CeO2-Supported TiO2−Pt Nanorod Composites as Efficient Catalysts for CO Oxidation

Abstract

Supported Pt-based catalysts have been identified as highly selective catalysts for CO oxidation, but their potential for applications has been hampered by the high cost and scarcity of Pt metals as well as aggregation problems at relatively high temperatures. In this work, nanorod structured (TiO2−Pt)/CeO2 catalysts with the addition of 0.3 at% Pt and different atomic ratios of Ti were prepared through a combined dealloying and calcination method. XRD, XPS, SEM, TEM, and STEM measurements were used to confirm the phase composition, surface morphology, and structure of synthesized samples. After calcination treatment, Pt nanoparticles were semi-inlayed on the surface of the CeO2 nanorod, and TiO2 was highly dispersed into the catalyst system, resulting in the formation of (TiO2−Pt)/CeO2 with high specific surface area and large pore volume. The unique structure can provide more reaction path and active sites for catalytic CO oxidation, thus contributing to the generation of catalysts with high catalytic activity. The outstanding catalytic performance is ascribed to the stable structure and proper TiO2 doping as well as the combined effect of Pt, TiO2, and CeO2. The research results are of importance for further development of high catalytic performance nanoporous catalytic materials.

Comprehensive spectroscopy and photocatalytic activity analysis of TiO2-Pt systems under LED irradiation

“…Moreover, for the P25-Pt sample, a weak diffraction peak at 2θ = 40.1, corresponding to the (111) plane, can be seen, indicating the presence of metallic platinum (card no. 1011107) 39 . A close-up of the XRD pattern confirming the additional peak originating from platinum is shown in Figure S2 in the Supplementary Materials.…”

“…Moreover, for the P25-Pt sample, a weak diffraction peak at 2θ = 40.1, corresponding to the (111) plane, can be seen, indicating the presence of metallic platinum (card no. 1011107)39 . A close-up of the XRD pattern confirming the additional peak originating from platinum is shown in FigureS2in the Supplementary Materials.The presence of Pt NPs diffraction peaks in the diffraction pattern for P25-Pt suggests the effective deposition of nanocrystalline Pt particles on the material's surface, possibly organized in clusters large enough to give rise to characteristic diffraction signals of appreciable intensity.…”

A dysprosium(iii)-based triple helical-like complex as a turn-on/off fluorescence sensor for Al(iii) and 4,5-dimethyl-2-nitroaniline

“…This led to the quenching of fluorescence. 56 Fig. S9 † showed that the fluorescence lifetime of 1@EtOH decayed to 0.33 ns after DMNA was added due to the PET mechanism.…”