Journal Article10.1021/ACS.ENERGYFUELS.6B02176
Effects of Metamorphism and Deformation on the Coal Macromolecular Structure by Laser Raman Spectroscopy
81
TL;DR: In this article, experiments were conducted using coal samples with different metamorphic degrees and deformation types from different regions of Hebei, Henan, Shanxi, and Anhui province, followed by laser Raman spectral analysis.
read more
Abstract: Metamorphism and deformation significantly affect the macromolecular structure of coal. In this study, experiments were conducted using coal samples with different metamorphic degrees and deformation types from different regions of Hebei, Henan, Shanxi, and Anhui province, followed by laser Raman spectral analysis. The results indicated that the Raman spectrum of all coal samples consist of two characteristic peaks, namely the D peak and the G peak, ranging from 1336.7 cm–1 to 1360 cm–1 and from 1591.2 cm–1 to 1600.6 cm–1, respectively. Simultaneously, with the metamorphic degree of coal increasing, certain change rules were observed in both strong and weak tectonically deformed coals: G and D peaks were gradually separated and the sharpness of these peaks was clearly enhanced. In addition, the D-peak position, full width at half maximum for the G-peak (fwhm-G), and the intensity ratio between the D and G-peaks (ID/IG) decreased, but the G-peak position and d(G–D) values increased, while the analysis resu...
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Structure and fractal characteristic of micro- and meso-pores in low, middle-rank tectonic deformed coals by CO2 and N2 adsorption
TL;DR: In this paper, the structure and fractal characteristic of micro-pores and mesopores in low, middle-rank (maximum vitrinite reflectance, R o, max ǫ = 0.65-1.34%) tectonic deformed coals (TDCs) were revealed by combining low temperature N 2 /CO 2 adsorption (LPN 2/CO 2 GA).
162
Insight into the macromolecular structural differences between hard coal and deformed soft coal
TL;DR: In this article, Fourier transform infrared (FTIR) spectral and X-ray photoelectron spectrometer (XPS) measurements were conducted on soft and hard coals with metamorphism varying from bituminous coal to anthracite.
116
The adsorption-swelling and permeability characteristics of natural and reconstituted anthracite coals
Qinghe Niu,Qinghe Niu,Liwen Cao,Shuxun Sang,Shuxun Sang,Xiaozhi Zhou,Xiaozhi Zhou,Zhenzhi Wang,Zhiyong Wu +8 more
TL;DR: In this article, the authors investigated the adsorption capacity, swelling effect and permeability characteristic of coal seams with and without tectonic damage, the natural coal and reconstituted coal manufactured via simulating in situ geological conditions were investigated.
93
Raman Spectroscopy as a Versatile Tool for Investigating Thermochemical Processing of Coal, Biomass, and Wastes: Recent Advances and Future Perspectives
Xu Jun,He Qichen,Xiong Zhe,Yun Yu,Shu Zhang,Xun Hu,Long Jiang,Sheng Su,Song Hu,Yi Wang,Jun Xiang +10 more
TL;DR: Raman spectroscopy, as a rapid, high-precision, and nondestructive tool, can be used for analyzing the samples from gas to solid, from ex situ to in situ, from organic macromolecule to minerals as mentioned in this paper.
89
Investigation on the physicochemical structure and gasification reactivity of nascent pyrolysis and gasification char prepared in the entrained flow reactor
TL;DR: In this article, the authors investigated the changes in the structure of nascent char during lignite pyrolysis and gasification in the entrained flow reactor under N2 and CO2, respectively, and determined the selective consumption of small aromatic rings and rapid formation of oxygen-containing functional groups.
88
References
Interpretation of Raman spectra of disordered and amorphous carbon
Andrea C. Ferrari,John Robertson +1 more
TL;DR: In this paper, a model and theoretical understanding of the Raman spectra in disordered and amorphous carbon is given, and the nature of the G and D vibration modes in graphite is analyzed in terms of the resonant excitation of \ensuremath{\pi} states and the long-range polarizability of the long range bonding.
14.4K
Raman Spectrum of Graphite
F. Tuinstra,J. L. Koenig +1 more
TL;DR: Raman spectra are reported from single crystals of graphite and other graphite materials as mentioned in this paper, and the Raman intensity of this band is inversely proportional to the crystallite size and is caused by a breakdown of the k-selection rule.
10.4K
Raman spectroscopy of graphene and graphite: Disorder, electron phonon coupling, doping and nonadiabatic effects
TL;DR: In this article, the authors focus on the origin of the D and G peaks and the second order of D peak and show that the G and 2 D Raman peaks change in shape, position and relative intensity with number of graphene layers.
7.4K
Raman spectroscopy as a versatile tool for studying the properties of graphene
Andrea C. Ferrari,Denis M. Basko +1 more
TL;DR: The state of the art, future directions and open questions in Raman spectroscopy of graphene are reviewed, and essential physical processes whose importance has only recently been recognized are described.
Raman microspectroscopy of soot and related carbonaceous materials: Spectral analysis and structural information
TL;DR: In this article, experimental conditions and mathematical fitting procedures for the collection and analysis of Raman spectra of soot and related carbonaceous materials have been investigated and optimised with a Raman microscope system operated at three different laser excitation wavelengths (514, 633, and 780 nm).
4.1K