20、Q中加入Cg助剂后,催化剂表面Co/Si原子比由031增加到0.60,表明其表面的活性位增多.因此,加入CQ后催化剂的初活性和C$.选择性增加可能是由于以下两方面原因造成的:一是加入CeO?助剂后,分散于催化剂表面的Co增多,内扩散的影响降低;二是CeO2被部分还原成使催化剂的活性中心有所改变7m.S3Co/SIOi和CeOj-Co/SK...
采用射频等离子体技术制备新型Cu—Co/SiO催化剂.与直接焙烧制备的样品相比,射频等离子体处理 提高了催化剂的比表面积,显著增大了活性物种Co的表面含量,有效改进了催化剂的还原性能.以CO加氢合 成低碳混合醇为模型反应,在563K,5.0MPa,6000h一, H):V(CO)=I. ...
ZnO nanowire-based CO sensors prepared on patterned ZnO:Ga/SiO2/Si templates. Sens. Actuators B Chem. 2007, 125, 498-503.HSUEH T J, CHEN Y W, CHANG S J, WANG S F, HSU C L, LIN Y R, LIN T S, CHEN C C. ZnO nanowire-based CO sensors prepared on patterned ZnO:Ga/SiO2/Si ...
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验合成的PDMS/ SiO 纳米复合材料可以很好的保 2 [3] Wong C P,Zhu L,Hess D W,et al.Sol-gel process de- 护照片,避免其吸水受潮,从而长期收藏、保存。 有 rived superhydrophobic silica thin films for antistiction of 万方数据 望在纸质档案等方面得以应用。 MEMS devices[J].Mrs Proceedings,2007,...
R a re ea rth c om ple x c oa t ed sil ic a na nop ax t icl e 图1 Si0 2/Eu 配 合物核一壳 复合粒子 的形成 示意 图 F ig.1 Sc hema tic illust ra tion of rar e ear th com plex co ated on nano-S iO 2 to f or m cor e-shell nan opar ticles ...
Yan Qiao2,Yunjiang Yang2, Wenxian Li2 &Ying Liu2 The novel submicro-spheres SiO2@LaPO4:Eu@SiO2 with core-shell-shell structures were prepared by connecting the SiO2 submicro-spheres and the rare earth ions through an organosilane HOOCC6H4N(CONH(CH2)3Si(OCH2CH3)3 (MABA-Si)...
While a * transitions of c arbon66. It is worth mentioning that the loading of C-dots resulted in a change of the nanocomposite absorption from n(3e6w5l yn-mpr)epfoarredthCe -pdroetvsi-olouasdlye-dprCeopxaNrei1d−xCFeo2xON4i;1−xx =F e02.O9/4S;iOx =2/...
(FTIR)等测试手段对材料进行了表征,结果表明:SiO2一TiO2多孔复合材料中存在Ti—O~n、si一0一si和Ti一0一si3种化学 键。将制备的多孔复合材料进一步一sOH功能化(SiO一TiO2一SO3H),以水溶液中的碱性品红为目标污染物,考察了改性材 料对染料的吸附性能,结果显示,经一S0H功能化的材料具有较优的吸附性能,吸附率达...