Reforming of aqueous wood pyrolysis condensate in supercritical water

Penninger, J. M. L.; Rep, M.

doi:10.1016/j.ijhydene.2006.06.027

Cited by 49 publications

(50 citation statements)

References 2 publications

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“…Minerals contained in the feed can be concentrated in the char produced by two-step processing. In the first step, the feed is flash pyrolized, and in the second step, the condensate is fed to the reactor, in which the gasification in supercritical water is carried out [175,176]. At T ¼ 600-650 C, P ¼ 28 MPa, a gasification efficiency of 60-80% is obtained in a tubular reactor made of Incoloy with H 2 , CH 4 , CO, and CO 2 as major products.…”

Section: Overview On Gasification Of Biomass With Watermentioning

confidence: 99%

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Processing of Biomass with Hydrothermal and Supercritical Water

Brunner¹

2014

Supercritical Fluid Science and Technology

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Section: Overview On Gasification Of Biomass With Watermentioning

confidence: 99%

“…For examples, the reader is referred to the following publications [163,167,175,176,178,[183][184][185]. Organic materials can be gasified efficiently in supercritical water.…”

Section: Gasification Of Black Liquormentioning

confidence: 99%

Processing of Biomass with Hydrothermal and Supercritical Water

Brunner¹

2014

Supercritical Fluid Science and Technology

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“…Rep [15] have reported the SCWG of aqueous wood condensate in a tubular flow reactor. The reaction, which was carried out 650 °C and 28 MPa, gave a hydrogen-rich gas and resulted in about 90% carbon gasification.…”

Section: Introductionmentioning

confidence: 99%

“…All these reported cases involved using aqueous-phase fractions with low concentrations e.g. 0.65 -3.1 wt% TOC [13], 4 wt% organic [15], 1 % TOC [16] and 5 wt% [17]. They also showed that attempts to increase feed concentrations resulted in poor conversion difficulties due to tar formation, reactor pulling and clogging of the pump outlets during continuous operation.…”

Section: Introductionmentioning

confidence: 99%

Catalytic conversion of bio-oil in supercritical water: Influence of RuO2/γ-Al2O3 catalysts on gasification efficiencies and bio-methane production

Onwudili

Williams

2016

Applied Catalysis B: Environmental

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Catalytic supercritical water gasification of heavy (dewatered) bio-oil has been investigated in a batch reactor in the presence of ruthenium catalysts in the form of RuO 2 on -Al 2 O 3 support. The reactions were carried out at temperatures of 400 °C, 450 °C and 500 °C and reaction times of up to 60 min using 15 wt% of bio-oil feed. Increased ruthenium oxide loading led to increased carbon gasification efficiencies (CGE) and bio-methane production.Hence, using the 20 wt% RuO 2 / -Al 2 O 3 catalyst, CGE was 97.4 wt% at 500 °C and methane yield reached nearly 30 wt% of the bio-oil feed, which gave a CH 4 /CO 2 molar ratio of 1.28.There was evidence that the RuO 2 was involved in the initial conversion of the bio-oil to carbon oxides and hydrogen as well as the reduction of the CO 2 to methane via CO methanation. However, competition for CO consumption via the water-gas shift reaction was also possible due to the large presence of water as the reaction medium. This work therefore demonstrates that high concentrations of heavy fraction of bio-oil can be catalytically converted to a methane-rich gas product under hydrothermal conditions at moderate temperatures. The calorific values of the gas product reached up to 54 MJ.kg -1 , which is nearly 3 times the HHV of the bio-oil feed.

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“…This latter indicates that more insight should be gained for the scale-up and commercialisation of this emerging technology. Specifically, Penninger and Rep [12] analysed the supercritical water reforming of bio-oil for H 2 production, while Onwudili and Williams [13] studied the supercritical water gasification for the production of CH 4 . Remón et al [10] investigated the use of water in sub-and supercritical state for bio-oil valorisation using a Ni catalyst supported on alumina prepared by coprecipitation (Ni-Co/Al-Mg).…”

Section: Introductionmentioning

confidence: 99%

Bio-oil upgrading in supercritical water using Ni-Co catalysts supported on carbon nanofibres

Remón

Arauzo

García

et al. 2016

Fuel Processing Technology

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This work addresses the preparation, characterisation and screening of different Ni-Co catalysts supported on carbon nanofibres (CNFs) for use in the upgrading of bio-oil in supercritical water. The aim is to improve the physicochemical properties of bio-oil so that it can be used as a fuel. The CNFs were firstly oxidised in HNO 3 and afterwards subjected to a thermal treatment to selectively modify their surface chemistry prior to the incorporation of the metal active phase (Ni-Co). The CNFs and the supported catalysts were thoroughly characterised by several techniques, which allowed a relationship to be established between the catalyst properties and the upgrading results.The use of Ni-Co/CNFs for bio-oil upgrading in supercritical water (SCW) significantly improved the properties of the original feedstock. In addition, the thermal treatment to which the fibres were subjected exerted a significant influence on their catalyticproperties. An increase in the severity of the thermal treatment led to a substantial reduction in the oxygen content of the CNFs, mainly due to the removal of the less 2 stable oxygen surface groups, which allowed their surface polarity to decrease. This decrease resulted in less formation of solid products. However, it also reduced the H/C and increased the O/C ratios of the upgraded liquid. Therefore, a compromise between the yield and the properties of the upgraded bio-oil was achieved with a Ni-Co supported on a CNF with a moderate amount of oxygen surface groups.

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Reforming of aqueous wood pyrolysis condensate in supercritical water

Cited by 49 publications

References 2 publications

Processing of Biomass with Hydrothermal and Supercritical Water

Processing of Biomass with Hydrothermal and Supercritical Water

Catalytic conversion of bio-oil in supercritical water: Influence of RuO2/γ-Al2O3 catalysts on gasification efficiencies and bio-methane production

Bio-oil upgrading in supercritical water using Ni-Co catalysts supported on carbon nanofibres

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