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Your search keyword '"Hao, Shixiong"' showing total 10 results
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10 results on '"Hao, Shixiong"'

7. Fractal dimension of coal particles and their CH4 adsorption

Author

Wang Chengyang, Chu Wei, Sun Wen-jing, and Hao Shixiong

Subjects
lcsh:TN1-997, business.industry, Chemistry, Energy Engineering and Power Technology, Thermodynamics, Geotechnical Engineering and Engineering Geology, Fractal dimension, Volumetric measurement, Fractal analysis, Fractal, Adsorption, Volume (thermodynamics), Geochemistry and Petrology, Coal, Sorption isotherm, business, lcsh:Mining engineering. Metallurgy
Abstract

We describe the fractal analysis of three differently sized coal samples (0.350–0.833 mm, 0.245–0.350 mm, and 0.198–0.245 mm). The influence of fractal dimension on CH4 adsorption capacity is investigated. The physical parameters of the samples were determined via the Brunauer–Emmett–Teller (BET) theory. A CH4 adsorption study over the pressures range from 0 to 5 MPa was carried out with a new volumetric measurement system. The CH4 adsorption was measured using the differently sized coal. Two fractal dimensions, D1 and D2 were determined over the pressure ranges from 0 to 0.5 MPa and from 0.5 to 1 MPa, using the Frenkel-Halsey-Hill (FHH) method. We conclude that the two fractal dimensions correlate with the CH4 adsorption capacity of the coal: increasing CH4 adsorption capacity occurs with a corresponding increase in fractal dimension. Furthermore, D1 and D2 are positively correlated with surface area, pore volume, and samples size. The size distribution of the samples has fractal characteristics. Keywords: Coal, Fractal dimension, Frenkel-Halsey-Hill, Brunauer–Emmett–Teller, Adsorption isotherm

Published
2012
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10. Preparation of LaXCoO3(X = Mg, Ca, Sr, Ce) catalysts and their performance for steam reforming of ethanol to hydrogen

Author

Ma, Fei, Ding, Zhenwu, Chu, Wei, Hao, Shixiong, and Qi, Tao

Abstract

Perovskite nanocomposite catalysts LaXCoO3(X = Mg, Ca, Sr, or Ce; n(La):n(X) = 3:2) have been prepared by a citric acid-complexing method and used for steam reforming of ethanol (SRE), leading to hydrogen generation. The samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, N2adsorption-desorption, and H2temperature-programmed reduction. The effects of elemental substitution in the LaCoO3perovskite were studied, and the catalytic performance and primary stability of the hydrogen production from SRE were investigated. In the highly substituted samples, only the Ce-doped sample was isolated as the pure perovskite phase. The presence of a Co3O4phase in the Ca-doped or Sr-doped samples was beneficial for the reduction of the active Co component, while Sr-doped or Ce-doped samples showed good activity and stability. The sample incorporating Sr demonstrated better catalytic performance than those of other samples.

Published
2014
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