Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3 Catalysts for CO Oxidation

Abstract

Conventional supported Pt catalysts have often been prepared by loading Pt onto commercial supports, such as SiO2, TiO2, Al2O3, and carbon. These catalysts usually have simple metal-support (i.e., Pt-SiO2) interfaces. To tune the catalytic performance of supported Pt catalysts, it is desirable to modify the metal-support interfaces by incorporating an oxide additive into the catalyst formula. Here we prepared three series of metal oxide-modified Pt catalysts (i.e., Pt/MOx/SiO2, Pt/MOx/TiO2, and Pt/MOx/Al2O3, where M = Al, Fe, Co, Cu, Zn, Ba, La) for CO oxidation. Among them, Pt/CoOx/SiO2, Pt/CoOx/TiO2, and Pt/CoOx/Al2O3 showed the highest catalytic activities. Relevant samples were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), H2 temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), CO temperature-programmed desorption (CO-TPD), O2 temperature-programmed desorption (O2-TPD), and CO2 temperature-programmed desorption (CO2-TPD).

Co-Supported CeO2Nanoparticles for CO Catalytic Oxidation: Effects of Different Synthesis Methods on Catalytic Performance

“…Furthermore, Co/CeO 2 catalysts show more chemically adsorbed oxygen species and lower desorption temperatures than pure CeO 2 supports. Except for Co/CeO 2 -c, two oxygen desorption peaks can be observed for the Co/CeO 2 catalysts, while Co/CeO 2 -c shows only one peak near 750 • C. For Co/CeO 2 -p and Co/CeO 2 -h, the other wide peak α appears in the range of 150 to 680 • C. Generally, the peak β centered below 750 • C can be attributed to the oxygen desorption from Co and CeO 2 sites, and the high-temperature peak at T > 750 • C corresponds to the thermal decomposition of Co 3 O 4 , which is consistent with previous reports [44][45][46]. The peak at T < 750 • C corresponds to the amount of oxygen desorption that has been listed in Table 1.…”

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

“…The crystalline structure of the calcined support and of all the catalysts is reported in Figure 1. The broad peaks originated from about 2ϴ = 15° to 35° are the reflections ascribable to amorphous silica framework [34]. In addition, the XRD data of all the samples display the presence of characteristic lines of ceria cubic phase [35] (at 2ϴ = 28.5°, 33.0°, 47.4°, and 56.3°).…”

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

“…The X-ray diffraction patterns of the calcined catalysts are reported in Figure 1. All samples show a broad peak in the 2θ region of 20-30 • , attributed to the amorphous silica [39]. In addition, they clearly display the diffraction peaks corresponding to CeO 2 , that well match with the peaks of the fluorite cubic phase [40].…”