Pt/TiO2 composite nanoparticles synthesized by electron beam irradiation for preferential CO oxidation

Kageyama, Satoru; Sugano, Yoshitsune; Hamaguchi, Yukihiro; Kugai, Junichiro; Ohkubo, Yuji; Seino, Satoshi; Nakagawa, Takashi; Ichikawa, Satoshi; Yamamoto, Takao A.

doi:10.1016/j.materresbull.2012.11.028

Cited by 20 publications

(16 citation statements)

References 20 publications

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“…EBIRM is a radiolytic process wherein metal ions in an aqueous solution are reduced via irradiation using a high-energy electron beam. This method has been applied to a range of metal nanoparticles supported on the several particles: γ-Fe 2 O 3 , TiO 2 , and carbon particles [ 13 , 14 , 15 ]. This method has a number of advantages: no dangerous reductant or catalyst is required, the process requires a low temperature, and the time for electron-beam irradiation is extremely short.…”

Section: Introductionmentioning

confidence: 99%

Radiolytic Synthesis of Pt-Particle/ABS Catalysts for H2O2 Decomposition in Contact Lens Cleaning

et al. 2017

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A container used in contact lens cleaning requires a Pt plating weight of 1.5 mg for H2O2 decomposition although Pt is an expensive material. Techniques that decrease the amount of Pt are therefore needed. In this study, Pt nanoparticles instead of Pt plating film were supported on a substrate of acrylonitrile–butadiene–styrene copolymer (ABS). This was achieved by the reduction of Pt ions in an aqueous solution containing the ABS substrate using high-energy electron-beam irradiation. Pt nanoparticles supported on the ABS substrate (Pt-particle/ABS) had a size of 4–10 nm. The amount of Pt required for Pt-particle/ABS was 250 times less than that required for an ABS substrate covered with Pt plating film (Pt-film/ABS). The catalytic activity for H2O2 decomposition was estimated by measuring the residual H2O2 concentration after immersing the catalyst for 360 min. The Pt-particle/ABS catalyst had a considerably higher specific catalytic activity for H2O2 decomposition than the Pt-film/ABS catalyst. In addition, sterilization performance was estimated from the initial rate of H2O2 decomposition over 60 min. The Pt-particle/ABS catalyst demonstrated a better sterilization performance than the Pt-film/ABS catalyst. The difference between Pt-particle/ABS and Pt-film/ABS was shown to reflect the size of the O2 bubbles formed during H2O2 decomposition.

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Section: Introductionmentioning

confidence: 99%

Radiolytic Synthesis of Pt-Particle/ABS Catalysts for H2O2 Decomposition in Contact Lens Cleaning

et al. 2017

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“…The catalytic oxidation of CO to CO 2 at a low temperature is a very important reaction from the standpoint of environmental control [1] , and has widespread applications in air purification for buildings or cars, closed-cycle CO 2 lasers, CO detectors [2] and CO selective oxidation in reformer gas for fuel cell applications [3,4] . Recently, a variety of supported metal catalysts have been explored for CO oxidation [5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Effect of support calcination temperature on Ag structure and catalytic activity for CO oxidation

Zhang

Han

Zhao

et al. 2016

Chem. Res. Chin. Univ.

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SiO 2 with different nanostructures, namely hexagonal mesoporous silica(HMS), and three unordered commercial silica, were used as supports to fabricate silver catalysts using an incipient wetness impregnation method. It was found that Ag/HMS catalyst showed a high catalytic activity. Next, the HMS support was calcined at different temperatures before impregnation of AgNO 3 . The effect of calcination temperature of HMS support was investigated in terms of structure and catalytic activity of Ag catalysts. The support and catalysts were characterized by N 2 adsorption-desorption isotherms, Thermogravimetric-differential thermal analyzer, X-ray diffraction, H 2 -temperature program reduction and transmission electron microscopy. The results showed that calcination of HMS at an appropriate temperature(750 °C) before catalyst preparation would benefit the formation of highly dispersive small sized Ag particles on the HMS support and markedly enhance the catalytic activity of Ag/HMS catalyst toward CO oxidation.

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“…[11,12] A belt conveyor system using a cart has been adopted for the irradiation, wherein the irradiation time is less than 10 s. Therefore, this method is suitable for the mass production of nanoparticle catalysts. Previously, we reported the synthesis of monometallic nanoparticles on support materials, such as Au/Fe 3 O 4 [12] and Pt/TiO 2 , [13] using an EBIRM. In addition, by simply increasing the number of metal ion species, we successfully obtained bimetallic and trimetallic nanoparticles on support materials, such as PtAu/Fe 2 O 3 , [14] PtCu/Fe 2 O 3 , [14] PtNi/Fe 2 O 3 , [14] PtRu/C,[15À17] PtCu/C, [18] PtCo/C, [19] AuPd/C, [20] and PtRuAu/C.…”

Section: Introductionmentioning

confidence: 99%

Mass production of highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation using an electron-beam irradiation reduction method

Ohkubo

Kageyama

Seino

et al. 2015

Journal of Experimental Nanoscience

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An electron-beam irradiation reduction method (EBIRM) is a technique to reduce metal ions in an aqueous solution via irradiation with a high-energy electron beam. In this study, an EBIRM is improved to develop a technique for the mass production of highly loaded and highly dispersed PtRu/C catalysts for use as direct methanol fuel cell anodes. An increase in the Pt and Ru input concentrations increased the loading weight from 9 to 37 wt%; however, the dispersibility of the PtRu nanoparticles on the carbon particles decreased. To improve the low dispersibility, sodium phosphinate was added to the precursor solution and the input amount of carbon particles was decreased. These changes resulted in not only highly loaded but also highly dispersed PtRu/C catalysts. The catalytic activity of the highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation was at least 1.6 times higher than that of the lowly loaded and lowly dispersed PtRu/C catalysts in all voltage range. More than 6000 mg of highly loaded and highly dispersed PtRu/C catalysts were relatively easily obtained, and the average particle size of the PtRu nanoparticles was 1.8 nm. These results demonstrated that the improved EBIRM is effective for the mass production of carbon-supported, highly loaded, and highly dispersed metal nanoparticles.

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Pt/TiO2 composite nanoparticles synthesized by electron beam irradiation for preferential CO oxidation

Cited by 20 publications

References 20 publications

Radiolytic Synthesis of Pt-Particle/ABS Catalysts for H2O2 Decomposition in Contact Lens Cleaning

Radiolytic Synthesis of Pt-Particle/ABS Catalysts for H2O2 Decomposition in Contact Lens Cleaning

Effect of support calcination temperature on Ag structure and catalytic activity for CO oxidation

Mass production of highly loaded and highly dispersed PtRu/C catalysts for methanol oxidation using an electron-beam irradiation reduction method

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