XRD and TG-FTIR study of the effect of mineral matrix on the pyrolysis and combustion of organic matter in shale char

Fan, Chao; Yan, Junwei; Huang, Yi; Han, Xiangxin; Jiang, Xiumin

doi:10.1016/j.fuel.2014.09.021

Cited by 100 publications

(65 citation statements)

References 29 publications

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“…In short, the presence of sharp bands between 4000–3500 cm -1 was assigned to differently bounded kinds of water [ 18 , 41 ] while low-intensity bands at 3500–3300 and 3020–3016 cm -1 were attributed respectively to the nitrogen compounds and aliphatic structures (including CH 4 ) [ 42 ]. The main peak with the highest intensity, at 2400–2240 cm -1 , originated from CO 2 [ 18 , 41 ]. The bands around 1900–1650 cm -1 could be assigned to asymmetric stretching of C-O in carbonyl moieties from carboxylic groups, esters, ketones and aldehydes [ 9 ].…”

Section: Resultsmentioning

confidence: 99%

Use of thermal analysis coupled with differential scanning calorimetry, quadrupole mass spectrometry and infrared spectroscopy (TG-DSC-QMS-FTIR) to monitor chemical properties and thermal stability of fulvic and humic acids

2017

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Thermogravimetry–coupled with differential scanning calorimetry, quadrupole mass spectrometry, and Fourier-transform infrared spectroscopy (TG-DSC-QMS-FTIR)–was applied to monitor the thermal stability (in an N2 pyrolytic atmosphere) and chemical properties of natural polymers, fulvic (FA) and humic acids (HA), isolated from chemically different soils. Three temperature ranges, R1, 40–220°C; R2, 220–430°C; and R3, 430–650°C, were distinguished from the DSC data, related to the main thermal processes of different structures (including transformations without weight loss). Weight loss (ΔM) estimated from TG curves at the above temperature intervals revealed distinct differences within the samples in the content of physically adsorbed water (at R1), volatile and labile functional groups (at R2) as well as recalcitrant and refractory structures (at R3). QMS and FTIR modules enabled the chemical identification (by masses and by functional groups, respectively) of gaseous species evolved during thermal decomposition at R1, R2 and R3. Variability in shape, area and temperature of TG, DSC, QMS and FTIR peaks revealed differences in thermal stability and chemical structure of the samples between the FAs and HAs fractions of different origin. The statistical analysis showed that the parameters calculated from QMS (areas of m/z = 16, 17, 18, 44), DSC (MaxDSC) and TG (ΔM) at R1, R2 and R3 correlated with selected chemical properties of the samples, such as N, O and COOH content as well as E2/E6 and E2/E4 indexes. This indicated a high potential for the coupled method to monitor the chemical changes of humic substances. A new humification parameter, HTD, based on simple calculations of weight loss at specific temperature intervals proved to be a good alternative to indexes obtained from other methods. The above findings showed that the TG-DSC-QMS-FTIR coupled technique can represent a useful tool for the comprehensive assessment of FAs and HAs properties related to their various origin.

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Section: Resultsmentioning

confidence: 99%

Use of thermal analysis coupled with differential scanning calorimetry, quadrupole mass spectrometry and infrared spectroscopy (TG-DSC-QMS-FTIR) to monitor chemical properties and thermal stability of fulvic and humic acids

2017

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“…In the next decades, thermal analysis was broadly used for the investigation of petroleum products [5], as well as coal and organic matter contained rocks [6]. Also DSC technique was used for organic matter recognition in oil shales or kerogen evaluation in source rocks [6][7][8][9][10]. In most cases, the kerogen is separated from the rock [11], but some attempts to examine bulk rock were also undertaken [12,13].…”

Section: Introductionmentioning

confidence: 99%

Application of different thermal analysis techniques for the evaluation of petroleum source rocks

Labus

Matyasik

2018

J Therm Anal Calorim

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In the paper, various laboratory pyrolytic methods were used to evaluate selected petroleum source rocks. The methods used are: Rock-Eval pyrolysis, Py-GC pyrolytic technique and TG/DTG/DSC. The experiments of the last method were performed according to three different procedures. Each of them provided different, specific data. The selected rock sample material was diversified in terms of stratigraphical position, structural unit and place of collection (outcrop or borehole). Based on the Rock-Eval analysis results, kerogen in samples can be classified as type II. Additional information on the quality of pyrolysis products was obtained from the Py-GC analysis. Thanks to the combination of the all three implemented pyrolytic techniques, the quality of the generation potential of the source rocks can be evaluated in details. In some samples, the oxidation and pyrolysis of organic matter occur in two stages, what is the evidence of the complex nature of the organic substance. The maximum of pyrolysis reaction is detected by TG/DTG measurement in the range of temperature from 450 to 580°C, depending on the maturity of organic matter. The maturity level increases with the rock stratigraphic position. The proportions of loss in mass observed in respective stages of pyrolysis in course of TG/DTG experiment are in correspondence with the observations of the released fractions in the Py-GC analysis. The Carpathian Menilite shales could be classified as source rocks with high oil generation potential. Also, the Lower Silurian and Ordovician shales are characterized by high oil-producing potential with a lower content of mineral matter. Cambrian rocks show a different character and gas-prone generation potential.

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“…Moreover, the intensity of this peak decreased as the pyrolysis temperature increased, indicating that the bio-char structure was damaged at higher pyrolysis temperatures. Several new peaks appeared in CB-550, showing the presence of several minerals (Fan et al 2015). This result implied that pyrolysis at higher temperatures results in higher ash content.…”

Section: X-ray Diffraction Analysismentioning

confidence: 84%

Effect of Temperature on the Evolution of Physical Structure and Chemical Properties of Bio-char Derived from Co-pyrolysis of Lignin with High-Density Polyethylene

Chen¹,

Shi²,

Nguyen³

et al. 2016

BioResources

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Bio-chars were produced by co-pyrolysis of lignin with high-density polyethylene at 350 °C, 450 °C, and 550 °C. X-ray diffraction (XRD), Raman spectroscopy, automated surface area and pore size analysis, scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and electron spin resonance (ESR) spectroscopy were performed on bio-char to reveal the effect of temperature on its physical structure and chemical properties. All of the bio-chars demonstrated a highly disordered, turbostratic structure and exhibited a wide pore distribution. Dramatic losses of carbonyl, hydroxyl, and C-H groups indicated the development of condensed aromatic structure in the bio-chars. Specifically, biochar produced at 450 °C showed the highest degree of aromaticity, which is the relative content of aromatic structure with small fused rings and free radical concentration. This structure has more potential application in composite production and as solid fuel for its combustion or gasification. Moreover, biochar produced at 550 °C had the greatest porosity development, favoring its use as a precursor for activated carbon production.

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XRD and TG-FTIR study of the effect of mineral matrix on the pyrolysis and combustion of organic matter in shale char

Cited by 100 publications

References 29 publications

Use of thermal analysis coupled with differential scanning calorimetry, quadrupole mass spectrometry and infrared spectroscopy (TG-DSC-QMS-FTIR) to monitor chemical properties and thermal stability of fulvic and humic acids

Use of thermal analysis coupled with differential scanning calorimetry, quadrupole mass spectrometry and infrared spectroscopy (TG-DSC-QMS-FTIR) to monitor chemical properties and thermal stability of fulvic and humic acids

Application of different thermal analysis techniques for the evaluation of petroleum source rocks

Effect of Temperature on the Evolution of Physical Structure and Chemical Properties of Bio-char Derived from Co-pyrolysis of Lignin with High-Density Polyethylene

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