Abstract
Pt/CeO2 catalysts with nanoporous structures were prepared by the facile dealloying of melt-spun Al92−XCe8PtX (X = 0.1; 0.3 and 0.5) ribbons followed by calcination. The phase compositions and structural parameters of the catalysts were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). The specific surface area and pore size distribution were characterized by N2 adsorption–desorption tests. The catalytic properties were evaluated by a three-way catalyst (TWC) measurement system. The results revealed that the dealloyed samples exhibited a nanorod framework structure. The Pt nanoparticles that formed in situ were supported and highly dispersed on the CeO2 nanorod surface and had sizes in the range of 2–5 nm. For the catalyst prepared from the melt-spun Al91.7Ce8Pt0.3 ribbons, the 50% CO conversion temperature (T50) was 91 °C, and total CO could be converted when the temperature was increased to 113 °C. An X-ray photoelectron spectroscopy (XPS) test showed that the Pt0.3/CeO2 sample had a slightly richer oxygen vacancy; and a H2 temperature-programmed reduction (H2-TPR) test demonstrated its superior adsorption ability for reduction gas and high content of active oxygen species. The experiments indicated that the catalytic performance could be retained without any attenuation after 130 h when water and CO2 were present in the reaction gas. The favorable catalytic activities were attributed to the high specific areas and small pore and Pt particle sizes as well as the strong interactions between the CeO2 and Pt nanoparticles. The Pt nanoparticles were embedded in the surface of the CeO2 nanorods, inhibiting growth. Therefore, the catalytic stability and water resistance were excellent.
Highlights
The efficient catalytic oxidation of carbon monoxide is a very significant topic because of its widespread applications in CO gas sensors, indoor air purification, and industrial fields, including pollution control devices and automotive exhaust treatment [1,2]
Noble metals dispersed on specific metal oxides with high storage/release oxygen capacities are highly active towards catalytic CO oxidation
Our team has performed research on CeO2, NiO/CeO2 and Ag/CeO2 nanorod frameworks synthesized by dealloying methods, which showed superior catalytic activity for CO oxidation due to their high porosities and large specific surface areas [30,31,32]
Summary
The efficient catalytic oxidation of carbon monoxide is a very significant topic because of its widespread applications in CO gas sensors, indoor air purification, and industrial fields, including pollution control devices and automotive exhaust treatment [1,2]. Noble metals dispersed on specific metal oxides with high storage/release oxygen capacities are highly active towards catalytic CO oxidation. Nanosized structured CeO2 materials, including nanospheres, nanorods [18], nanocubes and nanotubes, have been synthesized [12,19,20,21] Among these structures, nanorod-shaped CeO2 has received a substantial amount of attention because of its potentially large surface area and abundance of oxygen vacancy defects. Our team has performed research on CeO2, NiO/CeO2 and Ag/CeO2 nanorod frameworks synthesized by dealloying methods, which showed superior catalytic activity for CO oxidation due to their high porosities and large specific surface areas [30,31,32]. The formation mechanism, microstructure and catalytic mechanism of the nanoporous Pt/CeO2 were studied
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