Influence of metal-support interaction on nitrate hydrogenation over Rh and Rh-Cu nanoparticles dispersed on Al 2 O 3 and TiO 2 supports

State, Razvan; Scurtu, Mariana; Miyazaki, Akane; Papa, Florica; Atkinson, Irina; Munteanu, Cornel; Balint, Ioan

doi:10.1016/j.arabjc.2017.05.009

Cited by 17 publications

(7 citation statements)

References 38 publications

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“…The choice of these materials consists in their inert behavior in various environments. The process of catalyst arrangement on a support can be achieved using precipitation and impregnation method (Munnik et al 2015 ; State et al 2017 ), conducted in a batch reactor. Precipitation techniques induce metal particle growth by supersaturation of the precursor solution, resulting in metal particle nucleation and growth.…”

Section: Introductionmentioning

confidence: 99%

Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

2018

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The synthesis of palladium nanoparticles and conditions of their deposition on active carbon fibers in the microreactor was described. All processes related with metal ion reduction, nucleation, and autocatalytic growth of particles as well as their deposition were carried out in the microreactor in only one cycle. Synthesis of palladium nanoparticles was carried out under different conditions, i.e., changing the initial concentration of metal ions and the reductant, at 40 °C. Depending on the conditions imposed, the nanoparticles of different size (hydrodynamic radius change from 12 to 37 nm) and shape (spherical, cube, pyramid) were obtained. It was also shown that flow conditions allow for much more efficient Pd deposition on active carbon fibers than the process carried out in the batch. It was observed that for concentrations of Pd(II) ions higher than 0.2 mM, the degree of fiber surface coverage increased significantly in comparison with the batch process.Electronic supplementary materialThe online version of this article (10.1007/s11051-018-4337-9) contains supplementary material, which is available to authorized users.

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Section: Introductionmentioning

confidence: 99%

Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

2018

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“…It is noteworthy that, in previously reported studies [ 45 , 46 , 47 ], monometallic catalysts were found to be inactive for nitrate (

) reduction and addition of co-metals, such as In, Cu and Sn are typically required to reduce the nitrate in an aqueous phase. However, Huo et al [ 48 ] showed that reduction of aqueous nitrate (

was possible by using monometallic Ru/C catalyst at controlled pH condition (pH 5.0).…”

Section: Resultsmentioning

confidence: 99%

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

et al. 2021

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Effect of platinum nanoparticle size on catalytic reduction of nitrate in liquid phase was examined under ambient conditions by using hydrogen as a reducing agent. For the size effect study, Pt nanoparticles with sizes of 2, 4 and 8 nm were loaded silica support. TEM images of Pt nanoparticles showed that homogeneous morphologies as well as narrow size distributions were achieved during the preparation. All three catalysts showed high activity and were able to reduce nitrate below the recommended limit of 50 mg/L in drinking water. The highest catalytic activity was seen with 8 nm platinum; however, the product selectivity for N2 was highest with 4 nm platinum. In addition, the possibility of PVP capping agent acting as a promoter in the reaction is highlighted.

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“…There is no consumption of hydrogen at higher temperatures; therefore, the thermal treatments proposed guaranteed the total reduction of the metal. The peak of TPR at low temperature belongs to well dispersed Rh2O3, which is easily formed, while the peak of TPR at high temperature belongs to the reduction of crystalline Rh2O3 or larger particles of Rh2O3 [20]. Before the reduction process, the metal was in the Rh2O3 phase.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Correlation of Rh Particle Size with CO Chemisorption: Effect on the Catalytic Oxidation of MTBE

et al. 2019

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This study was conducted to identify the correlation between the CO chemisorption (linear interaction and gem dicarbonyl) and the specific size of rhodium particles, and further to determine the influence of this relationship on the catalytic oxidation reaction of methyl tert-butyl ether (MTBE). During the synthesis, first, TiO2 was developed by the sol-gel method under acidic conditions. Second, Rh was deposited (1 wt %) by the incipient wetness impregnation method. Later, with the aim of controlling the particle size, the Rh/TiO2 materials were crystallized at different reduction conditions during 3 h heat treatment. The results obtained by TEM micrographs indicated that the average particle size varies between 1.0 and 8.1 nm, depending on the conditions of heat treatment. From the histogram analysis of each TEM micrograph, two correlations were made: (i) the gem-dicarbonyl interaction was typical of Rh particles ≤ 1.5 nm, and (ii) a linear interaction, bridged interaction and dentate interaction were observed in particles ≥ 1.6 nm. The gem-dicarbonyl interaction (particle size ≤ 1.5 nm) was the most active in the oxidation reaction of MTBE.

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Influence of metal-support interaction on nitrate hydrogenation over Rh and Rh-Cu nanoparticles dispersed on Al 2 O 3 and TiO 2 supports

Cited by 17 publications

References 38 publications

Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

Green method for efficient PdNPs deposition on carbon carrier in the microreactor system

Effect of Nanoparticle Size in Pt/SiO2 Catalyzed Nitrate Reduction in Liquid Phase

Correlation of Rh Particle Size with CO Chemisorption: Effect on the Catalytic Oxidation of MTBE

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