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Catalytic Removal of PM by Li-Co Delafossite Catalysts 被引量:2
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作者 王伟 ZHANG Jichen +1 位作者 肖静 LUO Dabing 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第2期433-435,共3页
By using solution combustion synthesis method, several Li-Co delafossite catalysts were prepared via a highly exothermic and self-sustaining reaction. The prepared catalysts were characterized by XRD, SEM and the cata... By using solution combustion synthesis method, several Li-Co delafossite catalysts were prepared via a highly exothermic and self-sustaining reaction. The prepared catalysts were characterized by XRD, SEM and the catalytic activities of the catalysts were evaluated by small sample experiment. It is shown that under loose contact conditions this catalyst can catalyze soot combustion at 360 ℃, and the best prepared catalyst Li Co0.9O2 can ignite soot combustion below 300 ℃. In the incompletely synthesized catalysts the Co cations shift to higher electrovalence, so the number of the surface adsorbed oxygen(O-) of the prepared delafossite catalysts increase and Li Co0.9O2 has the optimum catalytic activity. 展开更多
关键词 solution combustion synthesis delafossite catalysts particulate matter
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Crystallization and Luminescence Properties of Sm3+-Doped SrO-Al2O3-SiO2 Glass-Ceramics
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作者 李宏 LIU Liwang +3 位作者 TANG Xiaozhe WANG Qian Paul W Wang 王伟 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第5期1025-1031,共7页
The Sm^(3+)-doped SrO-Al2O3-SiO2(SAS) glass-ceramics with excellent luminescence properties were prepared by batch melting and heat treatment. The crystallization behavior and luminescent properties of the glass-... The Sm^(3+)-doped SrO-Al2O3-SiO2(SAS) glass-ceramics with excellent luminescence properties were prepared by batch melting and heat treatment. The crystallization behavior and luminescent properties of the glass-ceramics were investigated by DTA, XRD, SEM and luminescence spectroscopy. The results indicate that the crystal phase precipitated in this system is monocelsian(SrAl2Si2O) and with the increase of nucleation/crystallization temperature, the crystallite increases from 66 % to 79 %. The Sm(3+)-doped SAS glass-ceramics emit green, orange and red lights centered at 565, 605, 650 and 715 nm under the excitation of 475 nm blue light which can be assigned to the 4 G5/2→6 Hj/2(j=5, 7, 9, 11) transitions ofSm^(3+), respectively. Besides, by increasing the crystallization temperature or the concentration ofSm^(3+), the emission lights of the samples located at 565, 605 and 650 nm are intensified significantly. The present results demonstrate that theSm^(3+)-doped SAS glassceramics are promising luminescence materials for white LED devices by fine controlling and combining of these three green, orange and red lights in appropriate proportion. 展开更多
关键词 Sm3+-doped SrO-Al2O3-SiO2 glass-ceramic crystallization luminescence properties
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Influence of Heat Treatment Temperature on Microstructure and Bonding of TiO2 Film Coated on Diamond Particles Surface
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作者 刘小磐 KONG Weibing +4 位作者 XIAO Haiyan TANG Hao WAN Long HU Weida 王伟 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第5期1008-1012,共5页
TiO_2 films were coated on the surface of diamond particles using a sol-gel method. The effects of heat treatment temperature on the morphology, phase composition and chemical bond of diamond particles coated with TiO... TiO_2 films were coated on the surface of diamond particles using a sol-gel method. The effects of heat treatment temperature on the morphology, phase composition and chemical bond of diamond particles coated with TiO2 films were investigated through SEM, TEM, X-ray diffraction analysis, Raman spectroscopy, FTIR, and XPS. The results showed that when being heat-treated at 600 ℃, the amorphous TiO_2 film transfered to the anatase film which bonded well with diamond substrate. Meanwhile, the Ti-O-C bond formed between TiO2 film and diamond substrate. When being heat-treated at 800 ℃, TiO2 film was still anatase, and partial diamond began to graphitize. The graphitizated carbon could also form the Ti-O-C bond with TiO_2 film, although TiO_2 film would tend to crack in this case. 展开更多
关键词 diamond TiO2 film heat treatment temperature chemical bond
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