Catalytic supercritical water gasification: Interaction of sulfur with ZnO and the ruthenium catalyst

Continuous catalytic supercritical water gasification (CSCWG; 400 degrees C, 28 MPa) of microalgal biomass (Chlorella vulgaris) was carried out at the microalgae production site of ZHAW in Wadenswil (Switzerland) non-stop over a period of 100 h. Characterization of the spent catalyst showed that mainly sulfur poisoning, and to a lesser extent coking, salt deposits, and some sintering of the Ru nanoparticles were responsible for the deactivation of the catalyst after 55 h of time on-stream. The commercial zinc oxide adsorbent exhibited a high mechanical stability and good sulfur adsorption performance under supercritical water conditions although its specific surface area collapsed. In summary, the use of a zinc oxide adsorbent upstream of the catalyst bed, together with a higher ruthenium loading of the catalyst, improved the long-term performance of the CSCWG process significantly. (C) 2016 Elsevier B.V. All rights reserved.


Published in:
Applied Catalysis B: Environmental, 202, 262-268
Year:
2017
Publisher:
Amsterdam, Elsevier
ISSN:
0926-3373
Keywords:
Laboratories:




 Record created 2016-12-21, last modified 2018-12-03


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