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29 results on '"Wei, Zhehao"'

10. Nanocomposite polymer electrolyte for rechargeable magnesium batteries

Author

Shao, Yuyan, Rajput, Nav Nidhi, Hu, Jianzhi, Hu, Mary, Liu, Tianbiao, Wei, Zhehao, Gu, Meng, Deng, Xuchu, Xu, Suochang, Han, Kee Sung, Wang, Jiulin, Nie, Zimin, Li, Guosheng, Zavadil, Kevin R., Xiao, Jie, Wang, Chongmin, Henderson, Wesley A., Zhang, Ji-Guang, Wang, Yong, Mueller, Karl T., Persson, Kristin, and Liu, Jun

Published
2015
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19. Effect of chlorine dioxide with NaH2PO4 and DMSO on bleaching of kraft pine pulp.

Author

Huang, Lijie, Wei, Zhehao, Wang, Yanan, Han, Xiaoxue, Chen, Haobin, Huang, Chongxing, and Wei, Yingnan

Subjects
*CHLORINE dioxide, *SULFATE pulping process, *WOOD pulp bleaching, *DIMETHYL sulfoxide, *SCANNING electron microscopes, *LIGNIN structure, *SODIUM phosphates
Abstract

In this paper, the effect of D0 temperature, Kappa factor and the final pH value on bleaching sulfate bleached pine wood pulp was studied. The results showed that the bleaching efficiency was better when the pH value was 4, and the amount of absorbable organic halogen (AOX) in the bleaching wastewater was decreased. The Kappa factor is linear with the whiteness in the range of 0–0.15. With the increase of the Kappa factor, the amount of AOX in bleaching wastewater of D0 and Ep gradually increases. High temperature bleaching can reduce AOX production, but some fibers are hydrolyzed, leading to a decrease in pulp viscosity. The effects of chlorine dioxide solution adding sodium dihydrogen phosphate (NaH2PO4) and dimethylsulfoxide (DMSO) on pulp bleaching were investigated. The results showed that both solutions could reduce the amount of AOX in bleaching wastewater. Among them, the addition of NaH2PO4 in chlorine dioxide increased pulp whiteness, while the addition of DMSO was the opposite. Scanning electron microscope showed that a small amount of hollow cracks and more voids appeared on the surface of pulp fibers after the addition of NaH2PO4. Pulp fibers bleached by the chlorine dioxide adding DMSO have more folds and less voids on the surface. The surface wrinkles of pulp fibers increased with the addition of DMSO and the voids were less. FT-IR showed that the number of chromophore groups in the pulp bleached by chlorine dioxide adding NaH2PO4 were decreased. However, the lignin characteristic absorption peak in the pulp bleached by chlorine dioxide adding DMSO increased at the intensity of 1062 and 1160 cm−1, which indicated that there were more residual chromophore groups. [ABSTRACT FROM AUTHOR]

Published
2021
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20. Sustained Low Temperature NOx Reduction

Author

Zha, Yuhui, primary, Cunningham, Michael, additional, Tang, Yadan, additional, Srinivasan, Anand, additional, Luo, Jinyong, additional, Heichelbech, John, additional, Lakkireddy, Venkata, additional, Yezerets, Aleksey, additional, Ruffin, Sade, additional, Wei, Zhehao, additional, Fedeyko, Joseph, additional, Sukumar, Balaji, additional, Hess, Howard, additional, Gao, Feng, additional, Szanyi, Janos, additional, and wang, Yong, additional

Published
2018
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28. Effects of CeO2 support facets on VOx/CeO2 catalysts in oxidative dehydrogenation of methanol.

Author

Li, Yan, Wei, Zhehao, Gao, Feng, Kovarik, Libor, Peden, Charles H.F., and Wang, Yong

Subjects
*CERIUM oxides, *VANADIUM oxide, *VANADIUM catalysts, *DEHYDROGENATION, *OXIDATION of methanol
Abstract

Highlights: [•] VOx/CeO2 catalysts with well-defined CeO2 facets are highly desirable as promising model catalysts. [•] Morphology and exposed facets of CeO2 supports affect the activity of oxidative dehydrogenation of methanol. [•] VOx preferentially occupy the CeO2 (100) facets, followed by the (110) and (111) facets. [•] VOx active centers on (110) facets exhibit highest activity, likely related to their high oxygen defect density. [ABSTRACT FROM AUTHOR]

Published
2014
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29. Effect of Sodium on the Catalytic Properties of VOx/CeO2Catalysts for Oxidative Dehydrogenation of Methanol

Author

Li, Yan, Wei, Zhehao, Sun, Junming, Gao, Feng, Peden, Charles H. F., and Wang, Yong

Abstract

A series of VOx/CeO2catalysts with various sodium loadings (Na/V ratio from 0 to 1) have been studied for oxidative dehydrogenation (ODH) of methanol. The effect of sodium on the surface structure, redox properties, and surface acidity/basicity of VOx/CeO2was investigated using hydrogen temperature-programmed reduction (H2-TPR), Raman spectroscopy, and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The experimental results indicate that the effect of sodium on VOx/CeO2is highly dependent on the Na/V ratio. At a low Na/V ratio (Na/V < 0.25), sodium addition only slightly decreases the redox ability of VOx/CeO2and has little effect on its activity and selectivity to formaldehyde, even though the Brönsted acidity is almost completely eliminated at a Na/V ratio of 0.25. At a high Na/V ratio (Na/V > 0.25), sodium addition greatly alters the nature of the active sites by V–O–Ce bond cleavage and V–O–Na bond formation, leading to significantly reduced activity of the VOx/CeO2catalysts. At Na/V > 0.25, the selectivity to formaldehyde also decreases with increasing Na/V ratio due to (1) the suppressed reducibility of VOxand (2) increased basicity leading to increased CO2.

Published
2013
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