Pyrolysis Characteristics of Rice Husk Using TG-DTG Analysis

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.

Pyrolysis Characteristics of Oil Sands

2012 ◽  
Vol 614-615 ◽  
pp. 111-114 ◽  
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.

Study on Thermogravimetry and Pyrolysis Dynamics of Tung Oil

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.

Pyrolysis Characteristics of Pine Powder and Polyvinyl Chloride of Municipal Solid Waste in Thermogravimetric Analyzer

2013 ◽  
Vol 781-784 ◽  
pp. 2009-2012 ◽  
Author(s):  
Hai Yu Meng ◽  
Shu Zhong Wang ◽  
Lin Chen ◽  
Jun Zhao ◽  
Zhi Qiang Wu
Keyword(s):  
Weight Loss ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Heating Rate ◽  
Polyvinyl Chloride ◽  
Heating Rates ◽  
Pyrolysis Characteristics ◽  
Thermogravimetric Analyzer ◽  
Tg And Dtg ◽  
Obvious Weight Loss

The pyrolysis characteristics of pine powder and polyvinyl chloride (PVC), respectively representing the biomass and plastics components of municipal solid waste, were studied in a thermogravimetric analyzer, and the influence of heating rate on pyrolysis characteristics was also investigated. The pyrolysis temperature was heated from ambient up to 900 °C at different heating rates including 10, 20 and 40 °Cžmin-1. The pyrolysis of pine powder was composed of two obvious weight loss phases, which were dehydration and the decomposition of cellulose and hemicellulose. The lignin in pine powder decomposed over a broad temperature range until 900°C. The pyrolysis of PVC was complicated, and included the release of hydrogen chloride (HCl), the formation of hydrocarbons. Besides, the additives in PVC decomposed at about 600 °C. The TG and DTG curves of pyrolysis for pine powder and PVC were similar at different heating rates, however, each weight loss phase of pyrolysis was shifted to high temperature with increasing the heating rate.

A Kinetic Study of Co-Pyrolysis of Coal and Spent Mushroom Compost (SMC)

2013 ◽  
Vol 781-784 ◽  
pp. 2406-2410 ◽  
Author(s):  
Zhi Qiang Wu ◽  
Shu Zhong Wang ◽  
Qi Xing Guo ◽  
Jun Zhao ◽  
Lin Chen ◽  
...  
Keyword(s):  
Activation Energy ◽  
Chemical Compounds ◽  
Initial Step ◽  
Mass Ratio ◽  
Intensive Study ◽  
Heating Rates ◽  
Mushroom Compost ◽  
Spent Mushroom Compost ◽  
Pyrolysis Characteristics ◽  
Fwo Method

Co-utilization of coal and biomass has been shown as an effective way to reduce the carbon footprint. Pyrolysis technology not only transform carbonaceous materials such as coal and biomass into various chemical compounds and fuels, but also as the initial step of the thermochemical conversation. For the sake of a better understanding of the co-thermal conversation, it is very necessary to get a intensive study on the co-pyrolysis of coal and biomass. In this paper the co-pyrolysis characteristics of coal and spent mushroom compost (SMC) were investigated through an thermogravimetry analyzer from ambient temperature to 950 °C at different heating rates (10, 20 and 40 °C/min) under nitrogen condition. Kinetic parameters were determined by the by the Flynn-Wall-Ozawa (FWO) method. It was found that the activation energy decreased with the increasing of the biomass mass ratio, but with the biomass ratio reached 0.75 the activation energy increased again. This may be involved with the negative synergies between the biomass and coal. The results could provide useful information for the further study on the co-pyrolysis of coal and MSC.

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

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.

Pyrolysis Characteristics and Kinetics of Low Rank Coal

2011 ◽  
Vol 695 ◽  
pp. 493-496 ◽  
Author(s):  
Yong Hui Song ◽  
Jian Mei She ◽  
Xin Zhe Lan ◽  
Jun Zhou
Keyword(s):  
Weight Loss ◽  
Heating Rate ◽  
Frequency Factor ◽  
Low Rank ◽  
Coal Pyrolysis ◽  
Pyrolysis Characteristics ◽  
Second Stage ◽  
Thermo Gravimetric Analyzer ◽  
Kinetics Of ◽  
Pyrolysis Kinetic

The pyrolysis characteristics of Jianfanggou(JFG) coal was studied using a thermo-gravimetric analyzer and the pyrolysis kinetic parameters were calculated at the different heating rate. The results showed the DTG curves under different heating rate had three peaks and the corresponding temperature were 100°C, 470°C and 750°C, the pyrolysis process can be divided into three stages conclusively. The maximum weight loss rate at 470°C indicated the major weight loss occurred in the second stage. The Tb, Tf and T∞ obtained under experiment situation. The results of the JFG coal pyrolysis kinetic showed the Tb, Tf and T∞ increased gradually with the accretion of the heating rate. In the meantime, the variation of frequency factor was consistent with the trend of activation energy.

A Kinetic Study of Wetland Plant Suaeda salsa L. Pyrolysis Using Thermogravimetric Analyzer

2013 ◽  
Vol 848 ◽  
pp. 126-130
Author(s):  
Hua Xiao Yan ◽  
Hui Zhao ◽  
Qi Liu ◽  
Yan Xiang Ai ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Three Dimensional ◽  
Nitrogen Atmosphere ◽  
Suaeda Salsa ◽  
Good Prospect ◽  
Heating Rates ◽  
Thermogravimetric Analyzer ◽  
Exponential Factors ◽  
Pyrolysis Feedstock ◽  
Diffusion Function

The Suaeda salsa L. has been discovered to be a great potential as a new kind of renewable energy. The pyrolytic characteristics and kinetics of S. salsa were investigated at heating rates of 5, 10, 20, 30°C/min under nitrogen atmosphere respectively. The most probable mechanism function was deduced using Popescu method, which is a three-dimensional diffusion function (), and n=-2/3. Activation energy and pre-exponential factors were studied through the FWO, KAS and Popescu methods. The results showed that the activation energy increase as the pyrolysis process and three stages were observed in the TG-DTG curves of S.salsa. The results showed that S.salsa as a pyrolysis feedstock has a great potential and a good prospect in bio-oil production.

scholarly journals Kinetic analysis of the pyrolysis of apricot stone and its main components via distributed activation energy mode

BioResources ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 1187-1204
Author(s):  
Huanhuan Ma ◽  
Yimeng Zhang ◽  
Liangcai Wang ◽  
Zhengxiang Zhu ◽  
Yu Chen ◽  
...  
Keyword(s):  
Activation Energy ◽  
Energy Distribution ◽  
Apparent Activation Energy ◽  
Early Stage ◽  
Conversion Degree ◽  
Heating Rates ◽  
Continuous Increase ◽  
Thermogravimetric Analyzer ◽  
Energy Mode ◽  
Main Components

The kinetics of pyrolysis of apricot stone and its main components, i.e., lignin, cellulose, and hemicellulose, were investigated via distributed activation energy mode. Experiments were done in a thermogravimetric analyzer at heating rates of 10, 20, 30, and 40 K·min-1 under nitrogen. The activation energy distribution peaks for the apricot stone, lignin, cellulose, and hemicellulose were centered at 246, 318, 364, and 170 kJ·mol-1, respectively. The activation energy distribution for the apricot stone slightly changed; lignin exhibited the widest distribution; and cellulose exhibited the highest activation energy at a conversion degree (α) of less than 0.75. At low pyrolysis temperatures (400 K to 600 K), the pyrolysis of hemicellulose was the main pyrolysis reaction. The apparent activation energy for the apricot stone mainly depended on the pyrolysis of hemicellulose and a small amount of lignin, and the activation energy was low in the early stage of pyrolysis. With the continuous increase in the pyrolysis temperatures (600 K to 660 K), the thermal weight loss of cellulose and lignin was intense. The apparent activation energy for the apricot stone mainly resulted from the pyrolysis of cellulose and lignin, and a higher activation energy was observed in the later stage of pyrolysis.

MODEL FREE KINETICS ANALYSIS OF IMPERATA CYLINDRICA (LALANG)

2016 ◽  
Vol 78 (8-3) ◽  
Author(s):  
Olagoke Oladokun ◽  
Arshad Ahmad ◽  
Tuan Amran Tuan Abdullah ◽  
Bemgba Bevan Nyakuma ◽  
Syie Luing Wong
Keyword(s):  
Activation Energy ◽  
Biomass Conversion ◽  
Frequency Factor ◽  
Isoconversional Methods ◽  
Green Energy ◽  
Imperata Cylindrica ◽  
Heating Rates ◽  
Model Free ◽  
Solid Biofuel ◽  
Kinetics Of

This study is the first attempt at investigating the solid state decomposition and the devolatilization kinetics of Imperata cylindrica (lalang) grass termed the “farmer’s nightmare weed” as a potential solid biofuel of the future. Biomass conversion technologies such as pyrolysis and gasification can be utilized for future green energy needs. However an important step in the efficient utilization and process optimizing of biomass conversion processes is understanding the thermal decomposition kinetics of the feedstock. Consequently, thermogravimetric analysis (TGA) of Imperata cylindrica was carried out in the temperature range of 30-1000 °C at four heating rates of 5, 10, 15, and 20 K min-1 using Nitrogen at a flow rate of 20 L min-1 as purge gas. Using the TGA results, the kinetic parameters activation energy (Ea) and pre-exponential frequency factor (ko) of the grass were estimated via the model free or isoconversional methods of Kissinger and Starink. The results obtained for Kissinger model were 151.36 kJ moI-1 and 5.83 x 109 min-1 for activation energy and pre-exponential frequency factor respectively. However, Starink model activation energy and pre-exponential frequency factor were a function of conversion (α) with average values of 159.93 kJ mol-1 and 6.33 x 1022 min-1 respectively. 

scholarly journals Pyrolysis kinetics and thermal decomposition behavior of polycarbonate - a TGA-FTIR study

2014 ◽  
Vol 18 (3) ◽  
pp. 833-842 ◽  
Author(s):  
Esin Apaydin-Varol ◽  
Sevgi Polat ◽  
Ayse Putun
Keyword(s):  
Activation Energy ◽  
Fourier Transform ◽  
Reaction Order ◽  
Fourier Transform Infrared ◽  
Pyrolysis Kinetics ◽  
Heating Rates ◽  
Exponential Factor ◽  
Thermogravimetric Analyzer ◽  
Fourier Transform Infrared Spectrometer ◽  
Infrared Spectrometer

This study covers the thermal degradation of polycarbonate by means of Thermogravimetric Analyzer coupled with Fourier transform infrared spectrometer (TGA-FTIR). Thermogravimetric analysis of polycarbonate was carried out at four different heating rates of 5, 10, 15, and 20?C per minute from 25?C to 1000?C under nitrogen atmosphere. The results indicated that polycarbonate was decomposed in the temperature range of 425-600?C. The kinetic parameters, such as activation energy, pre-exponential factor and reaction order were determined using five different kinetic models; namely Coast-Redfern, Friedman, Kissinger, Flynn-Wall-Ozawa (FWO), and Kissinger-Akahira-Sunose (KAS). Overall decomposition reaction order was determined by Coats-Redfern method as 1.5. Average activation energy was calculated as 150.42, 230.76, 216.97, and 218.56 kJ/mol by using Kissinger, Friedman, FWO, and KAS models, respectively. Furthermore, the main gases released during the pyrolysis of polycarbonate were determined as CO2, CH4, CO, H2O, and other lower molecular weight hydrocarbons such as aldehydes, ketones and carbonyls by using thermogravimetric analyzer coupled with Fourier transform infrared spectrometer.

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