The series of spinels Co3−sAlsO4 (0 < s < 2): Study of Co2AlO4

In situ synchrotron diffraction study of charge–discharge mechanism of sol–gel synthesized LiM0.5Mn1.5O4 (M=Fe, Co)

“…The metalemetal and metal-oxide bond distances are related to the unit cell and the u parameter of the oxygen ions. Any changes in the u parameter also reflect the adjustment of the structure to accommodate differences in the relative cation radii in the octahedral and tetrahedral sites [17]. The X parameter describes a tanq dependence of the half width with Lorentzian profile shape and results mainly from residual strain 3 ¼ Dd/d.…”

Cobalt hydrotalcites as catalysts for bioethanol steam reforming. The promoting effect of potassium on catalyst activity and long-term stability

“…From the information compiled in Fig. 1 it is deduced that the main peaks of the diffractograms can be indexed to MgAl 2 O 4 and/or Co 2 AlO 4 spinels [13,14] (XRD patterns JCPDS 01-075-1798 and JCPDS 00-038-0814, respectively). In addition, the two shoulders at 43 • and 63 • of 2Â match the main peaks of the rock salt type phase common to MgO and CoO [15,16] (XRD patterns JCPDS 01-07-1525 and JCPDS 01-075-0533, respectively), suggesting the incipient formation of the simple oxides or the double oxide.…”

Enhancing cobalt dispersion in supported Fischer-Tropsch catalysts via controlled decomposition of cobalt precursors

“…It is known that trivalent cobalt and aluminum have rather similar Pauling's ionic radii (0.063 nm for Co 3+ and 0.054 nm for Al 3+ ). Co 3+ of Co 3 O 4 can be gradually replaced [28] by Al 3+ to produce the series of Co 3−s Al s O 4 (0 < s < 2) spinels. These series include [29,30] Figure 5 shows the temperature-programmed reduction profiles obtained for a series of cobalt alumina supported catalysts which were calcined at different temperatures.…”