Investigation of oil-shale pyrolysis processing conditions using thermogravimetric analysis

Williams, Paul T.; Ahmad, Nasir

doi:10.1016/s0306-2619(99)00038-0

Cited by 145 publications

(67 citation statements)

References 27 publications

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“…Firstly, in lower-temperature region, from ambient temperature up to 200 °C, weight loss attributes to the loss of external moisture, of interlayer water from clay minerals and decomposition of some minor mineral matters [19]. Usually, the weight loss at this stage is used to measure water content.…”

Section: Tg and Dtg Curves Of Oil Shale Pyrolysismentioning

confidence: 99%

Study on Pyrolysis Characteristics of Huadian Oil Shale With Isoconversional Method

Wang¹,

Liu²,

Sun³

et al. 2009

Oil Shale

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In this research, thermal decomposition of Huadian oil shale was studied by thermogravimetry (TG/DTG) at different heating rates in nitrogen environment. Apparent activation energy of the pyrolysis reaction for three samples has been determined at four heating rates (10,20, 40, 100 °C/min) using Friedman's isoconversional method. Furthermore, the Sestak's complex mechanism was adopted to address mechanism of oil shale pyrolysis. The results showed that activation energy changes only slightly despite the fact that it is not a constant. In the conversion range of 0.1-0.9, the mean value of activation energies for samples OS1, OS2 and OS3 is 237.6, , and their standard deviations are 2. 3, 3.86 and 4.61, respectively.

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Section: Tg and Dtg Curves Of Oil Shale Pyrolysismentioning

confidence: 99%

Study on Pyrolysis Characteristics of Huadian Oil Shale With Isoconversional Method

Wang¹,

Liu²,

Sun³

et al. 2009

Oil Shale

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“…Thermogravimetric analysis (TGA) of oil shale samples has been extensively used as a means of determining pyrolysis characteristics and also to determine kinetic parameters [3][4][5][6][7][8]. Non-isothermal thermogravimetry (TG) has been applied in the study of the kinetics of thermal decomposition of Green River oil shale kerogen [3].…”

Section: Introductionmentioning

confidence: 99%

“…It was observed that the magnitude of the total mass loss was mainly dependent on the final temperature, as well as, to a lesser extent, on the heating rate employed. Williams and Ahmad [8] studied oil shale samples in a thermogravimetric analyzer in relation to heating rate and temperature using nonisothermal and isothermal analysis respectively. The main region of mass loss corresponding to hydrocarbon oil and gas release was between 473-893 K, and a significant mass loss at higher temperatures was attributed to carbonate decomposition.…”

Section: Introductionmentioning

confidence: 99%

Study of the Kinetics and Mechanisms of Thermal Decomposition of Moroccan Tarfaya Oil Shale and Its Kerogen

Aboulkas¹,

Harfi²

2008

Oil Shale

127

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“…Oil shale pyrolysis using thermogravimetric 20 analysis has been previously investigated 9,49,50 . It was found that, depending on the oil shale 21 type, its decomposition exhibits either single or a two-stage evolution of hydrocarbon material, in 22 the temperature range of 250 -620ºC.…”

mentioning

confidence: 99%

“…At temperatures higher than 600ºC, thermal decomposition 1 of carbonates takes place, due to the presence of minerals, such as calcite or dolomite. 2 Thermal treatment of fresh oil shale under nitrogen flow showed a two-stage decomposition 3 process ( Figure 4A and B) where the transformation step at 720ºC is most likely due to 4 carbonates decomposition 49 . Afterwards, an oxidation step allowed the combustion of residual 5 carbon from refractory material, such as heavy oils, tar-mats, coke 10 .…”

mentioning

confidence: 99%

The Oil Shale Transformation in the Presence of an Acidic BEA Zeolite under Microwave Irradiation

et al. 2014

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The transformation of an oil shale sample from the Autun Basin in the Massif Central, France, was studied using two different heating strategies: microwave irradiation and conventional heating. Microwave heating was performed using a single-mode cavity operating at a frequency of 2.45 GHz under an inert atmosphere. Heating of the sample generated liquid products of similar composition using either microwave or conventional heating. The yields of liquid products were similar in the two cases, while the overall energy requirements were much lower using microwave irradiation. The influence of water vapor on the oil shale decomposition was also studied under microwave energy. In order to simulate conversion of the organic fraction of the oil shale in the presence of an acidic zeolite catalyst, the oil shale sample was mixed with 5 wt % BEA zeolite and heated under microwave irradiation. It was found that the liquid products yield decreased along with an increase in the amount of coke produced. Gaseous and liquid products recovered showed a tendency for the production of lighter components in the presence of zeolite. The aromatic character of the oils was more important when microwaves were used, especially in the presence of zeolite.

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Investigation of oil-shale pyrolysis processing conditions using thermogravimetric analysis

Cited by 145 publications

References 27 publications

Study on Pyrolysis Characteristics of Huadian Oil Shale With Isoconversional Method

Study on Pyrolysis Characteristics of Huadian Oil Shale With Isoconversional Method

Study of the Kinetics and Mechanisms of Thermal Decomposition of Moroccan Tarfaya Oil Shale and Its Kerogen

The Oil Shale Transformation in the Presence of an Acidic BEA Zeolite under Microwave Irradiation

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