Selective oxidation of CO in H2-rich stream over ZSM5 zeolites supported Ru catalysts: An investigation on the role of the support and the Ru particle size

Scirè, Salvatore; Fiorenza, Roberto; Gulino, Antonino; Cristaldi, Antonio; Riccobene, Paolo Maria

doi:10.1016/j.apcata.2016.04.011

Cited by 26 publications

(31 citation statements)

References 52 publications

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“…For these reasons, the CeO 2 -MnO x mixed oxides have reported good catalytic activity for various oxidation reactions [22][23][24]. To the best of our knowledge, few papers deal with the PROX performance of Ru-based catalysts supported on CeO 2 or CeO 2 -based materials, although it has been reported that the Ru-based catalysts were more active and selective than Pt-based ones below 150 • C [10,25], an optimal temperature range for a possible use of these catalysts for the hydrogen purification in the PEMFC or for the alkaline fuel cells (AFC).…”

Section: Introductionmentioning

confidence: 99%

“…Reasonably at high temperature, the reverse water-gas shift (RWGS) reaction (CO 2 + H 2 ↔ CO + H 2 O) becomes significant (Ea = 120-160 kJ/mol, higher than that found for PROX, 70-100 kJ/mol [5,25]). In fact, on Ru-based catalysts RWGS has been reported to occur at T > 150 • C [10,25], therefore justifying the drop of activity at higher temperatures. Specifically, it is worth noting that the CO conversion upper value and its temperature rely on the mixed-oxide support used.…”

Section: Catalytic Activitymentioning

confidence: 99%

“…The profile of the Ru/CeO 2 sample displays two reduction peaks at 165 • C and 190 • C and a shoulder at ca. 325 • C. According to literature data, the peak at 165 • C is characteristic of the reduction of the ruthenium precursor salt (Ru(NO)(NO 3 ) 3 ), while the peak at 190 • C is assigned to the reduction of well dispersed ruthenium oxide particles on the surface of the support [10,33]. The shoulder at 325 • C reasonably originates from the reduction of the ceria surface oxygens shifted to lower temperature as a result of the interaction with the ruthenium species.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

“…Therefore, the catalyst of this process must be highly selective towards the first reaction. Noble-metal catalysts, such as Pd [8], Rh [9], Ru [10,11], Au [12][13][14] and Pt [15,16], have revealed good CO-PROX performance. The selection of the proper support has been also found crucial in addressing the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Ru–Pd Bimetallic Catalysts Supported on CeO2-MnOX Oxides as Efficient Systems for H2 Purification through CO Preferential Oxidation

et al. 2018

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Abstract:The catalytic performances of Ru/ceria-based catalysts in the CO preferential oxidation (CO-PROX) reaction are discussed here. Specifically, the effect of the addition of different oxides to Ru/CeO 2 has been assessed. The Ru/CeO 2 -MnO x system showed the best performance in the 80-120 • C temperature range, advantageous for polymer-electrolyte membrane fuel cell (PEMFC) applications. Furthermore, the influence of the addition of different metals to this mixed oxide system has been evaluated. The bimetallic Ru-Pd/CeO 2 -MnO x catalyst exhibited the highest yield to CO 2 (75%) at 120 • C whereas the monometallic Ru/CeO 2 -MnO x sample was that one with the highest CO 2 yield (60%) at 100 • C. The characterization data (H 2 -temperature programmed reduction (H 2 -TPR), X-ray diffraction (XRD), N 2 adsorption-desorption, diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), X-ray photoelectron spectroscopy (XPS)) pointed out that the co-presence of manganese oxide and ruthenium enhances the mobility/reactivity of surface ceria oxygens accounting for the good CO-PROX performance of this system. Reducible oxides as CeO 2 and MnO x , in fact, play two important functions, namely weakening the CO adsorption on the metal active sites and providing additional sites for adsorption/activation of O 2 , thus changing the mechanism from competitive Langmuir-Hinshelwood into non-competitive one-step dual site Langmuir-Hinshelwood/Mars-van Krevelen. As confirmed by H 2 -TPR and XPS measurements, these features are boosted by the simultaneous presence of ruthenium and palladium. The strong reciprocal interaction of these metals between them and with the CeO 2 -MnO x support was assumed to be responsible of the promoted reducibility/reactivity of CeO 2 oxygens, thus resulting in the best CO-PROX efficiency at low temperature of the Ru-Pd/CeO 2 -MnO x catalyst. The higher selectivity to CO 2 found on the Ru-Pd system, which reduces the undesired H 2 consumption, represents a promising result of this research, being one of the key aims of the design of CO-PROX catalysts.

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Section: Introductionmentioning

confidence: 99%

Section: Catalytic Activitymentioning

confidence: 99%

Section: Catalysts Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ru–Pd Bimetallic Catalysts Supported on CeO2-MnOX Oxides as Efficient Systems for H2 Purification through CO Preferential Oxidation

et al. 2018

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“…Synthesis PANI under solution into a thin film [6] and nanoparticle with a low cost process can be achieved easily, while conductivity and catalytic activity can vary depend on the particle size [23][24][25], and form of the oxidation level on the both benzenoid and quinoid series structure [5,18,26,27]. Specific to the application of polyaniline as a catalyst for hydrocarbon oxidation, the decreasing of nanoparticle size from 80-100 nm to 10-20 nm improve its catalytic reactivity [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Polyaniline Nanoparticle by Inverse Micelle Microemulsion Method

Chasana

Ulfa

Masruri

2017

J. Pure App. Chem. Res.

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Polyaniline (PANI) is a conductive polymer and potential for application in the electronic device manufacturing. This paper discloses a recent strategy in synthesis polyaniline nanoparticle (NP-PANI) using inverse micelle (IM) microemulsion method, and also characterization of the provided products. The synthesis step was conducted by mixing of aniline as a polymer precursor with PEG 400, n-hexane, n-butanol, ammonium persulfate and hydrochloric acid in three different reaction times, i.e. for 2, 6, and 12 hours at 26 o C. NP-PANI was afforded as a brown powder in 2.87%, 1.97% and 2.30% yield for NP-PANI-IM-2, NP-PANI-IM-6 and NP-PANI-IM-12. The characteristic on ultra violetvisible and infrared spectra exhibited NP-PANI was formed as an emeraldine salt oligomer. Moreover, their morphology was observed through scanning electron microscopy (SEM) and showed a different range of nanoparticle size, i.e. 50-62, 68-72 and 58-62 nm for NP-PANI-IM-2, NP-PANI-IM-6 and NP-PANI-IM-12, respectively. These products open the potency application in material science.

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Intrazeolite CO Methanation by Small Ruthenium Carbonyl Complexes: Translation from Free Clusters into the Cage

et al. 2020

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Catalytic CO methanation represents an important reaction to improve the feed gas quality for hydrogen fuel cells. Previously, the large potential of small bare and ligated ruthenium clusters as highly selective and active catalysts has been shown by employing gas phase clusters as model systems. Now, density functional theory (DFT) calculations are employed to demonstrate the possibility to translate the gas phase CO methanation reaction mediated by a ligated Ru4(CO)13H2+ complex into the framework of a ZSM‐5 zeolite. Such a translation, manifested by a reaction pathway which is mechanistically and energetically similar to the gas phase analogue, is possible since the zeolite framework does not influence the reactive center. Furthermore, we reveal the important role of the CO ligand environment in protecting the Ru4+ metal core from formation of bonds with the zeolite and in the creation of the reactive center by promoting the cooperatively enhanced adsorption and dissociation of H2.

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Selective oxidation of CO in H2-rich stream over ZSM5 zeolites supported Ru catalysts: An investigation on the role of the support and the Ru particle size

Cited by 26 publications

References 52 publications

Ru–Pd Bimetallic Catalysts Supported on CeO2-MnOX Oxides as Efficient Systems for H2 Purification through CO Preferential Oxidation

Ru–Pd Bimetallic Catalysts Supported on CeO2-MnOX Oxides as Efficient Systems for H2 Purification through CO Preferential Oxidation

Synthesis and Characterization of Polyaniline Nanoparticle by Inverse Micelle Microemulsion Method

Intrazeolite CO Methanation by Small Ruthenium Carbonyl Complexes: Translation from Free Clusters into the Cage

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