Synthesis of TiO2 with diverse morphologies as supports of manganese catalysts for CO oxidation

Abstract

The catalytic CO oxidation reaction has been investigated over a series of Mn/TiO 2 catalysts. The titanium dioxides, including several mesoporous structures were prepared by different synthesis procedures. The mesoporous TiO 2 synthesized using evaporation-induced self-assembly (EISA) method exhibited the highest surface area (217.14 m 2 /g). The successful loading of the active manganese component (2 %) to TiO 2 supports showed high dispersion of MnO x species in amorphous state. Characterizations of XRD, N 2 adsorption-desorption, pore size distributions, TEM, H 2 -TPR and XPS were applied to contrast their structure properties and correlated with the corresponding catalytic performance. The Mn/EISA exhibited the highest catalytic activity among the series of Mn/TiO 2 catalysts, which could completely oxidize CO into CO 2 at temperature as low as 270 o C, due to its highly ordered mesoporous channels, which effectively enlarge the surface area leading to promoting a strong interaction between MnO x species (68 % Mn 3?) and TiO 2 support.

Electrospun silk nanofiber loaded with Ag-doped TiO2with high-reactive facet as multifunctional air filter

“…All catalysts exhibits the diffraction peaks at 2 θ of 25.4°, 37.8°, 48.1°, 54.0°, 55.1° and 62.8° which belong to the (101), (004), (200), (105), (211), and (204) lattice planes of anatase phase TiO 2 (JCPDS 21-1272), respectively. 33 At the low content of Ag (0.1 and 1 wt%), the peaks corresponding to metallic Ag are not detected, possibly due to the Ag doping contents in these two samples are lower than the detection limit of the XRD machine. On the other hand, when Ag content is increased to 10 wt% (10%Ag-TiO 2 ), the corresponding diffraction peaks of Ag with face-center cubic (fcc) lattice at 2 θ of 38.1°, 44.3°, and 64.5°, 34 are evidently observed.…”

Adsorption and conversion of small gases on TiO2 nanoparticles and surfaces of modified TiO2

“…Furthermore, the Mn-TiO 2 catalyst was also prepared by many techniques such as hydrothermal treatment [164], solvothermal synthesis [165] and sol-gel method [166]. A series of Mn/TiO 2 catalysts were prepared and investigated for the catalytic CO oxidation reaction and found to exhibit the best catalytic activity for CO oxidation [167]. In the present work, the CO oxidation with O 2 on Mn-TiO 2 to yield CO 2 has, therefore, been investigated using periodic DFT method.…”