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Prepartion, Characterization and Properties of Major Phases Mullite Composite Nanocrystals
Wang Yinye,Ma Zhi,Qin Yongning
Author NameAffiliationE-mail
Wang Yinye Tianjin Urban Construction College, Tianjin 300072 Institute of Chemical Engineering ,Tianjin University, Tianjin 300072 wangyinye@263.net 
Ma Zhi Institute of Chemical Engineering ,Tianjin University, Tianjin 300072  
Qin Yongning Institute of Chemical Engineering ,Tianjin University, Tianjin 300072  
Abstract:
Major phases mullites prepared by hydrothermal crystallization method with kaolinite as raw material, were composite nanocrystals. The matter phases, grain size and thermal stability of composite nanocrystals made in different condition were characterized by XRD, TEM, BET and TG-DTA. Major phases nanocrystals were studied in Temperature Programmed Desorption of CO, SO2, and supported Ni, Co, and Mn were measured in Temperature Programmed Reduction(TPR). The CO2 and solid sulfur were found in adsorption preduts. It was showed that adsorbates have changed on the surface of the nanocrystals. Due to different particle sizes of micro-metre scales crystals and nanocrystals of the supported Ni, Co and Mn, peak temperature and area differed along with the different interaction between supported oxides and the support. It was showed that there was structural effect between the supported oxides of Ni, Co, Mn and the supporter. Moreover, structural difference in the surface of crystals led to different comsumption of H2.
Key words:  Composite nanocrystals, Mullite, Thermal stability, Hydrothermal crystallization method
FundProject:
主晶相为莫来石复合纳米晶的制备、结构表征及性能测试
王银叶*,马智,秦永宁
摘要:
以高岭土为原料,采用水热晶化法,制得了主晶相为莫来石的复合纳米晶。利用XRD、TEM、BET及TG~TDA对在不同条件下制得的纳米晶物相、粒度及热稳定性进行了表征。对复合纳米晶进行了CO、SO2程序升温脱附性能测试。对负载Ni、Mn、Co进行程序升温还原测试。结果表明:在脱附物中检测出CO2与固体硫,证明吸附质在纳米晶表面发生了反应。微米晶与纳米晶负载Ni、Co、Mn后,随着粒度的不同,负载上的氧化物与载体的相互作用力不同,而表现出不同的峰温与峰面积,表明负载上Ni、Co、Mn的氧化物与载体有结构效应,且随晶体表面结构的不同,而表现出不同的H2消耗量。
关键词:  复合纳米晶  莫来石  热稳定性  水热晶化法
DOI:10.1088/1674-0068/14/2/216-222
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