Changes of Aromatic CH and Aliphatic CH in In-situ FT-IR Spectra of Bituminous Coals in the Thermoplastic Range

Shin, Soon-Mo; Park, Jin-Kook; Jung, Seung Boo

doi:10.2355/isijinternational.isijint-2014-625

Cited by 24 publications

(6 citation statements)

References 28 publications

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“…The absorption of all ve composts with FTIR analysis showed similar characteristics to previous studies 26,28 . According to Shin et al 29 , the peak of aliphatic group area at 2,930 cm − 1 and 2,850 cm − 1 gradually decreased while amino acid at 1,385 cm − 1 gradually disappeared due to decomposition by bacteria. These can be used to determine the maturity degree of the compost.…”

Section: Ftir Analyses In Ve Composts At Different Composting Timementioning

confidence: 99%

Preliminary Design for Establishing Compost Maturity by Using the Spectral Characteristics of Five Organic Fertilizers

Lin

2022

Preprint

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The maturity of compost is involved in the availability of nutrients to crops and improvement of soil properties after fertilization. The determination of composts maturity mostly required analyses in the laboratory previously and it must consume a lot of time and cost. This studies were conducted to use Fourier Transform Infrared (FTIR) spectroscopy and solid 13C Nuclear Magnetic Resonance (13C NMR) spectroscopy to understand the mature characteristics of five type of common composts. The FTIR analysis showed that all composts contained aromatic groups. In addition, the surface of composts were enriched with the functional groups including hydroxyl group, carboxyl group, amino group etc. However, these functional groups changed along with maturity degree. It is preliminarily recognized that the aliphatic group located at 2,930 cm-1 and 2,850 cm-1 showed a decreasing peak, and amino acid at 1,385 cm-1 was disappearing gradually due to the decomposition by bacteria. There may be used to identify the maturity degree of composts. Productions of aromatic group at 1,650 cm-1, carboxy (-COOH) and phenolic OH groups at 1,385 cm-1 may prove the full maturity of composts. 13C NMR analysis showed that five type of matured composts are mainly consisted with aliphatic groups and aromatic groups. The surfaces of the composts contained C-O bounds (CO carbons-alcohols, ester, ethers, carbohydrates and other functional groups), COO- (carboxyl and ester carbons) and C = O bond (aldehydes and ketones). The strength of different absorptive characteristics of FTIR and 13C NMR may be a clue of the maturity of composts for future designing reference of detective instruments.

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Section: Ftir Analyses In Ve Composts At Different Composting Timementioning

confidence: 99%

Preliminary Design for Establishing Compost Maturity by Using the Spectral Characteristics of Five Organic Fertilizers

Lin

2022

Preprint

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“…Information Obtained from the FTIR Spectrum. Due to abundant previous studies of functional group evolution among various rank coals, 20,36,37,40,41,44,45 it is not the focus of the present study to analyze the FTIR characteristics of the raw coal. However, undoubtedly, coals of lower rank were enriched in aliphatic CH 2 and CH 3 , while coals of higher rank were enriched in aromatic carbons.…”

Section: Carbon Skeleton Evolution During Heat-treatingmentioning

confidence: 99%

“…Qiu et al extracted caking components from the thermoplastic material of coal pyrolysis and found that the extract mainly consisted of aliphatic branched hydrocarbons and hydrocarbons with one or more aromatic rings. Aliphatic hydrocarbons could generate hydrogen radicals, which act as stabilizers, promoting the development of liquid crystals with comparatively lower molecular weights. , Butuzova et al argued that the caking capacity of coal is correlated with aromatic hydrocarbons, which have the potential to create a somewhat organized liquid-crystalline structure with a certain level of mobility. On the contrary, the oxygen-bearing cross-linking structures in coals are recognized as a negative factor influencing plastic layer formation. ,, Mochida et al and Chen et al pointed out that oxygen-containing functional groups in coal promote the formation of isotropic structures.…”

Section: Introductionmentioning

confidence: 99%

“…Aliphatic hydrocarbons could generate hydrogen radicals, which act as stabilizers, promoting the development of liquid crystals with comparatively lower molecular weights. 20,21 Butuzova et al 22 argued that the caking capacity of coal is correlated with aromatic hydrocarbons, which have the potential to create a somewhat organized liquid-crystalline structure with a certain level of mobility. On the contrary, the oxygen-bearing crosslinking structures in coals are recognized as a negative factor influencing plastic layer formation.…”

Section: Introductionmentioning

confidence: 99%

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Inspired by the Optical Properties of Char and Coke: A Study on Differences between Them from Perspectives of Organic Elemental Contents and the Carbon Nanostructure

Guo,

Tang,

Schobert

et al. 2024

Energy Fuels

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Caking coal and noncaking coal show significantly different behaviors during thermal conversion processes. Inspired by the optical properties of chars and cokes derived from noncaking and caking coals, respectively, under four different pyrolysis conditions, elemental analysis (EA), Fourier transform infrared (FTIR), CP/MAS solid-state 13 C nuclear magnetic resonance (CP/MAS 13 C NMR), Raman spectroscopy, X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM) were jointly employed to investigate and compare their organic element contents and carbon nanostructures. The FTIR and 13 C NMR spectra demonstrate that the 500 °C/30 min pyrolysis condition has transformed the aromatic, aliphatic, and carbonyl/carboxyl structures of various rank coals to varying degrees. Higher pyrolysis temperatures and longer residence times make it difficult to relate which raw coal the pyrolysis products are to the parent coals. Raman parameters, such as AD/AG vs A(G R + V L + V R )/AD, describe a dynamic process of coal structure evolution, indicating aromatics with 3−5 rings tend to decrease, resulting in the formation of aromatics with not less than 6 rings; moreover, higher pyrolysis temperature and longer residence time enhance the Raman parameters consistency of the chars and cokes. EA shows that during the same pyrolysis process (at least higher than 750 °C), the caking coal has a higher potential to be graphited, and the graphitization potential of semianthracite and anthracite is still higher than that of other noncaking coal. Furthermore, XRD indicates the d 002 of pyrolysis products derived from caking coal is about 0.34−0.35 nm, which is generally smaller than that from noncaking coal, larger than 0.35 nm. HRTEM images reveal a direct observation of the carbon nanostructure in chars and cokes, illustrating that the carbon nanostructure derived from caking coal has a flatter arrangement while that from noncaking coal has a curlier arrangement. Oxygen is considered one of the factors that inhibits the alignment of carbon nanostructure evolution.

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“…5 presents IR spectra of eight obtained PCA samples, which have similar absorption bands. If we compare the obtained eight spectra with IR spectrum of coking coal [13], the following typical reflexes, corresponding to aliphatic and aromatic PCA components, can be underlined: (A) -aromatic CH, CH 3 (3,030-2,950 cm -1 ), (B) -aliphatic CH, CH 2 и CH 3 (2,920-2,850 cm -1 ), (C) -oscillations in the aromatic ring (1,600 cv -1 ), (D) -CH 2 и CH 3 (1,450 cm -1 ), (E) -groups of CH 3 (1,375 cm -1 ), (F) -aromatic CH outside the plane (900-700 cm -1 ) [13].…”

Section: Study Of Composition Of Petroleum Coke Additive Via Ir Spect...mentioning

confidence: 99%

Petroleum coking additive - raw material component for metallurgical coke production. Part 2. Experimental studies of obtaining a petroleum coking additive

Nasifullina¹,

Starkov²,

Gabdulkhakov³

et al. 2022

cisisr

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Petroleum coke is a potential partial replacement of coking coals (being in short supply) in manufacture of metallurgical coke; in Russia and other CIS countries it was entitled as petroleum coking additive (PCA), petroleum coke with output of volatile substances within the range 15-25 %. The second part of the work describes the results of conducted experimental researches in the field of manufacture of petroleum coke additive on the example of use of two kinds of sulfuric petroleum residues of "KINEF" JSC as raw materials: residue of atmospheric distillation and mixture of residues of vacuum distillation and visbreaking. The research was conducted for two temperature procedures within the ranges 455-465 and 475-485 qС. Eight samples of carbon material were obtained as a result of conversion, and influence of input parameters of the coking process on composition and physical-chemical properties of obtained carbon materials was established. Based on content of volatile substances in petroleum coke additive and its group chemical composition, which was determined via extraction method (content of D-, Eand J-fractions) and via infrared Fourier spectroscopy, assessment and ranging of the eight obtained PCA samples were carried out by their sintering susceptibility. Interpretation of infrared spectra of obtained PCA samples was conducted via comparison with infrared spectra of coking coal, which have identical absorption stripes. Relation between PCA sintering ability and procedure parameters of the coking process was revealed. It was determined that technological process occurring at the less coking temperature 455-465 qС provides high quality PCA forming, otherwise the procedure with higher temperature (475-485 qС).

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Changes of Aromatic CH and Aliphatic CH in In-situ FT-IR Spectra of Bituminous Coals in the Thermoplastic Range

Cited by 24 publications

References 28 publications

Preliminary Design for Establishing Compost Maturity by Using the Spectral Characteristics of Five Organic Fertilizers

Preliminary Design for Establishing Compost Maturity by Using the Spectral Characteristics of Five Organic Fertilizers

Inspired by the Optical Properties of Char and Coke: A Study on Differences between Them from Perspectives of Organic Elemental Contents and the Carbon Nanostructure

Petroleum coking additive - raw material component for metallurgical coke production. Part 2. Experimental studies of obtaining a petroleum coking additive

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