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Hydrothermal catalytic gasification of fermentation residues from a biogas plant.
- Source :
-
Biomass & Bioenergy . Jun2013, Vol. 53, p138-148. 11p. - Publication Year :
- 2013
-
Abstract
- Biogas plants, increasing in number, produce a stream of fermentation residue with high organic content, providing an energy source which is by now mostly unused. We tested this biomass as a potential feedstock for catalytic gasification in supercritical water (T ≥374°C, p ≥22MPa) for methane production using a batch reactor system. The coke formation tendency during the heat-up phase was evaluated as well as the cleavage of biomass-bound sulfur with respect to its removal from the process as a salt. We found that sulfur is not sufficiently released from the biomass during heating up to a temperature of 410°C. Addition of alkali salts improved the liquefaction of fermentation residues with a low content of minerals, probably by buffering the pH. We found a deactivation of the carbon-supported ruthenium catalyst at low catalyst-to-biomass loadings, which we attribute to sulfur poisoning and fouling in accordance with the composition of the fermentation residue. A temperature of 400°C was found to maximize the methane yield. A residence time dependent biomass to catalyst ratio of 0.45gg−1 h−1 was found to result in nearly full conversion with the Ru/C catalyst. A Ru/ZrO2 catalyst, tested under similar conditions, was less active. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09619534
- Volume :
- 53
- Database :
- Academic Search Index
- Journal :
- Biomass & Bioenergy
- Publication Type :
- Academic Journal
- Accession number :
- 89275442
- Full Text :
- https://doi.org/10.1016/j.biombioe.2012.12.030