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305 results on '"Wang, Fumei"'

14. Preparation and oil adsorption performance of cattail fiber wadding

Author

GUAN Fuwang, YANG Zhuli, SHENG Kai, WANG Fumei, and QIU Yiping

Subjects
cattail fiber, composite flocs, oil adsorption, structural properties, oil-water separation, Materials of engineering and construction. Mechanics of materials, TA401-492, Environmental engineering, TA170-171
Abstract

To study the adsorption to pure oil and oil-water mixture, cattail fiber waddings with different fibers, wadding structures, blending ratios were prepared. Oil absorbencies in the pure oils and oil-water mixtures were tested and evaluated. The analysis showed that cattail fiber waddings have better adsorption performance to pure oil and oil-water mixture, which is higher than 20 g/g. The retention rate of pure oil is higher than 90%, while retention rate of oil-water mixture decreases to 68%. With the increase of wadding thickness and cattail ratio, the oil adsorption and retention of composite waddings are heightened. The oil-retention declines with the blending of polypropylene (PP) fiber. The oil adsorption of kapok fiber is better than that of cattail fiber and PP fiber. Therefore, oil adsorption performance is improved through adjusting the fiber ratio and porous structure.

Published
2022
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28. Comparison of test results between double whisker length measurement method and hand row method.

Author

SUN Jiahui, MA Jingtao, SU Jian, ZHONG Yueqi, SHEN Hua, and WANG Fumei

Subjects
LENGTH measurement, WHISKERS, TEST systems, STATISTICAL correlation, TEST methods
Abstract

A version 2.0Z testing system using the double whisker photoelectric method was developed. Twenty-five kinds of carding cashmere samples were tested by double whisker photoelectric method. The accuracy and stability of the 2.0Z test system were verified by comparing the test results of the hand row method in GB 18267-2013. The results show that there are differences among samples and the sample size of hand-row method is small, so the random error is high, while the results of the double whisker photoelectric method are relatively stable. The double whisker photoelectric method 2.0Z test system has a high consistency with the hand row method. In particular, the average deviation of the mean length index is less than 2 mm, and the correlation coefficient is greater than 0.8. The double whisker photoelectric method 2.0Z test system has a high accuracy. [ABSTRACT FROM AUTHOR]

Published
2024
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34. Insights into Migration and Transformation of Cu Species during SO2Poisoning and Hydrothermal Aging of Cu/SAPO-34 NH3–SCR Catalysts

Author

Wang, Fumei, Cai, Qi, He, Xinhua, Shen, Boxiong, Negahdar, Leila, Feng, Shuo, and Beale, Andrew M.

Abstract

Cu/SAPO-34 catalysts have been widely used for the reduction of NOx from diesel exhaust by ammonia-selective catalytic reduction (SCR). Sulfur poisoning remains a challenge for Cu/SAPO-34 catalysts in NH3–SCR, restricting its application. In this study, Cu/SAPO-34 samples containing a mixture of Cu species comprising isolated Cu2+located in the 6MR, Cu(OH)+in 8MR, CuO clusters/nanoparticles, and Cu+species were prepared. The Cu speciation during SO2and hydrothermal aging of Cu/SAPO-34 SCR catalysts was subsequently studied. While hydrothermal aging had little effect on catalytic activity, the sulfur-aged sample exhibited deterioration in NH3–SCR activity over the temperature range of 100–575 °C. The breakage and collapse of the zeotype framework and chemical deactivation of the Cu/SAPO-34 catalyst after exposure to SO2and H2O took place. A combination of X-ray photoelectron spectroscopy (XPS) and TGA-DT-DSC revealed the presence of ammonium bisulfate, copper bisulfate/sulfate, aluminum sulfate, and sulfuric acid after SO2and H2O copoisoning under SCR conditions. Furthermore, Cu(OH)+tended to migrate to form isolated Cu2+and Cu+, as well as agglomerate to form CuO particles. Density functional theory (DFT) calculations revealed that SO2and O2could readily be absorbed by CuO particles to form stable copper bisulfate/sulfate species with the following order of preference: CuO > Cu+> Cu2+> Cu(OH)+. In contrast, Cu(OH)+was less prone to be poisoned by easily releasing SO3than other Cu species sites.

Published
2024
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