Synthesis by Microwaves of Bimetallic Nano-Rhodium-Palladium

Ugalde, M.; Chavira, E.; Ochoa-Lara, M.T.; Figueroa, I.A.; Quintanar, Carlos; Tejeda, Adalberto

doi:10.1155/2013/578684

Cited by 3 publications

(1 citation statement)

References 44 publications

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“…Methods are employed these days of obtaining nanocomposites comprised of carbon nanotubes and rhodium and palladium nanoparticles using plasma [10], chemical reduction, [11] electrodesposition [12], electroless deposition [1], chemical and physical vapour deposition [12], electrochemical method [13,14], chemical methods with reduction of colloidal solutions [15] and methods utilising gamma irradiation [15]. The precursors of rhodium and palladium particles in different decoration processes include most frequently: colloid solutions [10], of particular metals, RhCl 3 •3H 2 O [16], 99.9% pristine rhodium [17] Rh(acac) 3 [18] and PdAc 2 [19], (NH 4 ) 2 [PdCl 4 ] [14], K 2 PdCl 4 [14], PdCl 2 [15], Na 2 PdCl 4 [20]. In order to be able to apply a broad range of CNT-NPs-type nanocomposites in the modern industry, an optimum technology must be developed enabling the controlled, uniform deposition of nanoparticles of a given metal onto the surface of carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Nanocomposites Consisting of Carbon Nanotubes and Nanoparticles of Noble Metals

Dobrzańska-Danikiewicz

Cichocki

Łukowiec

2016

MSF

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In the framework of the made researches nanocomposite of CNT-NPs type (Carbon Nanotube-Nanoparticles) consisting of multiwalled carbon nanotubes coated by rhodium nanoparticles and/or palladium using the two-step indirect method: chemical reduction have been produced. In the researches high-quality multi-walled carbon nanotubes MWCNTs with a length of 100 to 500 nm and a diameter of 8 to 20 nm previously obtained in the catalytic-chemical vapour deposition CCVD have been used. Nanotubes produced within the framework of own researches contain minor amounts of metallic impurities and amorphous carbon deposits. In order to deposit the noble metal nanoparticles on the surface of carbon nanotubes functionalization of multi-walled carbon nanotubes in a mixture of H2SO4 and HNO3 acids have been used. The prepared material has been subjected chemical reduction using noble metal precursors (RhCI3, PdCl2). The characterization of the produced material including the examination of the structure, morphology, chemical composition and evaluation of the size and distribution of rhodium and/or palladium nanoparticles on the surface of carbon nanotubes has been performed using: scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS). The produced nanomaterials may be used as the active layer of sensors of chemical/biological agents.

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Section: Introductionmentioning

confidence: 99%

Nanocomposites Consisting of Carbon Nanotubes and Nanoparticles of Noble Metals

Dobrzańska-Danikiewicz

Cichocki

Łukowiec

2016

MSF

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Density functional theory studies on the structures and NO molecule adsorption and dissociation of RhmPdn (m + n = 13) clusters

Yang,

Wu,

Guo

et al. 2023

J Nanopart Res

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Comparative performance of M-MCM-41 (M: Cu, Co, Ni, Pd, Zn and Sn) catalysts for steam reforming of methanol

Abrokwah

Deshmane

Kuila

2016

Journal of Molecular Catalysis A: Chemical

109

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1One-pot hydrothermal procedure was used to synthesize high surface area M- 2 Co, Ni, Pd, Zn, and Sn) nanocatalysts. The M-MCM-41 catalysts containing 10wt% of different 3 metals were examined to evaluate the performance of individual metals in steam reforming of 4 methanol (SRM) in terms of activity, selectivity and long term stability under similar operating 5 conditions. The fresh and spent catalysts were characterized using BET, XRD, TGA-DSC, TEM, 6 TPR, ICP-OES, EDX, Raman, and FTIR analytical techniques. Cu-MCM-41 showed the best 7 performance in terms of activity and selectivity among the different catalysts investigated in this 8 study. The overall SRM reactivity trend for different metals based on methanol conversion 9 followed the order: Cu-MCM-41 > Pd-MCM-41 > Sn-MCM-41 > Ni-MCM-41 ≈ Zn-MCM-41 > 10 Co-MCM-41. The catalytic performance of Cu-MCM-41 at 250 °C using 1:3 methanol-water mole 11 ratios showed 100% H2 selectivity, ~6% CO, and no methane formation. The time-on-stream 12 studies conducted continuously for 40 h at 300 °C revealed that Cu-MCM-41 was the most stable 13 catalysts and displayed consistent steady state conversion (up to74%). The SRM activity of Pd, Sn 14 and Zn was comparatively better; however, they deactivated steadily with time. Although coking 15 was a major factor in deactivation of the catalysts, degradation of the mesoporous structure and 16 thermal sintering appeared to play an influential role in deactivation, particularly in the case of Sn-17 MCM-41. 18 Keywords: One-pot synthesis; metal-MCM-41 catalysts; steam reforming of methanol; catalyst 19 stability; Cu, Co, Ni, Pd, Zn, and Sn. 20 . 21 22 1. Introduction 1 Transition from non-replenishable fossil fuel energy to alternative clean energy such as 2 hydrogen is no longer an academic debate. Catalytic steam reforming of renewable alcohols (e.g. 3 methanol, glycerol and ethanol) is a highly favored route to produce hydrogen to generate 4 electricity, as well as, to power portable electronic gadgets and vehicles using fuel cell technology. 5 Traditionally, copper based catalysts supported on Al2O3, ZnO and ZrO2 have been studied and 6 used for commercial alcohol steam reforming processes [1-3]. Recently, Zhang et al. [4] showed 7 that Cu supported on three different supports (CeO2, ZrO2 and CeO2-ZrO2) exhibited significant 8 contrast in catalytic performance towards steam reforming of methanol. Hirunsit and 9 Faungnawakij demonstrated that Cu-based spinel-lattice catalysts possess high thermal stability 10 which suppresses Cu sintering at high reaction temperature [5]. In contrast, we and others [6-10] 11 have focused on the use of high surface area mesoporous supports (e.g. MCM-41, SBA-15, and 12 TiO2) for steam reforming, which tend to avail a high catalytic surface area with well defined large 13 pore sizes mitigating the catalyst deactivation (via sintering) by enhancing uniform dispersion of 14 the active metal particles. Recently, the versatility and robustness of these mesoporous silica 15 nanomaterials (MSNs) a...

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Synthesis by Microwaves of Bimetallic Nano-Rhodium-Palladium

Cited by 3 publications

References 44 publications

Nanocomposites Consisting of Carbon Nanotubes and Nanoparticles of Noble Metals

Nanocomposites Consisting of Carbon Nanotubes and Nanoparticles of Noble Metals

Density functional theory studies on the structures and NO molecule adsorption and dissociation of RhmPdn (m + n = 13) clusters

Comparative performance of M-MCM-41 (M: Cu, Co, Ni, Pd, Zn and Sn) catalysts for steam reforming of methanol

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