Copper ion substituted hercynite (Cu0.03Fe0.97Al2O4): A highly active catalyst for liquid phase oxidation of cyclohexane

Synthesis and magnetic properties of nano-dimensional Fe1−xCuxAl2O4 (0.3 ≤ x ≤ 0.8)

“…Accordingly, Cu2p 3/2,1/2 core level peaks around 933.5 and 953.4 eV with corresponding satellite peaks and spin-orbit separation of 19.9 eV are assigned to Cu 2+ in these type of materials. 18,25,26 Satellite peaks are characteristics of oxidized transition metals especially, Fe, Co, Ni and Cu. 27 It has been well documented that an additional excitation of a second electron occurs during emission of a photoelectron of a core level creating a hole in it.…”

“…This drives us to replace part of the iron by copper keeping in mind the aspiration of catalytic use of Fe 1Àx Cu x Al 2 O 4 solid solution for oxidation catalysis. 18 It has been reported that the cubic normal spinel CuAl 2 O 4 can be synthesized at 800 C and at lower temperature the predominant formation of CuO takes place. 19,20 Thus, low temperature synthesis of CuAl 2 O 4 is again a challenging issue.…”

Characterisation of Particles Emitted during Laser Cutting of Various Metal Sheets and an Exposure Assessment for the Laser Operators

“…Both results from SEM-EDS and ICP-MS show that the PM also contained Cu. Substitution with Cu ions has earlier been found in this spinel phase [ 32 ]. Unfortunately, the Hercynite phase could not be confirmed with XRD as the diffractogram was indistinct.…”

Hercynite silica sulfuric acid: a novel inorganic sulfurous solid acid catalyst for one-pot cascade organic transformations

“…[22][23][24] In recent years, iron aluminate spinel hercynite (FeAl 2 O 4 ) has attracted interesting attention as a novel nanomagnetic catalytic support for the heterogenization of homogeneous catalytic species due to many advantages such as high adsorption capacities, large surface area, low cost, heterogeneous nature, paramagnetic nature and excellent physicochemical stability. [25][26][27][28][29][30][31] Recently, we have converted this ferro-spinel nanomaterial into a variety of supported active catalytic materials. [32][33][34] In this context, the present study represents that Zol-gol's SSA catalyst can be efficiently magnetized by being immobilized on the surface of nanomagnetic hercynite.…”