rule was observed in many areas of materials science, in physics, chemistry, and biology. In geosciences it was found to uphold in hydrogen diffusion (Jones 2014a) and proton conduction (Jones 2014b) in minerals.Trapped charge dating methods that use electron spin resonance (ESR) or optically or thermally stimulated luminescence (OSL and TL) are based on the dose-dependent accumulation of defects in minerals such as quartz and feldspar. The thermal stability of these defects in the age range investigated is a major prerequisite for accurate dating, while the accurate determination of the values of the trap depths and frequency factors play a major role in thermochronometry applications.&#160;The correlation of kinetic parameters for diffusion has been very recently established for irradiated oxides (Kotomin et al. 2018). A correlation between the activation energy and the frequency factor that satisfied the Meyer&#8211;Neldel rule was reported when the thermal stability of [AlO4/h+]0 and [TiO4/M+]0 ESR signals in quartz was studied as function of dose (Benzid and Timar-Gabor 2020). Here we compiled the optically stimulated luminescence (OSL) data published so far in this regard, and investigated experimentally the thermal stability of OSL signals for doses ranging from 10 to 10000 Gy in sedimentary quartz samples. We report a linear relationship between the natural logarithm of the preexponent term (the frequency factor) and the activation energy E, corresponding to a Meyer-Neldel energy of 45 meV, and a deviation from first order kinetics in the high dose range accompanied by an apparent decrease in thermal stability. The implications of these observations and the atomic and physical mechanisms are currently studied.&#160;ReferencesBenzid, K., Timar Gabor, A. 2020. The compensation effect (Meyer&#8211;Neldel rule) on [AlO4/h+]0 and [TiO4/M+]0 paramagnetic centers in irradiated sedimentary quartz. AIP Advances 10, 075114.Kotomin, E., Kuzovkov, V., Popov, A. I., Maier, J., and Vila, R. 2018. Anomalous kinetics of diffusion-controlled defect annealing in irradiated ionic solids. J. Phys. Chem. A 122(1), 28&#8211;32Jones, A. G. (2014a), Compensation of the Meyer-Neldel Compensation Law for H diffusion in minerals, Geochem. Geophys. Geosyst., 15, 2616&#8211;2631Jones, A. G. (2014b), Reconciling different equations for proton conduction using the Meyer-Neldel compensation rule, Geochem. Geophys. Geosyst., 15, 337&#8211;349

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