Journal
CHEMICAL ENGINEERING JOURNAL
Volume 288, Issue -, Pages 671-679Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.12.036
Keywords
Plasma catalysis; Warm plasma; Ni catalyst; Biogas reforming; Syngas
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Funding
- International Science & Technology Cooperation Program of China [2013DFG60060]
- National Natural Science Foundation of China [U1201231]
- Fundamental Research Funds for the Central Universities [DUT14RC(3)093]
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Highly efficient warm plasma catalytic reforming of biogas in a compact and heat-insulated reactor using gliding arc discharge with a co-axial electrode configuration and Ni-based catalyst was reported. The effect of inlet flow rate at a special energy input (SEI) of 20 kJ/mol for the plasma alone was first investigated and the inlet flow rate was selected at 4 SLM. Then, it was found that the Ni-based catalyst could be auto-reduced by the outgoing gas from the warm plasma via comparing with the pre-reduced catalyst in the reforming reaction testing and characterizations of Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The effect of catalyst-bed position (1) was also examined. Feeding with the molar ratio of CH4:CO2:O-2 = 3:2:1.8, for the warm plasma with the auto-reduced Ni/CeO2/Al2O3 catalyst located at l = 4 cm, dry-basis concentration of syngas rose substantially to 81% and energy efficiency improved dramatically to 86%. Syngas energy cost reduced significantly to 0.21 kW h/N m(3), which is nearly a threefold reduction compared with the plasma alone. The stability of the warm plasma catalytic reforming was preliminarily evaluated over time-on-stream (TOS) of 13.5 h. (C) 2015 Elsevier B.V. All rights reserved.
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