EXAFS Study on Structural Change of Charcoal-supported Ruthenium Catalysts during Lignin Gasification in Supercritical Water

Yamaguchi, Aritomo; Hiyoshi, Norihito; Sato, Osamu; Osada, Motonobu; Shirai, Masayuki

doi:10.1007/s10562-007-9368-2

Cited by 36 publications

(17 citation statements)

References 19 publications

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“…The finding of metallic ruthenium is further in agreement with reports on the catalytic gasification of lignin by Ketchie et al [35] and Ya maguchi et al [36,37] However, these findings are in contradiction to the report of Park and Tomiyasu, [38] who proposed a mechanism with a redox couple Ru +4 /Ru +2 (i.e. RuO 2 / RuO) for the hydrothermal gasification over unsupported RuO 2 .…”

Section: Ru/c Ratio [At%]supporting

confidence: 89%

Characterization of a Spent Ru/C Catalyst after Gasification of Biomass in Supercritical Water

Wambach

Schubert²,

Döbeli³

et al. 2012

Chimia

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Carbon-supported ruthenium catalysts promote the gasification of aqueous organic feed with high efficiency to synthetic natural gas in supercritical water. Ruthenium metal was recently identified as the catalytically active species. [1] Occasionally deactivation is observed. To understand the deactivation, the fresh and several spent catalyst samples were investigated by RBS, ERDA, and XPS. The data revealed a massive reduction of the ruthenium concentration in toto and especially of the surface concentration. Of importance is the almost complete disappearance of the spectral features in the valance band region. Coverage of the ruthenium clusters e.g. with a thin 'carbonaceous' layer, i.e. a kind of fouling, or structural modifications of the ruthenium clusters might be the origin. Additionally, leaching of ruthenium might contribute, but is not considered a major effect, because ruthenium was never found in the liquid effluent of the reactor. The influence of additionally detected corrosion products (Ni, Cr, Fe, Ti) from the stainless steel and the titanium alloy walls seems to be small. No evidence for a deactivation by sulphur could be found.

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Section: Ru/c Ratio [At%]supporting

confidence: 89%

Characterization of a Spent Ru/C Catalyst after Gasification of Biomass in Supercritical Water

Wambach

Schubert²,

Döbeli³

et al. 2012

Chimia

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“…[28] Recycled paper (Nippon Paper Industries Co., Ltd., N100 for a plain paper copier) was used as a reactant in the form of pieces of 100 mm 2 . Cellulose powder (Advantec Co., Ltd., Advantec D, 40-100 mesh) and microcrystalline cellulose (Alfa Aesar) were also used as reference reactants.…”

Section: Methodsmentioning

confidence: 99%

Gaseous Fuel Production from Nonrecyclable Paper Wastes by Using Supported Metal Catalysts in High‐Temperature Liquid Water

et al. 2010

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Paper wastes are used for the production of gaseous fuels over supported metal catalysts. The gasification of the nonrecyclable paper wastes, such as shredded documents and paper sludge, is carried out in high-temperature liquid water. The order of the catalytic activity for the gasification is found to be ruthenium>rhodium>>platinum>>palladium. A charcoal-supported ruthenium catalyst (Ru/C) is the most effective for the gasification of paper and cellulose. Paper wastes are gasified to a limited degree (32.6 carbon %) for 30 min in water at 523 K to produce methane and carbon dioxide, with a small amount of hydrogen. At 573 K, more complete gasification with almost 100 carbon % is achieved within 10 min in water. At 523 K, the gas yield of paper gasification over Ru/C is higher than that of cellulose powder. The gas yields are increased by ball-milling treatment of the recycled paper and cellulose powder. Printed paper wastes are also gasified at 523 K in water.

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“…Lignin model compounds were decomposed in a batch reactor made of stainless steel 316 tube with an inner volume of 6.0 cm 3 in the similar method for lignin gasification in our papers383940. In a typical catalytic reaction, 0.15 g of the catalyst, 0.10 g of lignin model compounds, and 3.0 g of water were added to the reactor.…”

Section: Methodsmentioning

confidence: 99%

Bond cleavage of lignin model compounds into aromatic monomers using supported metal catalysts in supercritical water

Yamaguchi

Mimura

Shirai

et al. 2017

Sci Rep

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More efficient use of lignin carbon is necessary for carbon-efficient utilization of lignocellulosic biomass. Conversion of lignin into valuable aromatic compounds requires the cleavage of C–O ether bonds and C–C bonds between lignin monomer units. The catalytic cleavage of C–O bonds is still challenging, and cleavage of C–C bonds is even more difficult. Here, we report cleavage of the aromatic C–O bonds in lignin model compounds using supported metal catalysts in supercritical water without adding hydrogen gas and without causing hydrogenation of the aromatic rings. The cleavage of the C–C bond in bibenzyl was also achieved with Rh/C as a catalyst. Use of this technique may greatly facilitate the conversion of lignin into valuable aromatic compounds.

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EXAFS Study on Structural Change of Charcoal-supported Ruthenium Catalysts during Lignin Gasification in Supercritical Water

Cited by 36 publications

References 19 publications

Characterization of a Spent Ru/C Catalyst after Gasification of Biomass in Supercritical Water

Characterization of a Spent Ru/C Catalyst after Gasification of Biomass in Supercritical Water

Gaseous Fuel Production from Nonrecyclable Paper Wastes by Using Supported Metal Catalysts in High‐Temperature Liquid Water

Bond cleavage of lignin model compounds into aromatic monomers using supported metal catalysts in supercritical water

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