Low temperature carbon monoxide oxidation over gold nanoparticles supported on sodium titanate nanotubes

Tsai, Jui Ying; Chao, Jiunn Hsing; Lin, Chih‐Yuan

doi:10.1016/j.molcata.2008.10.019

Cited by 40 publications

(4 citation statements)

References 52 publications

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“…NaTNTs were prepared by a hydrothermal method described elsewhere, in which TiO 2 powder in 10 M aqueous NaOH was used [9][10][11]. NH 4 TNTs were prepared by ion exchange: 2.5 g of NaTNTs was mixed with 100 ml of 1.0 M aqueous NH 4 NO 3 , and the suspension solution was stirred at 333 K for 8 h. The ion exchange procedure was performed three times.…”

Section: Preparation Of Mtnts and Pt/mtntsmentioning

confidence: 99%

Effects of interfacial charge and the particle size of titanate nanotube-supported Pt nanoparticles on the hydrogenation of cinnamaldehyde

Chiu¹,

Lee²,

Li³

et al. 2013

Nanotechnology

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The oxidation state and size of Pt nanoparticles attached to alkali metal titanate nanotubes (MTNTs=M2Ti3O7, M = Li(+), Na(+), K(+), Cs(+)) via ion exchange (indicated by the added label '-IE') and wet impregnation (indicated by the added label '-IMP') methods varied systematically with the cation of the MTNTs. X-ray photoelectron spectroscopy revealed that the binding energy of Pt was reduced to a low value when the support was changed from LiTNTs to CsTNTs, yielding a Pt(δ-) oxidation state. Thus, a space charge layer (SCL) was constructed at the interface between the Pt particle and MTNT support; the former carried the negative charge, and the alkali cation and proton in the hydroxyl group of the latter carried the positive charge. Due to a higher M/Ti atomic ratio in MTNTs, a higher electron density accumulated on Pt particles in Pt/MTNTs-IMP than on those in Pt/MTNTs-IE. Sub-ambient temperature temperature-programmed reduction and transmission electron microscopy revealed that because of the difference in reducibility of PtOx/MTNTs, the mean Pt particle size followed the order Pt/CsTNTs> Pt/KTNTs > Pt/NaTNTs > Pt/LiTNTs and Pt/MTNTs-IMP > Pt/MTNTs-IE. DRIFTS (diffuse reflectance infrared Fourier transform spectroscopy) showed that owing to its interaction with SCL, cinnamaldehyde adsorbed on Pt mainly through the C=C bond at the Pt-MTNT interfaces, and the small Pt particles in Pt/LiTNTs adsorbed three times more cinnamaldehyde than those in Pt/CsTNTs. Due to the competition between the adsorption of cinnamaldehyde and C=C activation, Pt/KTNT-IMP is the most active Pt/MTNT catalysts, achieving a conversion of 100% in the hydrogenation of cinnamaldehyde at 2 atm and 313 K. The carbonyl stretching of adsorbed cinnamaldehyde was almost unperturbed by adsorption (at 1705 cm(-1)), suggesting that Pt(δ-) and the π electrons in the carbonyl group repel each other, so the CH=O group points upward and away from the Pt surface, preventing it from being hydrogenated and causing Pt/MTNTs to exhibit high 3-phenyl propionaldehyde selectivities of 75-80%.

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Section: Preparation Of Mtnts and Pt/mtntsmentioning

confidence: 99%

Effects of interfacial charge and the particle size of titanate nanotube-supported Pt nanoparticles on the hydrogenation of cinnamaldehyde

Chiu¹,

Lee²,

Li³

et al. 2013

Nanotechnology

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“…It is likely to occur in titanate nanotubes because they are well known as good ion exchanger (Kiss et al 2012). The higher energy (85.5 eV) band of Au + indicates that Au 3+ was reduced to Au + which participates widely in ion exchange reaction with titanate nanotubes as Au + represents a greater binding energy in the XPS in comparison with the state of the metallic gold (Tsai et al 2009).…”

Section: Resultsmentioning

confidence: 99%

Hydrogen production from aqueous glycerol using titanate nanotubes decorated with Au nanoparticles as photocatalysts

Marques

Morais

Nobre

et al. 2019

An. Acad. Bras. Ciênc.

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Protonated titanate nanotubes (hTiNts) were synthesized using the hydrothermal method, followed by proton exchange with acid. Gold nanoparticles decorated titanate nanotubes (AuhTiNts) were obtained by the reduction of AuCl 4 under vigorous stirring with an aqueous solution of hTiNts containing 1 wt% of ascorbic acid. To investigate the surface structural chemistry of the titanate and AuhTiNts, the following characterization methods were used: scanning and transmission electron microscopy, X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, Raman spectroscopy and X-ray photo-electron spectroscopy. The mean internal and external diameters for titanate nanotubes were found to be 5.46 ± 0.08 nm and 8.42 ± 0.03 nm, respectively, whereas the mean diameter of gold nanoparticles was measured to be 9.68 nm ± 0.03 nm. The as-synthesized AuhTiNts was used as photocatalyst in hydrogen production from glycerol as a sacrificial agent. The enhancement in the production of hydrogen, using the heterogeneous AuhTiNts catalysts, can be attributed to the intrinsic catalytic potential of gold as well as its interactions with titanate nanostructure.

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“…The development of low-temperature CO oxidation catalysts has received considerable attention (Tang et al, 2006;Cheng, et al, 2007;Oh et al, 2007;Qiao et al, 2008;Radkevich et al, 2008;Tsai et al, 2009;Kunkalekar and Salker, 2010;Slavinskaya et al, 2011;Carlsson and Skoglundh, 2011). There still is a need for development of catalysts that exhibit higher activities for prolonged periods at low temperatures (typically less than 100 C) and in a diverse range of oxidation environments.…”

Section: Catalytic Oxidation Of Comentioning

confidence: 99%

An Overview of Hydrophobic Catalyst Over Styrene-Divinylbenzene Copolymer

Wang

Ran

2012

Chemical Engineering Communications

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Low temperature carbon monoxide oxidation over gold nanoparticles supported on sodium titanate nanotubes

Cited by 40 publications

References 52 publications

Effects of interfacial charge and the particle size of titanate nanotube-supported Pt nanoparticles on the hydrogenation of cinnamaldehyde

Effects of interfacial charge and the particle size of titanate nanotube-supported Pt nanoparticles on the hydrogenation of cinnamaldehyde

Hydrogen production from aqueous glycerol using titanate nanotubes decorated with Au nanoparticles as photocatalysts

An Overview of Hydrophobic Catalyst Over Styrene-Divinylbenzene Copolymer

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