Integrated plastics pyrolysis and plasma-catalysis reforming for H2 production
Converting waste plastics into usable energy or fuel can alleviate the problems caused by increasing plastic waste and decreasing fossil energy.An integrated pyrolysis and plasma-catalysis reforming system was proposed for hydrogen production from plastics.The product distribution from different plastics[e.g.high-density polyethylene(HDPE),polypropylene(PP)and polystyrene(PS)]was explored under four different reforming modes(heating-alone,catalytic-alone,plasma-alone and plasma-catalysis).The experiments were carried out in a two-stage fixed-bed reactor embedded with a coaxial dielectric blocking discharge(DBD)plasma zone.Comparing heating-alone mode,plasma-alone and catalysis-alone reforming modes promoted hydrocarbon cracking and increased gas yields,especially for H2.Plasma-catalysis reforming mode significantly increased the total gas and H2 yields from three plastics,and H2 selectivity of HDPE was the highest(66.44％).Characterisation of used catalysts revealed that the severity of catalyst sintering due to carbon deposition and pore blockage on the catalysts was in the following order:HDPE＞PP＞PS.The plasma discharge could improve the carbon deposition and metal phase aggregation problems on the catalyst surface,increase the specific surface area and pore volume of the catalysts,and reduce the average pore size.Therefore,the integrated pyrolysis and plasma-catalysis reforming system provided an effective reference solution for the optimization of energy production from plastic resources and supported the commercial application of the process.
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