期刊
CHEMICAL ENGINEERING JOURNAL
卷 388, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124292
关键词
Supercritical water; Nearcritical water; Catalytic gasification; Sewage sludge; Hydrogen production
资金
- Basic Science Center Program for Order-ised Energy Conversion (OEC) of the National Natural Science Foundation of China [51888103]
Catalytic gasification of activated sewage sludge in nearcritical and supercritical water was researched in batch reactor. Different types of commercial catalysts including Ru/C, Raney-iron, Raney-cobalt and different types of Raney-nickel were used. Effects of catalyst type, reaction temperature (350 degrees C, 400 degrees C and 450 degrees C), residence time (5 min-25 min) and catalyst amount were investigated. Temperature was positive for hydrogen yield and Raney-nickel with Mo metal had better catalytic activity. The addition of Raney-nickel-Mo2 promoted the formation of hydrogen better. At 450 degrees C and 25 min, the maximum hydrogen yield reached to 18.13 mol/kg dry sludge with 1.4 g Raney-nickel-Mo2 catalyst/g dry sludge, and the maximum LHV, GE, CE and HYP achieved 14.3 MJ/Nm(3), 92%, 90.1% and 63.5 mol/kg dry sludge respectively. Although the compositions of two Raney-nickel with Mo were similar, Raney-nickel-Mo2 had better catalytic activity because it not only had the spongy structure but also it had larger specific area and better pore space concentration distribution.
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