Study of the structural and morphological properties of copper catalysts supported on Al2O3 and TiO2 synthesized by the impregnation method

Abstract

Aluminum oxide and titanium oxide are widely used as catalytic support. Due to their characteristics and properties, they have several applications such as chemical processes, photocatalysis and pollution control. In this work, the catalytic supports of Al 2 O 3 and TiO 2 were impregnated with 2% of copper oxide by the method of impregnation. The catalysts were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Brunauer-Emmett-Telle (BET) surface area and Infrared Spectroscopy techniques (FTIR). The results of XRD analysis presented the Cu/TiO 2 catalyst with high degree of crystallinity where the peaks corresponding to the phases anatase, rutile and CuO are easily found, while the Cu/Al 2 O 3 catalyst presented low degree of crystallinity. The samples morphology is in the form of agglomeration, the specific surface area was higher when copper metal was impregnated to the supports and the highest values was obtained with Cu/Al 2 O 3 catalyst. FTIR analysis allowed the visualization of the main vibrations of the functional groups presents in the catalysts samples. According to the results, it was observed that the incorporation of copper oxide did not affect significantly the crystalline structure of TiO 2 and Al 2 O 3 and that at the calcination temperature of 500°C it is possible to obtain a high specific surface area and a more active phase resulting in a good characterization which is suitable for various industrial applications.

CO Oxidation at Near-Ambient Temperatures over TiO2-Supported Pd-Cu Catalysts: Promoting Effect of Pd-Cu Nanointerface and TiO2 Morphology

“…This is an expected pattern and can be attributed to the pore filling by the added Cu 2+ and Pd 2+ which are incorporated and entrapped in the cavities of the support [ 9 , 12 ]. Similar decrease of BET surface area upon metal doping was reported by De Queiroz et al and Wang et al in their study of Cu/TiO 2 –Cu/Al 2 O 3 catalysts and Pd/Cu/MOx (MOx=TiO 2 and Al 2 O 3 ) catalysts, respectively [ 9 , 40 ]. Hossain et al also shows that both pore volume and surface area decreased upon incorporation of Cu in the titanium nanotube structure [ 29 ].…”

“…The N 2 adsorption/desorption isotherms for selected mono- and bi-metallic catalysts, namely Cu-TNW and Pd-Cu-TNW are presented in Figure 3 . Both catalysts show type IV isotherms and H3 hysteresis loop indicating mesoporous structure with pore width in the range of 2–50 nm according to IUPAC classification [ 33 , 40 ]. The hysteresis loop appearing in the multilayer range of physisorption isotherms is attributed to capillary condensation taking place in the mesopores [ 41 ].…”

Synthesis and Characterization of Structural Nanocomposite Titanium Dioxide Copper-Doped Using the Impregnation Method

“…The method depends on the metal cation, which becomes a dopant. Queiroz and Barbosa [17] reported that the synthesis of Cu-TiO2 by the impregnation method could be obtained by anatase phase TiO2. Behnajady and Eskandarloo [18] reported the same thing.…”