Catalytic decomposition of N2O over highly active supported Ru nanoparticles (≤3nm) prepared by chemical reduction with ethylene glycol

Komvokis, V.G.; Martí, M. Cristina; Delimitis, A.; Vasalos, I.A.; Triantafyllidis, Konstantinos S.

doi:10.1016/j.apcatb.2011.01.009

Cited by 56 publications

(23 citation statements)

References 52 publications

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“…However, it can be clearly seen that the difference in the catalytic activities was smaller and smaller with the increase in reaction temperature above 375 °C among the Ru/Al2O3-H2, Ru/Al2O3-NaBH4 and Ru/Al2O3-air catalysts, and the N2O conversions were nearly 95% over these catalysts at 425 °C. In the literature [13,27,30,31,[36][37][38][39][40], the catalytic activity of catalysts was different for N2O decomposition, as shown in Table S1. Ru/r-TiO2 exhibited better activity than our prepared catalysts; however, the Ru content in Ru/r-TiO2 was far higher than 0.5%.…”

Section: Characterization Of Prepared Samplesmentioning

confidence: 99%

“…The catalytic activity of Ru metal was influenced by size, support, interaction and O2. Komvokis et al [13] reported that Ru formed with sizes from 1-3 nm with high dispersion (70%), which showed much higher catalytic activity and stability for N2O decomposition. In the case of Rh catalysts [29], Rh/MgO, Rh/SiO2 with Rh sizes of 2.1-2.4 nm were more active than Rh/CeO2, Rh/Al2O3 and Rh/TiO2 with small particles of 1.0-1.4 nm for the N2O decomposition.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ru Species on N2O Decomposition over Ru/Al2O3 Catalysts

et al. 2016

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Abstract:Ru is considered as an effective active species for N 2 O decomposition; however, there is disagreement about which ruthenium species is key for catalytic activity. In order to understand the role of Ru species in N 2 O decomposition, Ru/Al 2 O 3 (Ru/Al 2 O 3 -H 2 , Ru/Al 2 O 3 -NaBH 4 , Ru/Al 2 O 3 -air) catalysts with different ratios of metallic Ru were prepared and evaluated for their catalytic activities. Various characterizations, especially in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), were applied to investigate the relationship between activity and different Ru species. The results indicate that the N 2 O conversion displayed a linear relationship with the amount of metallic Ru. The DRIFTS results of adsorption for N 2 O show that metallic Ru was the active site. The catalytic processes are put forward based on metallic Ru species. The deactivation with increasing times used is due to the decrease in the amount of metallic Ru and agglomerates of Ru particles on the surface of catalysts.

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Section: Characterization Of Prepared Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Ru Species on N2O Decomposition over Ru/Al2O3 Catalysts

et al. 2016

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“…In the literature, the polyol method, in which the polyol acts both as a solvent of the metal salt and as reducing agent, has been considered as a simple method with reproducible results. In fact, several examples exist in the literature with regard to the preparation of Ru NPs with enhanced catalytic properties in NH 3 synthesis [8], hydrogenation of phenol [9], partial oxidation of methane [10] or decomposition of N 2 O [11].…”

Section: Introductionmentioning

confidence: 99%

“…Many of methods and media for prepare bimetallic NPs are the same as for pure monometallic NPs [5,14]. The Ru NPs are frequently produced by the alcohol reduction such as ethylene glycol, which serve as a solvent and reducing agent [4,[8][9][10][11]. Unsupported bimetallic RuRe NPs have been synthesized only by the thermal decomposition of metal carbonyl precursors [15].…”

Section: Introductionmentioning

confidence: 99%

Microwave Assisted Polyol Synthesis of the Bimetallic RuRe Nanoparticles Deposited on γ-Alumina and their Application for the Light Alkane Oxidation

Baranowska

Okal

2016

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The RuRe nanoparticles (NPs) deposited on cAl 2 O 3 were prepared in a one step by a microwave-polyol method and tested in the total oxidation of short chain alkanes under O 2 -rich conditions. The used preparation method favored the formation of spherical metallic RuRe NPs with the mean particle size of 1.6 nm (Ru:Re = 90:10) and 2.1 nm (Ru:Re = 75:25), (HRTEM studies) and dispersion of 26 and 31 %, respectively (H 2 chemisorption data). The Ru nano-catalyst exhibited larger Ru NPs (2.9 nm) with lower degree of dispersion (19 %). The activity of the bimetallic RuRe nano-catalysts for the total oxidation of propane, used as a model compound, was higher compared to that of the Ru nano-catalyst. The superior catalytic performance of the former catalysts, especially of the sample with the low Re loading (1 wt%, RuRe = 90:10, 0.6-3 nm particle size), could be correlated with a high ruthenium dispersion (H/Ru = 31 %), i.e., the high surface area of the Ru phase available for reaction, and to the higher intristic activity caused by the synergy effect between Re and Ru. Moreover, the RuRe nano-catalysts exhibited better stability with respect to the Ru nano-catalyst under used reaction conditions.

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“…Among them, direct catalytic decomposition of N 2 O into N 2 and O 2 is the most attractive, because this process has low operating costs and produces no harmful gases [7]. Catalysts used for N 2 O decomposition include supported metal catalysts [8,9], metal oxides [10][11][12][13], and zeolite-based catalysts [14][15][16][17][18]. Rh- [8,, Ru- [25,26], and Ir-based [27] catalysts have been reported to be active for N 2 O decomposition.…”

Section: Introductionmentioning

confidence: 99%