Naphthalene hydrogenation using Rh/Fe2O3-TiO2 magnetic catalysts

• Published in: Catalysis today 2021-01, Vol.360, p.176-184
• Main Authors: Cuauhtémoc-López, Ignacio, Jiménez-Vázquez, Adriana, Estudillo-Wong, Luis Alberto, Torres-Torres, Gilberto, Pérez-Vidal, Hermicenda, Barrera-Salgado, Miroslava, López-González, Rosendo, De la Cruz-Romero, Durvel
• Format: Article
• Language: English
• Subjects: Iron oxide; Magnetic materials; Naphthalene hydrogenation; Rh/Fe2O3-TiO2
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2019.11.001

[Display omitted] •Magnetics catalysts Fe2O3-TiO2 and Rh/ Fe2O3-TiO2 were synthesized.•The Rh/Fe2O3-TiO2 catalysts can be recovered with low magnetic fields and used until six successive reaction cycle.•Fe2O3-TiO2 give arise to great amount of decalins.•The Rh addition significantly improve the hydrogenating capacity of Fe2O3-TiO2, with probably naphthenic ring opening. Two magnetic catalysts were synthesized by a modification route and applied into the naphthalene hydrogenation at 553 K. For this propose, Fe2O3-TiO2 support and Rh/Fe2O3-TiO2 catalyst were characterized by X-ray diffraction (XRD), N2-physisorption, Vibrating Sample Magnetometer (VSM), Temperature Programmed Reduction of hydrogen (TPR), X-ray Photoelectron Spectroscopy (XPS) and High-Resolution Transmission Electron Microscopy (TEM) techniques. Based on the results, a multiple heterojunction was formed with a stick and spherical particles, where the morphology produced crystallite-size and pore-average size in the interval from 9 nm to 23 nm and 15 nm, respectively. The Rh/Fe2O3-TiO2 catalyst was selective in trans-decalin and increased its performance from 80 to 100% of conversion at 1 h. After six reactions cycles, this catalyst reached percentages conversion close to 85%. This phenomenon was promoted by 1) the presence of Rh and, 2) the adsorption of hydrogen in the surface of TiO2, which enabled Fe3+ sites and thus increasing the catalytic effect.