M(II)-Al-Fe layered double hydroxides synthesized from aluminum saline slag wastes and catalytic performance on cyclooctene oxidation

Author(s)

Santamaria, L. ; Garcia, L. Oliveira ; De Faria, E. H. ; Ciuffi, K. J. ; Vicente, M. A. ; Korili, S. A. ; Gil, A.

• Document type: Journal article
• Source: MINERALS ENGINEERING; v. 180, p. 9-pg., 2022-04-01.

Abstract

Aluminum was extracted from saline slags via an alkaline method and employed in the synthesis of Layered Double Hydroxides (LDH) with various M2+ cations (Co, Mg, Ni and Zn), while Al and Fe were the M3+ cations, using the co-precipitation method and a M2+/M3+ 2:1 ratio. The structural characterization of the samples was performed with powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), nitrogen physisorption at 77 K, thermogravimetric analysis (TGA), temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). Their catalytic performance was tested for the oxidation of olefins (cyclooctene) and their biomimetic potential was analyzed. Results show a great selectivity towards epoxides with no other products obtained. Reaction yields followed the descending order Co4AlFe, Zn4AlFe, Ni4AlFe, and Mg4AlFe, the sample with cobalt as M2+ converting up to 85% of cyclooctene. (AU)

• FAPESP's process: 20/06712-6 - Ironporphyrins-titanium supported on clay or silica matrices for photocatalytic production of hydrogen peroxide
• Grantee: Katia Jorge Ciuffi Pires
• Support Opportunities: Regular Research Grants