当前位置: X-MOL 学术J. Iran. Chem. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Rare earth Ce- and Nd-doped spinel nickel ferrites as effective heterogeneous catalysts in the (ep)oxidation of alkenes
Journal of the Iranian Chemical Society ( IF 2.4 ) Pub Date : 2020-07-05 , DOI: 10.1007/s13738-020-01983-2
Mohamed Shaker S. Adam , Aly M. Hafez , Mai M. Khalaf

Cerium (Ce)- and neodymium (Nd)-doped spinel nickel ferrites catalysts system were synthesized using a cost-effective sol–gel route. The as-prepared nickel ferrites and its doped Ce and Nd nanomaterials were characterized in terms of Fourier transform infrared spectrophotometry, X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, selected area diffraction pattern, zeta potential and magnetism techniques. Their catalytic potential was examined in the (ep)oxidation of 1,2-cyclooctene by using hydrogen peroxide (H2O2) or tert-butylhydroperoxide (t-BuOOH). Optimization of various parameters, including solvent, oxidant and catalyst type revealed that chloroform (CHCl3) or 1,2-dichloroethane as a solvent and t-BuOOH as an oxidant were found to be the best choice for this catalytic system. The catalytic efficiency was found as Nd–NiFe2O4 > Ce–NiFe2O4 > NiFe2O4. Further, the applied nanocatalysts could be easily renovated and exhibited high catalytic reactivity for 5 times of recycling experiments with long-time durability. A reasonable discussion of the mechanism reaction reinforced the action of these spinel catalysts.



中文翻译:

稀土铈和钕掺杂的尖晶石镍铁氧体是烯烃(环氧)氧化中有效的多相催化剂

铈(Ce)和钕(Nd)掺杂的尖晶石镍铁氧体催化剂体系是使用经济高效的溶胶-凝胶法合成的。制备的镍铁氧体及其掺杂的Ce和Nd纳米材料通过傅里叶变换红外分光光度法,X射线衍射,场发射扫描电子显微镜,能量色散X射线光谱,透射电子显微镜,选择区域衍射图谱进行了表征。 ,ζ电位和磁性技术。通过使用过氧化氢(H 2 O 2)或叔丁基氢过氧化物(t-BuOOH)。优化各种参数(包括溶剂,氧化剂和催化剂类型)后,发现氯仿(CHCl 3)或1,2-二氯乙烷作为溶剂,t- BuOOH作为氧化剂是该催化系统的最佳选择。发现催化效率为Nd–NiFe 2 O 4  > Ce–NiFe 2 O 4  > NiFe 2 O 4。此外,所应用的纳米催化剂可以容易地进行翻新,并且具有5次循环实验的高催化活性,并具有长期的耐久性。对机理反应的合理讨论加强了这些尖晶石催化剂的作用。

更新日期:2020-07-05
down
wechat
bug