Journal
CHEMICAL ENGINEERING SCIENCE
Volume 205, Issue -, Pages 341-349Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2019.05.009
Keywords
Composite catalysts; Pressure gasification; Steam gasification; Gas composition
Categories
Funding
- National Science Foundation of China [21676289]
- Youth Innovation Promotion Association [2014156]
- CAS/SAFEA International Partnership Program for Creative Research Teams
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The effects of temperature, pressure, steam ratio and K-based composite catalysts on the pressurized steam gasification of sawdust char were studied and the physicochemical structure of composite catalysts was characterized in detail. The results indicated that steam promoted the production of hydrogen but suppressed that of CH4. The generation of CH4 required high pressure, low temperature and suitable steam atmosphere. The composite catalysts reduced the reaction temperature and increased the carbon conversion, theirs catalytic performance ranked in descending order was KCe > KCo > KFe > KNi, where KCe showed perfect catalytic performance, which mainly determined by the ability to activate carbon during pressurized steam gasification of char. KFe and KCo were more conducive to water-gas-shift reaction, while KNi had the better performance on gasification reaction. The transformation paths of the composite catalysts were as follows: Ce(NO3)(3)center dot 6H(2)O -> CeO2, Co(NO3)(2)center dot 6H(2)O -> CoO/Co3O4 -> Co -> CoO, Fe (NO3)(3)center dot 9H(2)O -> Fe2O3 -> FeO -> Fe3O4 and Ni(NO3)(2)center dot 6H(2)O -> NiO -> Ni. (C) 2019 Published by Elsevier Ltd.
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