Petrographical, chemical and FT-IR properties of a suberinitic coal from Aydin–Germencik area, Western Turkey

Sütcü, Emine Cicioğlu; Toprak, Selami Koçak

doi:10.1016/j.coal.2013.06.005

Cited by 21 publications

(3 citation statements)

References 33 publications

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“…ASTMD 5865 standard procedures (Sutcu et al, 2013) were used to determine gross calorific values of each sample. According to fuel wood standards, to obtain calorific value of fuel wood, oven dried samples are used.…”

Section: Calorific Valuementioning

confidence: 99%

Evaluation of Energy Properties of Lesser Known Native Species; Nataw (<i>Xylopia parviflora</i>)

Bandara

Leelarathna

2019

J Environ Prof Sri Lanka

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The most common forms of biomass available in Sri Lanka are fuel wood. Among fuel woods Hevea brasiliensis (rubber) play major role as firewood to fulfill energy requirements. Especially industries demanded by rubber are not enough to meet the demand of fire wood. In this context, traditional users of fuelwood face difficulties in maintaining a stable supply of fuelwood. Therefore, there is an essential need in identifying possible, potential and high efficient biomass energy source to fulfill energy requirement in the country according to country's energy policy targets.This study was designed to evaluate energy and mechanical properties of Nataw (Xylopia parviflora) to see its applicability as fuel wood in biomass boilers. To study the fuel wood characteristics of Nataw (Xylopia parviflora), individuals were categorized in to three diameter classes dbh class (5cm -15cm, 15cm -25cm ,25cm -35cm). In each individual four samples were taken from a wood disk extracted at breast height (1.3m). Moisture content, density, specific gravity, ash content, volatile matter, fixed carbon and biomass/ash ratio were measured from five individuals from each diameter class. Certain characteristics including moisture content, density, specific gravity, and ash content had no significant difference among three dbh classes. Volatile matter content was significantly higher and fixed carbon content was significantly lower than the other two types of dbh classes in 25cm -35cm diameter class, the largest diameter class. When compare energy characteristics of Xylopia parviflora with Hevea brasiliensis, moisture content (31.22%) ash content (1.24%) were lower than the rubber. However Calorific values (18.92 kJ/g) and FVI (3055) higher than the rubber concluding Xylopia parviflora could perform better than rubber as a fuel wood in biomass boilers.

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Section: Calorific Valuementioning

confidence: 99%

Evaluation of Energy Properties of Lesser Known Native Species; Nataw (<i>Xylopia parviflora</i>)

Bandara

Leelarathna

2019

J Environ Prof Sri Lanka

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“…However, the macroscopic characteristics of coal spontaneous combustion are the macroscopic manifestations of the changes in the microscopic surface structure of coal. Many methods are used to describe the chemical structure of organic matter, including thermogravimetric analysis–infrared spectroscopy (TG-FTIR) method, pyrolysis-mass spectrometry (MS) method, and X-ray photoelectron spectroscopy (XPS). , Among them, TG-FTIR has the characteristics of simple operation, low cost, and excellent effect. Many scholars have also made breakthroughs in the fields of coal pyrolysis characteristics and oxidation kinetics using this method.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties and Key Groups Evolution of Low-Temperature Oxidation for Bituminous Coal under Lean-Oxygen Environment

Liu

Wen

et al. 2021

ACS Omega

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To deeply explore the spontaneous combustion disaster of coal caused by air leakage and oxygen supply, low-temperature coal oxidation experiments under different oxygen concentrations (DOC) were carried out. Within the coal spontaneous combustion characteristic measurement system, a synchronous thermal analyzer (STA) and a Fourier transform infrared spectrometer (FTIR), the macro laws of gas and heat generation under DOC are analyzed, and the mechanism of the development of coal spontaneous combustion restricted by the lean-oxygen environment is also revealed. The results show that the change of oxygen concentration (OC) does not affect the critical temperature value and gas index change trend, but the lean-oxygen environment reduces the gas concentration and heat production rate very obviously. According to the temperature of the intersection, OC needs to be lowered to less than 5% when preventing spontaneous combustion of coal. The chain thermal reaction lags in the lean-oxygen environment, and the pyrolysis activity is significantly reduced. Meanwhile, the temperature points at T 6 and T 7 show significant differences. Furthermore, with increasing OC and temperature, the content of the aliphatic hydrocarbon presents an overall trend of first increasing, then decreasing, and continuously increasing after stage IV. It is concluded that • OH, aliphatic hydrocarbons, aromatic hydrocarbons, and carboxyl groups are the key groups for the coal spontaneous combustion evolution under DOC. To combine the spontaneous combustion reaction of coal in the DOC environment, the reaction path of the index gas in the macroscopic phenomenon and the reason for the concentration differences are revealed, the mechanism for exotherm varies caused by OC is clarified, and the microscopic inhibition affection on the chain reaction within the lean-oxygen environment is also explored. The results put forward the key groups evolution mechanism under the DOC for coal oxidation, which could provide the technical guidance for the fire prevention and control on coal mines.

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“…Coal structures have been studied using a variety of chemical methods, such as proximate analysis, elemental analysis, and solvent extraction . Coal samples and resultant fragments or products have been characterized by spectral or chromatographic methods, , such as infrared (IR) spectroscopy, nuclear magnetic resonance (NMR), X-ray diffractometry, and gas chromatography–mass spectrometry (GC–MS). , However, these methods provide only partial or empirical structures, or derive molecular structures from a fragment of the macromolecular structure of coal.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Insight into Coal Structure: Establishing a Chemical Model for Yuzhou Lignite

Wang

Guo

et al. 2016

Energy Fuels

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Because of their complex supermolecular structure, coal structures are challenging. We have tried to establish a novel method to construct a three-dimensional chemical model with proper reactivity for Yuzhou lignite using experimental and theoretical methods. Structural units of the Yuzhou lignite were built using elemental analysis, infrared analysis, 13 C nuclear magnetic resonance spectra, and density functional theory calculation. A three-dimensional chemical model was built in a periodic box in order to rationalize intra-and intermolecular interactions. To confirm the validity of the proposed model, we compared bond cracking pathways occurring during pyrolysis experiments using thermal gravimetric analysis and numerical dynamic reactive simulations employing the ReaxFF of thermal cracking of the model that we proposed. Experimental and numerical simulations results agreed, validating our building procedure. Therefore, this model could reflect both the basic structural characteristics and the thermal reactivity of Yuzhou lignite.

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Petrographical, chemical and FT-IR properties of a suberinitic coal from Aydin–Germencik area, Western Turkey

Cited by 21 publications

References 33 publications

Evaluation of Energy Properties of Lesser Known Native Species; Nataw (<i>Xylopia parviflora</i>)

Evaluation of Energy Properties of Lesser Known Native Species; Nataw (<i>Xylopia parviflora</i>)

Thermal Properties and Key Groups Evolution of Low-Temperature Oxidation for Bituminous Coal under Lean-Oxygen Environment

Theoretical and Experimental Insight into Coal Structure: Establishing a Chemical Model for Yuzhou Lignite

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