Effect of the ruthenium loading and barium addition on the activity of ruthenium/carbon catalysts in carbon monoxide methanation

Truszkiewicz, Elżbieta; Raróg‐Pilecka, Wioletta; Zybert, Magdalena; Wasilewska-Stefańska, Malwina; Topolska, Ewa; Michalska, Kamila

doi:10.2478/pjct-2014-0079

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…The increased intensity of CH 4 evolution was recorded at temperatures higher than 500 • C. It was revealed that the addition of lanthanum significantly lowers the amount of evolved methane [29]. The addition of barium further enhances this positive effect, in agreement with the earlier literature reports for Ba-Ru/C catalysts [40][41][42][43]. The achieved, positive result shows that both metals used in the catalytic system act as methanation inhibitors, despite of the chemical forms of lanthanum and barium in the doubly doped systems and that there is a possible interaction between their compounds.…”

Section: H 2 -Tprsupporting

confidence: 90%

“…The H 2 -TPR measurements were performed in a thermogravimetric setup coupled with a mass spectrometer, according to the procedure presented in [40]. Netzsch STA 449C thermobalance equipped with a quadrupole mass spectrometer (Netzsch QMS 403C) was used for these measurements.…”

Section: Characterization Studiesmentioning

confidence: 99%

“…While the role of barium in increasing the protection of carbon support in relation to undesired methanation is clear [40][41][42][43], its potential as a promoter for CO x methanation catalysts is rather questionable [40]. On the other hand, the promoting influence of lanthanum on the activity of catalysts for the abovementioned process was confirmed in several works.…”

Section: Introductionmentioning

confidence: 98%

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CO Removal from Hydrogen Stream through Methanation on Ru/C Catalysts Doped with Lanthanum and Barium

et al. 2023

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The influence of the lanthanum and barium addition on the physicochemical properties and catalytic behavior of the Ru/C catalyst for CO methanation was investigated. The catalyst was doped with La or with La plus Ba. It was found out that there are various ways the additives were applied in the study, thus changing the catalytic performance of the basic material and influencing the susceptibility of the carbon support in relation to undesired methanation. The highest catalytic activity, 23.46 (mmol CO/gC+Ru × h), was achieved for the LaRu/C system, with methane selectivity exceeding 80% over the whole temperature range. Ba addition caused a significant decrease in activity. TG-MS studies revealed that both La and Ba improved the resistance of the carbon support to undesired methanation. Detailed characterization methods, employing XRPD, Raman spectroscopy, CO chemisorption, and SEM-EDX, showed that the catalytic behavior of the studied catalysts was attributed to lanthanum distribution over the Ru/C materials surface and structural changes in the carbon support affecting electron supply to the metallic active phase.

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Section: H 2 -Tprsupporting

confidence: 90%

Section: Characterization Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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CO Removal from Hydrogen Stream through Methanation on Ru/C Catalysts Doped with Lanthanum and Barium

et al. 2023

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“…Many literature reports give information about the influence of different factors on the activity of oxide-supported Ru systems [1,6,7,12,13,16,17]. However, there are few papers dealing with the activity of ruthenium deposited on thermally modified carbons [18,19]. There is also lack of information concerning the effect of Ru crystallite sizes on the activity of Ru/C systems.…”

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confidence: 99%

The Effect of the Ruthenium Crystallite Size on the Activity of Ru/Carbon Systems in CO Methanation

et al. 2017

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interest recently because of its potential as a simple technique for CO removal from H 2 -rich feed gases for fuel cells [1,[3][4][5][6][7]. Due to the poor reserves of natural gas in some regions of the world, conversion of syngas from coal or biomass to synthetic natural gas (SNG) via the methanation reaction is also attracting great attention [8][9][10][11]. That is the reason why many groups are still working to obtain highly active and selective catalysts for that reaction.Supported Ni-based catalysts have been applied commercially on methanation due to their high activity, selectivity to CH 4 and low costs [1,8,11]. However, hydrogenation of CO x to methane can be catalyzed by several metals [12][13][14]. Some experimental works and density functional theory (DFT) calculations also indicate that ruthenium exhibits excellent activity in CO methanation [1,4,15,16]. Ruthenium dispersed on high-surface area oxide supports has been found to exhibit high activity in the methanation of CO and CO 2 [3,5,13,14]. Many literature reports give information about the influence of different factors on the activity of oxide-supported Ru systems [1,6,7,12,13,16,17]. However, there are few papers dealing with the activity of ruthenium deposited on thermally modified carbons [18,19]. There is also lack of information concerning the effect of Ru crystallite sizes on the activity of Ru/C systems. In the present work we made an effort to examine the influence of the ruthenium particle size in the wide range of its dispersion on the catalytic activity of Ru/graphitized carbon systems in CO methanation. The activity tests were conducted in H 2 -rich streams with very low CO concentrations (0.5 vol% CO) to simulate industrial conditions of hydrogen cleaning for NH 3 synthesis or fuel cells application. AbstractThe influence of the ruthenium crystallite size on the catalytic activity of Ru/graphitized carbon systems in carbon monoxide methanation was evaluated. Four graphitized carbon materials differing in their surface area were used as supports for Ru. The average size of Ru crystallites in Ru/C materials was estimated by X-ray powder diffraction, transmission electron microscopy and CO chemisorption. Dispersion of the active phase clearly depends on the carbon texture. The activity tests conducted in H 2 -rich streams with very low CO concentrations (0.5 vol% CO) have shown that the activity of Ru/carbon catalysts changes with the ruthenium particles size (d). The highest activities were obtained for ruthenium particles in the range 4-8 nm in size.

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Oxidation of 5‐Hydroxymethylfurfural into 2,5‐Diformylfuran on Alkali Doped Ru/C Catalysts. Electron Properties of Ruthenium Species as Descriptor of Catalytic Activity

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et al. 2024

ChemSusChem

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Selective aerobic oxidation of 5‐hydroxymethylfurfural into 2,5‐diformylfuran has been achieved on alkali doped Ru/C catalyst. Optimization of Ru metal nanoparticles, as well as the nature and amount of the alkali dopant have been performed. The results showed that doping the Ru/C catalyst with controlled amount of potassium increases the catalytic activity, 2.5 fold with respect to the non‐doped sample. Spectroscopic studies showed that these differences in activity can be attributed to a different oxidation reaction mechanism associated to the presence of electron rich Ru species in the promoted sample that facilitate the dissociation of O2, while prevents the oxidation of the metal. The Ru/C‐K doped catalyst resulted very stable against leaching and metal sintering, being possible the reuse over several consecutive runs. Moreover, the catalyst could be successfully applied to the oxidation of different alcohols

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Effect of the ruthenium loading and barium addition on the activity of ruthenium/carbon catalysts in carbon monoxide methanation

Cited by 7 publications

References 20 publications

CO Removal from Hydrogen Stream through Methanation on Ru/C Catalysts Doped with Lanthanum and Barium

CO Removal from Hydrogen Stream through Methanation on Ru/C Catalysts Doped with Lanthanum and Barium

The Effect of the Ruthenium Crystallite Size on the Activity of Ru/Carbon Systems in CO Methanation

Oxidation of 5‐Hydroxymethylfurfural into 2,5‐Diformylfuran on Alkali Doped Ru/C Catalysts. Electron Properties of Ruthenium Species as Descriptor of Catalytic Activity

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