In this study, various Cu-based spinel compounds, i.e., CuFe 2O4, CuMn2O4, CuAl2O 4 and CuLa2O4, were fabricated by a solid-state reaction method. Reduction behaviors and morphological changes of these materials have been characterized by H2 temperature-programmed reduction (H2-TPR), X-ray diffraction (XRD), Scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Moreover, the catalytic properties for steam reforming of methanol (SRM) of these Cu-based spinel compounds were investigated. H2-TPR results indicated that the reducibility of Cu-based spinel compounds was strongly dependent on the B-site component while the CuFe2O4 catalyst revealed the lowest reduction temperature (190 C), followed respectively by CuAl2O 4 (267 C), CuMn2O4 (270 C), and CuLa 2O4 (326 C). The reduced CuAl2O4 catalyst demonstrated the best performance in terms of catalytic activity. Based on the SEM and XRD results, pulverization of the CuAl2O4 particles due to gas evolution and a high concentration of nanosized Cu particles (≈50.9 nm) precipitated on the surfaces of the Al2O 3 support were observed after reduction at 360 C in H2. The BET surface area of the CuAl2O4 catalyst escalated from 5.5 to 13.2 m2/g. Reduction of Cu-based spinel ferrites appear to be a potential synthesis route for preparing a catalyst with high catalytic activity and thermal stability. The catalytic performance of these copper-oxide composites was superior to those of conventional copper catalysts.
ASJC Scopus subject areas
- Ceramics and Composites
- Process Chemistry and Technology
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Materials Chemistry