Promotion of low-temperature oxidation of CO over Pd supported on titania-coated ceria

Satsuma, Atsushi; Yanagihara, Masatoshi; Osaki, Kaoru; Saeki, Yurina; Liu, Heng; Yamamoto, Yuta; Arai, Shigeo; Ohyama, Junya

doi:10.1039/c4ra10167g

Cited by 15 publications

(15 citation statements)

References 48 publications

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“…in solid oxide fuel cells [3], and applications are discussed even in pharmacology due to their antioxidant properties [4]. Cerium oxides are contained as catalysts in the three-way converter for automotive exhaust control [5], they are active in the water-gas shift reaction [6,7], in the steam reforming of oxygenates [8], in soot oxidation [9], in the preferential oxidation of CO [10] and in the activation of CO 2 [11]. It has been recognized in the last two decades that thin films of oxides supported on metal surfaces provide a very useful concept as model systems for catalysis studies, allowing the controlled investigation of elementary reaction steps at the molecular level [12].…”

Section: Graphenementioning

confidence: 99%

Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system

2016

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The growth of ceria nanoclusters on single-layer graphene on Ru(0001) has been examined, with a view towards fabricating a stable system for model catalysis studies. The surface morphology and cluster distribution as a function of oxide coverage and substrate temperature has been monitored by scanning tunneling microscopy (STM), whereas the chemical composition of the cluster deposits has been determined by Auger electron spectroscopy (AES). The ceria nanoparticles are of the CeO 2 (111)-type and are anchored at the intrinsic defects of the graphene surface, resulting in a variation of the cluster densities across the macroscopic sample surface. The ceria clusters on graphene display a remarkable stability against reduction in ultrahigh vacuum up to 900 K, but some sintering of clusters is observed for temperatures >450 K. The evolution of the cluster size distribution suggests that the sintering proceeds via a Smoluchowski ripening mechanism, i.e. diffusion and aggregation of entire clusters.

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Section: Graphenementioning

confidence: 99%

Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system

2016

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“…Furthermore, our CuO-TiO 2 NT catalysts exhibited 100% CO conversion at a lower temperature compared to the TiO 2 -supported Au catalysts reported in the same study [54]. Moreover, comparing our catalysts to Pd catalysts supported on a CeO 2 -TiO 2 mixed oxide [55] and that supported on ZrO 2 [56] with a T 100 value close to 150 • C, the merit of the non-plasmonic CuO-TiO 2 NT catalyst with T 100 = 155 • C is notable given the comparable CO oxidation potency, lower cost, and the long-term thermal stability. …”

Section: Effect Of Cu Content On Co Oxidationmentioning

confidence: 99%

A Study of Low-Temperature CO Oxidation over Mesoporous CuO-TiO2 Nanotube Catalysts

2017

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Supported copper oxide nanoparticles have attracted considerable attention as active and non-precious catalysts for many catalytic oxidation reactions. Herein, mesoporous xCuO-TiO 2 nanotube catalysts were fabricated, and their activity and kinetics toward CO oxidation were studied. The morphology and structure of the prepared catalysts were systematically studied using SEM, TEM, EDS, EDX, XRD, TGA, BET, XPS, H 2 -TPR, and Raman techniques. The BET surface area study revealed the effect of the large surface area of the mesoporous TiO 2 nanotubes on promoting the catalytic activity of prepared catalysts. The results also revealed the existence of strong metal-support interactions in the CuO-TiO 2 nanotube catalyst, as indicated by the up-shift of the E 2g vibrational mode of TiO 2 from 144 cm −1 to 145 cm −1 and the down-shift of the binding energy (BE) of Ti 2p 3/2 from 458.3 eV to 458.1 eV. The active phase of the catalyst consists of fine CuO nanoparticles dispersed on a mesoporous anatase TiO 2 nanotube support. The 50-CuO-TiO 2 nanotube catalyst demonstrated the highest catalytic activity with 100% CO conversion at T 100 = 155 • C and a reaction rate of 36 µmole s −1 g −1 . Furthermore, the catalyst demonstrated excellent long-term stability with complete CO conversion that was stable for 60 h under a continuous stream. The enhanced catalytic activity is attributed to the interplay at the interface between the active CuO phase and the TiO 2 nanotubes support.

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“…Compared to precious metal-based catalysts, these CuO catalysts with tuned reducibility exhibit high catalytic activity for CO oxidation and lower conversion temperatures and can be produced at lower cost of synthesis and processing. Our CuO catalysts demonstrated complete CO conversion at a temperature lower than that of CuO-supported Au catalysts 54 and those of Pd catalysts supported on a CeO 2 -TiO 2 mixed oxide 55 and on ZrO 2 . 56 Interestingly, our catalyst exhibits higher catalytic activity than pure CuO catalyst reported by Zhu et al and the activity of our catalysts is comparable to the copper-ceria catalyst reported therein.…”

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confidence: 99%

Tailoring the reducibility and catalytic activity of CuO nanoparticles for low temperature CO oxidation

et al. 2018

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Promotion of low-temperature oxidation of CO over Pd supported on titania-coated ceria

Abstract: Pd/TiO2–CeO2 is proposed as a promising catalyst for low-temperature oxidation of CO with 100 °C lower light-off temperature than Pd/Al2O3.

Cited by 15 publications

References 48 publications

Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system

Ceria nanoclusters on graphene/Ru(0001): A new model catalyst system

A Study of Low-Temperature CO Oxidation over Mesoporous CuO-TiO2 Nanotube Catalysts

Tailoring the reducibility and catalytic activity of CuO nanoparticles for low temperature CO oxidation

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