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Your search keyword '"Huang, Xin‐Song"' showing total 14 results
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14 results on '"Huang, Xin‐Song"'

13. Morphology effects of nanoscale ceria on the activity of Au/CeO2 catalysts for low-temperature CO oxidation

Author

Huang, Xin-Song, Sun, Hao, Wang, Lu-Cun, Liu, Yong-Mei, Fan, Kang-Nian, and Cao, Yong

Subjects
*METAL catalysts, *COLLOIDAL gold, *CERIUM oxides, *CARBON monoxide, *OXIDATION, *CHEMICAL kinetics, *CATALYST supports, *NANOSTRUCTURES, *X-ray diffraction, *TRANSMISSION electron microscopy, *X-ray photoelectron spectroscopy
Abstract

Abstract: Catalytic properties of Au nanoclusters deposited on a one-dimensional CeO2 (1-D) nanorod and CeO2-nanoparticles have been investigated during CO oxidation at ambient temperatures. The kinetic data showed that the activity of Au catalysts could be remarkably improved by using CeO2-nanorods as support compared to the CeO2-nanoparticles. The measured specific rate and apparent activation energy (E a) at 278K were 4.02molCO gAu −1 h−1 and 15.9kJmol−1, respectively, for the Au/CeO2-nanorods (Au-CR) catalyst, while those for the Au/CeO2-nanoparticles (Au-CP) catalyst were 0.15molCO gAu −1 h−1 and 28.4kJmol−1, respectively. Characterization by X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), diffuse reflectance UV–Vis spectroscopy (DR UV–Vis) and in situ diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS) of CO adsorption reveal that the predominantly exposed {100}/{110}-dominated surface structures of ceria nanorods show great superiority for anchoring and dispersing of gold nanoclusters, which in turn leads to a higher reducibility and activity of the Au-CeO2 surface for CO oxidation. It is also confirmed that, arising from the strong metal–support interaction (SMSI), the presence of gold nanoclusters has a strong influence on the electronic state of the CeO2 substrates. [Copyright &y& Elsevier]

Published
2009
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14. Synthesis, photoluminescence and photocatalytic performance of BiPO4with different phase structures

Author

Wang, Yun-jian, Li, Li-ping, Zheng, Jing, Huang, Xin-song, and Li, Guang-she

Abstract

Three kinds of crystal phase BiPO4(HP, LTBP, and HTBP) were selectively synthesized by controlling the preparation conditions. Structures of the three samples are all constructed by PO4and BiO8polyhedra but with different geometric structures. Detailed characterization was carried out by X-ray diffraction(XRD), scanning eletron microscopy(SEM) and Raman, UV-Vis, and luminescence spectrometries. Three samples exhibit huge distinctions in their photoluminescence(PL) lifetime: 0.68, 162 and 160 μs for HP, LTBP, and HTBP, respectively. More interesting, an outstanding photocatalytic activity is observed for as-prepared LTBP nanorod, which shows even higher activity for the degradation of MB solution than P25. In addition, experiments were carried out to clarify the role of hydroxyl (·OH) and superoxide radicals(O2·) played in photocatalytic process and it was found O2·was the main active species in BiPO4photocatalysts. Further comparison of structural and photocatalytic properties of the three samples finds that structure distortion is contributed to their property difference. A correlation was found between photocatalytic performance and the distortion of BiO8dodecahedra. The internal field generated by the distortion of BiO8dodecahedra was believed advantageous for the separation of electron and hole, which was in favor of the improvement of photocatalytic activity. This correlation may help to design other photocatalysts with high activity.

Published
2013
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