Investigation of adsorption and desorption of acetylene on hard coal samples from Polish mines

Dudzińska, Agnieszka

doi:10.1016/j.coal.2014.03.007

Cited by 18 publications

(10 citation statements)

References 27 publications

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“…The increase in the grade of metamorphism and decrease in coal porosity resulted in the deterioration of sorption capacity of tested coals with respect to propylene. The electrostatic interactions between oxygen-containing reactive centers on coal surface and π electrons of the double bonds between carbon atoms play also a significant role in sorption of unsaturated hydrocarbons on coals [9,10,28,29]. Coals of higher oxygen and moisture content, and therefore of higher number of reactive oxygen-containing groups, tended to sorb higher volumes of propylene.…”

Section: Resultsmentioning

confidence: 99%

“…This in turn causes the underestimation of the concentrations of gaseous indicators of the self-heating process and an incorrect assessment of the development of this process. The gases adsorbed on coal in the highest amounts include the unsaturated hydrocarbons-such as ethylene, propylene, and acetylene-which reduces their applicability in the assessment of the self-heating process progress [9][10][11]. This is particularly important in the case of coals with high sorption capacity, and with long distances between the self-heating center and the measurement point of concentrations of gaseous process indicators.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

2017

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Propylene and acetylene are released to mine air with the increase in the temperature of self-heating coal. Concentrations of these gases in mine air are applied as indicators of the progress of the self-heating process. Hydrocarbons emitted from the self-ignition center are sorbed on coal, while migrating through the mine workings. Coal crushed during the mining process is characterized by a high sorption capacity, which facilitates the sorption phenomena. This results in the decrease in hydrocarbons content in mine air, and in the subsequent incorrect assessment of the development of the self-heating process. The results of the experimental study on propylene and acetylene sorption on Polish coals acquired from operating coal mines are presented in this paper. Bituminous coal is characterized by a high sorption capacity with respect to unsaturated hydrocarbons, like propylene and acetylene. The sorbed volumes depend on the grade of metamorphism, porosity, and chemical characteristics of coal. Low level of metamorphism, increased porosity, and oxygen content result in higher sorption capacity of coals. The reduction in grain size of coals also results in the increased sorption capacity with respect to hydrocarbons. The most significant increase in the volumes of sorbed propylene and acetylene with the decrease in grain class was observed for coals of low porosity, high grade of metamorphism, and low to medium sorption capacities. The 10-fold decrease in coal grain size resulted in the 3 to 6-fold increase in the volume of sorbed propylene, and 2-fold increase for acetylene. The decrease in grain size results in higher accessibility of pore structure, increased pore volume and area, and higher number of active centers interacting with hydrocarbons of dipole characteristics. For coals with low grade metamorphism, high porosity, and high sorption capacity the volumes of sorbed propylene and acetylene increased only slightly with the decrease in coal grain size.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

2017

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“…In case of desorption process some of porosity could be broken that closed the porosity. As a result, desorption process was much slower than adsorption process due to poor porosity [14]. The maximal surface area was obtained at ZnO/AC-KOH.…”

Section: Nitrogen Adsorption Isotherm Analysismentioning

confidence: 98%

Physical-chemical Characterization of Nano-Zinc Oxide/Activated Carbon Composite for Phenol Removal from Aqueous Solution

Allwar

Setyani

Sugesti

et al. 2021

Bull. Chem. React. Eng. Catal.

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Oil palm shell was used as a precursor for preparation of activated carbon using different chemical activations (potassium hydroxide (KOH), zinc chloride (ZNCl2), and phosphoric acid (H3PO4)). Each activated carbons (AC) was mixed with nano-zinc oxide to form a composite. From the gas sorption analyzer, it is showed that nitrogen adsorption isotherms show Type II for ZnO/AC-KOH and ZnO/AC-ZnCl2 corresponding to the micro- and mesoporous structures, respectively. However, the nitrogen adsorption isotherm of ZnO/AC-H3PO4 exhibits the Type I with predominantly microporous structures. The SEM micrographs produced unsmooth surface and different pore sizes. The XRD patterns at 2θ of 25.06° and 26.75° were come from amorphous activated carbon. The peak intensity of ZnO was weak due to low concentration of zinc precursor. However, the ZnO of ZnO/AC-ZnCl2 showed strongly peak intensity. The effectiveness of the composites was examined for phenol removal determined by UV-Vis Spectrophotometer method. The equilibrium adsorption follows the Langmuir and Freundlich models according to the best correlation coefficient (R2). The kinetic model was only obtained for the pseudo-second-order with the best linearity of the correlation coefficient (R2). The results of this study showed that the oil palm shell has a great potential for ZnO/AC with excellent adsorptive property. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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“…Majority of sorption research on hard coal presented in literature is performed on powder samples or on samples of granulation not higher than 0,9mm. As a result of such drastic fragmentation lost of primary pore structure can be observed as well as lost of chemical character of outer coal grains surface, which can have influence on higher values of sorbed amount of gas/vapors [20,21]. In order to characterize the research material there were analysis carried out: porosimetry and densimetry analysis, helium density measurements.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…The study found that the sorption isotherms of hydrocarbon vapors on hard coal in the investigated pressures ranges and temperatures were irreversible, in each of examined cases open hysteresis loop was easily visible (the predominance of sorption processes in the microporous coal structure) [20,21].…”

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confidence: 99%

Energetic effects of adsorption of C₆-C₈hydrocarbons on hard coal samples of different metamorphism

Orzechowska-Zięba

Nodzeński

2017

E3S Web Conf.

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Abstract. The analysis of sorption equilibrium of aliphatic saturated and unsaturated hydrocarbons on low and medium rank coals were performed. Isosteric sorption enthalpy correlation with the degree of fill of sorption capacity was presented for the low rank coal. There was found a crucial role of primary pore structure in the coal grains in the process of sorption, especially in case of temperature anomalies occurrence. Hexane differently than other hydrocarbons of longer chains, represent the property of micropore penetration. Due to literature the presence of double bound in other molecules causes difficulties with penetration into porous structure of coal.

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Investigation of adsorption and desorption of acetylene on hard coal samples from Polish mines

Cited by 18 publications

References 27 publications

Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

Physical-chemical Characterization of Nano-Zinc Oxide/Activated Carbon Composite for Phenol Removal from Aqueous Solution

Energetic effects of adsorption of C₆-C₈hydrocarbons on hard coal samples of different metamorphism

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Investigation of adsorption and desorption of acetylene on hard coal samples from Polish mines

Cited by 18 publications

References 27 publications

Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

Effect of Coal Grain Size on Sorption Capacity with Respect to Propylene and Acetylene

Physical-chemical Characterization of Nano-Zinc Oxide/Activated Carbon Composite for Phenol Removal from Aqueous Solution

Energetic effects of adsorption of C6-C8hydrocarbons on hard coal samples of different metamorphism

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Energetic effects of adsorption of C₆-C₈hydrocarbons on hard coal samples of different metamorphism