A Tga-MS Investigation of the Effect of Heating Rate and Mineral Matrix on the Pyrolysis of Kerogen in Oil Shale

Huang, Yi; Fan, Chun‐An; Han, Xiangxin; Jiang, X

doi:10.3176/oil.2016.2.03

Cited by 20 publications

(4 citation statements)

References 29 publications

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“…All the results of the thermogram characterization of PCL-g-MA initial temperature ( T i ), T max , final temperature ( T f ) and residue at 550 °C of a decomposition process obtained at different heating rates are summarized in Table S9 (supplementary material part) . The above results indicate that with an increasing heating rate, both T i and T max increased [ 79 ]. While there was a small amount of residual ash for PCL-g-MA above 500 °C, there was no residual found in pure PCL and MA.…”

Section: Resultsmentioning

confidence: 98%

Thermal Stability of Polycaprolactone Grafted Densely with Maleic Anhydride Analysed Using the Coats–Redfern Equation

Thangunpai

et al. 2022

Polymers

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The plastic waste problem has recently attracted unprecedented attention globally. To reduce the adverse eff ects on environments, biodegradable polymers have been studied to solve the problems. Poly(ε-caprolactone) (PCL) is one of the common biodegradable plastics used on its own or blended with natural polymers because of its excellent properties after blending. However, PCL and natural polymers are difficult to blend due to the polymers’ properties. Grafted polymerization of maleic anhydride and dibenzoyl peroxide (DBPO) with PCL is one of the improvements used for blending immiscible polymers. In this study, we first focused on the effects of three factors (stirring time, maleic anhydride (MA) amount and benzoyl peroxide amount) on the grafting ratio with a maximum value of 4.16% when applying 3.000 g MA and 1.120 g DBPO to 3.375 g PCL with a stirring time of 18 h. After that, the grafting condition was studied based on the kinetic thermal decomposition and activation energy by the Coats–Redfern method. The optimal fitting model was confirmed by the determination coefficient of nearly 1 to explain the contracting volume mechanism of synthesized PCL-g-MA. Consequently, grafted MA hydrophilically augmented PCL as the reduced contact angle of water suggests, facilitating the creation of a plastic–biomaterial composite.

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Section: Resultsmentioning

confidence: 98%

Thermal Stability of Polycaprolactone Grafted Densely with Maleic Anhydride Analysed Using the Coats–Redfern Equation

Thangunpai

et al. 2022

Polymers

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“…This may be due to the coking reaction of hydrogen-depleted substances during the diffusion in the pyrolysis furnace with the increase of temperature made aromatic hydrocarbon tend to coke before volatilization, forming solid products or coke [ 42 – 44 ]. The presence of Cu m Ni n /SA significantly increased the probabilities of the above coking reaction, leading to a reduction of the relative content of aromatic hydrocarbons [ 14 , 45 , 46 ]. The presence of aromatic hydrocarbons weakened the stability of SO and is of toxicity in use [ 38 , 47 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Double Transition Metal Salt Catalyst on Fushun Oil Shale Pyrolysis

Liu

Pan

Guo³

et al. 2020

Scanning

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Shale ash (SA) as the carrier, the ratio of Cu to Ni in the Cu-Ni transition metal salt being, respectively, 1 : 0, 2 : 1, 1 : 1, 1 : 2, 0 : 1, the double transition metal salt catalyst (CumNin/SA) was prepared to explore the effect of such catalysts on the pyrolysis behavior and characteristics of Fushun OS. The research results show that the temperature ( T max ) corresponding to the maximum weight loss rate decreased by 12.9°C, 4.0°C, and 3.6°C; and the apparent activation energy decreased by 35.2%, 33.9%, and 29.6%, respectively, after adding catalysts Cu0Ni1/SA in pyrolysis. The addition of Cu0Ni1/SA and Cu2Ni1/SA further improves the shale oil (SO) yield of 3.5% and 3.1%, respectively. Cu0Ni1/SA produces more aromatic hydrocarbons, which, however, weakens the stability of SO and is of toxicity in use. After analyzing the pyrolysis product—semicoke (SC) and SO—with ATR-FTIR and GC-MS methods, CumNin/SA promotes the secondary cracking and aromatization of OS pyrolysis, increasing the content of the compound of olefins and aromatics in SO, and hastening the decomposition of long-chain aliphatic hydrocarbons to short-chain aliphatic hydrocarbons.

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“…Many scholars have studied the yield and quality of shale oil based on operating parameters such as final pyrolysis temperature [10][11][12], heating rate [13][14][15][16] and residence time [17,18]. For example, Huang et al [19] investigated the influence of heating rate on the matrix pyrolysis of kerogen in oil shale using thermogravimetry-mass spectrometry (TG-MS), and found that the olefin/alkane ratio increased as the heating rate increased. Huang et al [20] reported that a significant amount of n-alkanes was converted into cycloalkanes and olefins by the secondary cracking reaction as the pyrolysis temperature increased from 485 °C to 590 °C, and there were formed oxygencontaining organic substances such as phenols, alcohols, esters and ketones in shale oil.…”

Section: Introductionmentioning

confidence: 99%

The effect of pyrolysis conditions on the composition of Chinese Jimsar shale oil using FT-IR, 1H-NMR and 13C-NMR techniques

Dai¹,

Guo²,

Huang³

et al. 2022

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Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) were used to characterize the functional groups and structural parameters of shale oil obtained from the pyrolysis of Chinese Jimsar oil shale under different process conditions: pyrolysis temperature 480, 500, 520, 550 °C, residence time 10, 20, 30, 40 min and heating rate 2, 5, 8, 10 °C/min. The results show that the main substances in shale oil are aliphatic components, mainly -CH 2 with antisymmetric stretching vibrations. The longest aliphatic chain of shale oil is at the pyrolysis temperature of 520 °C, the residence time of 20 min and the heating rate of 5 °C/min. The relative content of aromatics in shale oil is less than 20%. Di-substitution is the main substitution mode of the benzene ring, accounting for more than 45%. The results also indicate that the relative content of oxygen-containing functional groups (C-O and C=O) is much smaller than that of -CH 2 and -CH 3 , while the relative content of C-O is higher than that of C=O functional groups. The increase of temperature, heating rate and residence time contributes to the formation of aromatic compounds.

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A Tga-MS Investigation of the Effect of Heating Rate and Mineral Matrix on the Pyrolysis of Kerogen in Oil Shale

Cited by 20 publications

References 29 publications

Thermal Stability of Polycaprolactone Grafted Densely with Maleic Anhydride Analysed Using the Coats–Redfern Equation

Thermal Stability of Polycaprolactone Grafted Densely with Maleic Anhydride Analysed Using the Coats–Redfern Equation

Effect of Double Transition Metal Salt Catalyst on Fushun Oil Shale Pyrolysis

The effect of pyrolysis conditions on the composition of Chinese Jimsar shale oil using FT-IR, 1H-NMR and 13C-NMR techniques

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