Nuclear magnetic resonance surface relaxivity of coals
2019年3月1日 · To obtain a standard surface relaxivity for PSD measurements of coals, we performed NMR, low-temperature N2 adsorption (LTNA), and mercury intrusion porosimetry …
Pore structure characterization of coal by NMR cryoporometry
2017年2月15日 · NMR cryoporometry was adopted to the characterization pore size distribution in coal. NMR intensity result for the coal was calibrated to get reliable pore size distribution. NMR …
FTIR and 13C NMR Investigation of Coal Component of Late …
2011年11月1日 · Two separated components, vitrinite and barkinite, and one associated coal sample obtained from South China were studied by Fourier transform infrared spectroscopy …
NMR of Coals and Coal Products - ScienceDirect
1991年1月1日 · The chapter discusses the nuclear magnetic resonance (NMR) of coals and coal products. Of the various analytical methods available, NMR spectroscopy has proved to be of …
Structural characterization analysis and macromolecular model ...
2023年9月1日 · The macromolecular structure model of coal was constructed, and the 13 C-NMR and density simulation calculation of the molecular model was carried out to verify the …
Experimental study of spontaneous imbibition from coal based on …
2025年2月20日 · During spontaneous imbibition, low-field nuclear magnetic resonance techniques were used to test the T 2 spectra and imaging (MRI) of coal samples, enabling the …
NMR: A Powerful Tool in the Characterization of Coal Tar Pitch
2003年6月7日 · The application of NMR to coal tar pitch (CTP) characterization provides valuable information about its structure. The DEPT sequence is revealed as a useful tool to identify the …
Correction of sideband effects of nuclear magnetic resonance …
A method for correcting the sideband effects in coal NMR spectra is proposed based on 13 C CP-MAS NMR and 13 C CP-MAS/TOSS NMR spectra, which could reduce errors caused by the …
Characterizing Moisture and Gas Content of Coal by Low-Field NMR …
2007年10月1日 · This paper investigates the potential for coal characterization by low-field NMR. Low-field NMR detects hydrogen-bearing molecules and, in reservoir rock samples, …
Permeability evolution of deep-buried coal based on NMR …
2024年2月15日 · In this study, permeability and nuclear magnetic resonance (NMR) tests were conducted on coal specimens under triaxial conditions. Based on the evolution of relaxation …