Nano- to micro-pore characterization by synchrotron radiation SAXS and nano-CT for bituminous coals

Yixin ZHAO, Chujian HAN, Yingfeng SUN, Nima Noraei DANESH, Tong LIU, Yirui GAO

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Front. Earth Sci. ›› 2021, Vol. 15 ›› Issue (2) : 189-201. DOI: 10.1007/s11707-021-0889-6
RESEARCH ARTICLE

Nano- to micro-pore characterization by synchrotron radiation SAXS and nano-CT for bituminous coals

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Abstract

Considering the complementarity of synchrotron radiation SAXS and nano-CT in the pore structure detection range, synchrotron radiation SAXS and nano-CT methods were combined to characterize the nano- to micro-pore structure of two bituminous coal samples. In mesopores, the pore size distribution curves exhibit unimodal distribution and the average pore diameters are similar due to the affinity of metamorphic grades of the two samples. In macropores, the sample with higher mineral matter content, especially clay mineral content, has a much higher number of pores. The fractal dimensions representing the pore surface irregularity and the pore structure heterogeneity were also characterized by synchrotron radiation SAXS and nano-CT. The fractal dimensions estimated by both methods for different pore sizes show consistency and the sample with smaller average pore diameters has a more complex pore structure within the full tested range.

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Keywords

synchrotron radiation / SAXS / nano-CT / pore size distribution / fractal / coal

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Yixin ZHAO, Chujian HAN, Yingfeng SUN, Nima Noraei DANESH, Tong LIU, Yirui GAO. Nano- to micro-pore characterization by synchrotron radiation SAXS and nano-CT for bituminous coals. Front. Earth Sci., 2021, 15(2): 189‒201 https://doi.org/10.1007/s11707-021-0889-6

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Acknowledgments

The research is financially sponsored by the National Natural Science Foundation of China (Grant Nos. U1910206, 51861145403, 51874312, 52004293), China Postdoctoral Science Foundation (No. 2018M641526), Yue Qi Distinguished Scholar Project of China University of Mining & Technology (Beijing), Fundamental Research Funds for the Central Universities, Fund of China Scholarship Council and the Open Project Program of Key Laboratory of Deep Earth Science and Engineering (Sichuan University), Ministry of Education (No. DESE 202004). Zhihong Li, Guang Mo and Wanxia Huang of Beijing Synchrotron Radiation Laboratory (BSRF) are thanked for providing the SAXS and Nano-CT experimental facilities and their suggestions in conducting experiments and data processing.

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