Abstract
Abstract. The characteristics of the seaweed (SH) were investigated as a feedstock for slow pyrolysis and molten carbonate (MC) pyrolysis within the temperature range of 400°C to 600°C. SH differs from terrestrial biomass in its constitutional compounds and high N content. According to thermogravimetric analysis, decomposition of proteins and cellulose played the most important role in thermal degradation of SH. The yields and distributions of syngas and bio-oil from MC pyrolysis varied with temperature and were greatly different from those of slow pyrolysis. MC pyrolysis increased gas generation by 10.46 wt% while reducing solids yield from 38.10 wt% to 31.99 wt% at 600°C. Of the gaseous products, H2 was dominant, and CO2 was also prominent. Conversion of tar and acid in the bio-oil was significantly improved in the molten salts medium, while nitrogen content was significantly reduced in the bio-oil. MC pyrolysis minimized the obstacles to heat transfer during pyrolysis by heating the feedstock from both inside and outside. Keywords: Intensification, Molten carbonates, Pyrolysis, Sargassum horneri.
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