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Determination of trace element contents of Thymus species from Turkey
Thymus species trace elements minerals
2010/12/29
Eleven mineral and trace elements (Mg, Ca, K, Fe, Mn, Al, Zn, Cu, Cd, Ni, and Pb) were determined in the Thymus species growing in Turkey. The total concentrations were measured in samples mineralized...
HY沸石超笼“半三明治”环戊二烯铁物种的接枝(Grafting of “Half-sandwich” Cyclopentadiene Iron Species into HY Supercage)
HY沸石 Cp2Fe 接枝反应 半三明治 环戊二烯铁
2010/8/25
在真空条件下研究了Cp2Fe在HY沸石表面的接枝反应，并用原位FTIR、ICP、XRD、TPD-MS和UV-Vis DRS等方法对接枝产物的组成、结构及性质进行了表征。结果表明，在低于423 K的温度下，Cp2Fe可以强吸附在沸石的超笼内，并被氧化为Cp2Fe+阳离子；当在423 K长时间加热时，Cp2Fe+可与超笼表面的酸性中心发生化学反应，脱除一个环戊二烯基团，在沸石超笼形成“半三明治”环戊二...