Nanopore Structure of Different Rank Coals and Its Quantitative Characterization.

Journal of Nanoscience and Nanotechnology
Xiangchun LiYangyang Meng

Abstract

Based on gas adsorption theory, high-pressure mercury intrusion (HPMI), low-temperature liquid nitrogen gas adsorption (LT-N₂GA), CO₂ adsorption, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and small-angle X-ray scattering (SAXS) techniques were used to analyze the pore structures of six coal samples with different metamorphisms in terms of pore volume, specific surface area (SSA), pore size distribution (PSD) and pore shape. Combined with the gas adsorption constant a, the influence and mechanism of the pore structure of different coal ranks on gas adsorption capacity were analyzed. The results show that there are obvious differences in the pore structure of coals with different ranks, which leads to different adsorption capacities. To a large extent, the pore shapes observed by SEM are consistent with the LT-N₂GA isotherm analysis. The pore morphology of coal samples with different ranks is very different, indicating the heterogeneity among the coal surfaces. Adsorption analysis revealed that mesopore size distributions are multimodal and that the pore volume is mainly composed of mesopores of 2-15 nm. The adsorption capacity of the coal body micropores depends on the 0.6-0.9 nm and 1.5-...Continue Reading

References

Dec 15, 2010·Environmental Science & Technology·Yangyang Liu, Jennifer Wilcox

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