Abstract：The Pt-TiO2 nanocomposites were fabricated from Pt nanoparticles and TiO2 nanoparticles with the same surface charges via supergravity technology. The elemental analysis results revealed that the loading percentage of Pt (0.83%) on TiO2 via supergravity technology was higher than that via natural adsorption (0.13%). The catalytic hydrogenation activitie (0.79 s-1) over the nanocomposites prepared with supergravity technology were higher than that with regular method (0.48 s-1), revealing the stronger metal-support interaction between Pt and TiO2 via supergravity condition than that via regular method. Meanwhile, the nanocomposites prepared with supergravity technology had higher catalytic stability than that prepared with regular method. When the turnover number reached 40000, the conversion of nitrobenzene can remain up to 96%, which is higher than that on the catalyst prepared with regular method (92%).
[1] Kacar R，Mucur S P，Yildiz F. et al. Solution processed ternary blend nano-composite charge regulation layer to enhance inverted OLED performances. Applied Physics Letters，2018，112(16),163302.[2] Szczepanik B. Photocatalytic degradation of organic contaminants over clay-TiO2 nanocomposites: A review. Applied Clay Science, 2017，141，227-239.[3] Doluda V Y, Tereshchenkov A Yu. et al. Catalytic nitrobenzene hydrogenation in supercritical carbon dioxide. Russian Journal of Physical Chemistry B,2015, 8(7): 958-962.[4] 于婷婷,安宏乐.浸渍法制备La-Al-SBA-15介孔分子筛及其催化合成棕榈酸甲酯[J].天津化工,2018,32(05):18-22.[5] Wang J, Yuan C K. et al. Effect of the nanostructure and the surface composition of bimetallic Ni-Ru nanoparticles on the performance of CO methanation. Applied Surface Science, 2018, 441:816-823.[6] Vichaphund S, Aht-ong D. et al. Production of aromatic compounds from catalytic fast pyrolysis of Jatropha residues using metal/HZSM-5 prepared by ion-exchange and impregnation methods. Renewable Energy, 2015, 79: 28-37.[7] 曾东,李振虎.超重力技术的应用研究[J].石油化工,2018,47(07):763-768.[8]孙继良.超重力技术的应用与研究进展[J].炼油与化工,2012,23(06):14-15+57-58.[9] Vargas M, M E Rincon, and E Ramos. Formation and Characterization of TiO2/CNT Nanomaterials Dried under Supergravity Conditions. Journal of Nanomaterials, 2017[10] 官益豪,黄卫星,肖泽仪,周进.超重力技术及其应用研究进展[J].化工机械,2005(01):55-59.[11] 赵祥迪,孙万付,徐银谋,郭建章.超重力技术在危化品气体处理中的应用[J].安全、健康和环境,2016,16(07):1-4.[12] Li Xin, Yue Wang. et al. Deficient copper decorated platinum nanoparticles for selective hydrogenation of chloronitrobenzene. Journal of Materials Chemistry A, 2017, 5(22):11294-11300.
2019, Vol. 26 