Improved steam gasification of lignocellulosic residues in a fluidized bed with commercial steam reforming catalysts

Aznar, María Pilar Matud; Corella, José; Delgado, Javier; Lahoz, Joaquin

doi:10.1021/ie00013a001

Cited by 133 publications

(99 citation statements)

References 16 publications

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“…In all sets of runs, through the effect of dolomitic catalyst and the humidity, it is observed for all atmospheres (air, N2 and O2/H2O) the reforming of the gas by the destruction of species C 3 -C 6 . The decrease in the concentration of tars is observed both with increasing ratio D/B and the moisture present in the reaction.…”

Section: Steam Combined Effectmentioning

confidence: 86%

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Gasification and pyrolysis of Posidonia oceanica in the presence of dolomite

Conesa

Domene

2015

Journal of Analytical and Applied Pyrolysis

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HIGHLIGHTS-Posidonia oceanica thermal decomposition is studied. -Combustion, pyrolysis and gasification at different experimental conditions are performed.-The combined effect of the presence of oxygen, air, water vapor and dolomite in the decomposition bed is analysed. -Conditions where maximum ratio H 2 /CO is observed are optimized. ABSTRACTIn the present work, a very detailed study of the reforming of syngas produced in the decomposition of Posidonia oceanica is done. The effect of the presence of different amounts of dolomite is analysed. Also pyrolysis is studied, in nitrogen atmosphere, and gasification in the presence of air, oxygen and different amounts of steam. A detailed discussion on formation and destruction of tars is done. Furthermore, the effect of the heating rate in the decomposition and the residence time of the evolved gases are discussed. Syngas with ratio H 2 /CO from 0.3 to ca. 3 can be obtained from this interesting material. Marine species (microalgae) are usually studied with the aim of cultivate them for gas or oil production, but in this paper we draw attention to the possibility of using a natural resource with a very small impact in the ecosystem.

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Section: Steam Combined Effectmentioning

confidence: 86%

“…For a complete reforming it is usual to use a dual reactor configuration, with a primary catalyst dolomite bed where tar levels are reduced to acceptable levels, and if necessary, a second catalyst in introduced to treat the effluent stream, usually Ni catalysts [6]. Adding olivine and Ce2O improves the action of the catalyst Ni [5].…”

Section: Introductionmentioning

confidence: 99%

Gasification and pyrolysis of Posidonia oceanica in the presence of dolomite

Conesa

Domene

2015

Journal of Analytical and Applied Pyrolysis

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“…77 The important reactions that occur in supercritical water are the same as those that occur in gasification, including pyrolysis, hydrolysis, steam reforming, WGS, and methanation. 78 Supercritical gasification appears to be a unique technology, which will require further development. Some areas of future research include the development of highly active, stable, and selective novel catalysts, reaction chemistry studies, and reactor designs.…”

Section: Supercritical Gasificationmentioning

confidence: 99%

Synthesis of Transportation Fuels from Biomass: Chemistry, Catalysts, and Engineering

2006

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“…Of these, catalytic approach is the most promising alternative to destroy tar compounds since it can convert tar to gaseous fuels at moderate temperatures. Several different catalytic materials have been tested for biomass tar destruction, including dolomite, nickel and cobalt based catalysts (3)(4)(5)(6)(7)(8). The rapid deactivation of catalysts in the fuel gas presents a major challenge.…”

Section: Introductionmentioning

confidence: 99%

Stability and Regeneration of Catalysts for the Destruction of Tars from Bio-mass Black Liquor Gasification

Agrawal¹

2004

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The goal of this project was to develop catalytic materials and processes that would be effective in the destruction of tars formed during the gasification of black liquor and biomass. We report here the significant results obtained at the conclusion of this two year project. A one year no-cost extension of this project was requested and approved. Task 1.Was completed. We identified Group VIII transition metal catalysts as active for the gasification of benzene (model tar compound) using steam. These catalysts, however, don't have any sulfur tolerance. We have identified Group VI B sulfide materials such as tungsten sulfide or CobaltMolybdenum sulfides as active catalysts for the reaction, and with good tolerance towards sulfur.Task 2. ThermoChem. Inc. and Kellogg Brown Root were identified as potential partners for the industrial site pilot reactor studies. However, no pilot scale work could be done because their gasification reactors didn't come on stream which was a necessary step before we could go and perform the pilot scale reactor testing of the chosen catalysts. However, all the pieces and designs were completed to carry out such studies.Task 3. Was completed. It involved characterization of aged catalysts. X-ray diffraction studies showed that Group VIII transition metal catalysts lost their activity in the presence of sulfur, due to the formation of sulfide and sulfate phases. Also complex phase transformations were observed in the presence of alkali compounds.Task 4. Was completed. The goal was to develop effective regeneration methods. It was found that sulfur-poisoned Group VIII transition metal catalysts could not be regenerated using oxidation or steam treatments at elevated temperatures. Our efforts focused instead on the regeneration of carbondeactivated catalysts. The efforts to regenerate Co-Mo catalysts using oxidation treatment were successful in removing carbon. The resulting material was subsequently sulfided. It was possible to achieve original catalytic activity even after three weeks of aging.With the exception of pilot scale testing of the chosen catalysts, all other objectives for the project were completed.3

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Improved steam gasification of lignocellulosic residues in a fluidized bed with commercial steam reforming catalysts

Cited by 133 publications

References 16 publications

Gasification and pyrolysis of Posidonia oceanica in the presence of dolomite

Gasification and pyrolysis of Posidonia oceanica in the presence of dolomite

Synthesis of Transportation Fuels from Biomass: Chemistry, Catalysts, and Engineering

Stability and Regeneration of Catalysts for the Destruction of Tars from Bio-mass Black Liquor Gasification

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