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Characteristics of Hydrogen Production by Catalytic Pyrolysis of Plastics and Biomass  

Choi, Sun-Yong (Research Institute of Energy and Environment, Seoul National University of Science & Technology)
Lee, Moon-Won (Seoul National University of Science & Technology)
Hwang, Hoon (Seoul National University of Science & Technology)
Kim, Lae-Hyun (Seoul National University of Science & Technology)
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Abstract
In this study, we consider gas generation characteristics on pyrolysis of eco-fuel which were made by mixing of Pitch Pine and Lauan sawdust as biomass and polyethylene, polypropylene, polystyrene as municipal plastic wastes with catalyst in fixed bed reactor. From the result of higher heating value(HHV) measurement and of ultimate analysis, the heating value of plastic wastes and a hydrogen content in plastic sample are higher than biomass. An activation energy was reduced by a catalyst addition. However the catalyst content influence over 5 wt% was insignificant. The yield of hydrogen from gasification of biomass containing plastic wastes such as polyethylene, polypropylene and polystyrene were obtained higher than that of sole biomass. The high temperature and mixture ratio of catalyst conditions induced to high hydrogen yield in most of the samples. As the influence of catalyst, the hydrogen yield by catalytic reaction was higher than non-catalytic reaction. We confirmed that Ni-$ZrO_2$ catalyst is more active in increasing the hydrogen yield in comparison with that of carbonate catalyst. The maximum hydrogen yield was 65.9 vol.%(Pitch Pine / polypropylene / 20 wt.% Ni-$ZrO_2$(1:9) at $900^{\circ}C$).
Keywords
Hydrogen; Biomass; Plastic Waste; Pyrolysis; Gasification;
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