Abstract
Biomass conversion via pyrolysis has been regarded as a promising solution for bio-oil production. Compared to fossil fuels, however, the pyrolysis bio-oils from biomass are corrosive and unstable due to relatively high oxygen content. Thus, an upgrading of bio-oil is required to reduce O component while improving stability in order to use it directly as fuel sources or in industrial processes for synthesizing chemicals. The catalytic hydrodeoxygenation (HDO) is considered as one of the promising methods for upgrading pyrolysis bio-oil. In this research, the HDO was studied for various catalysts (HZSM-5, metal, and metal-phosphide catalysts) to improve the quality of bio-oil produced by fast pyrolysis of Saccharina japonica (SJ) in a fluidized-bed reactor. The HDO processing was carried out in an autoclave at 350 °C and different initial pressures (3, 6, and 15 bar). During HDO, the oxygen species in the bio-oil was removed primarily via formation of CO2 and H2O. Among the gases produced through HDO, CO2 was observed to be most abundant. The C/O ratio of produced bio-oil increased when CoMoP/γ-Al2O3, Co/γ-Al2O3, Fe/γ-Al2O3, or HZSM-5 was used. The Co/γ-Al2O3 resulted in higher HDO performance than other catalysts. The bio-oil upgraded with Co/γ-Al2O3 showed high HHV (34.41 MJ/kg). With the use of catalysts, the kerosene-diesel fraction (carbon number C12–C14) was increased from 36.17 to 38.62–48.92 wt.%.
Highlights
Biomass has attracted considerable attention as an alternative energy resource to replace nonrenewable fossil fuels
Catalysts 2019, 9, 1043 characteristics and kinetics of Saccharina japonica (SJ) alga and Sargassum sp. and found that the bio-oil produced at optimum conditions showed a higher heating value (HHV) of 31.9 MJ/kg and an O/C
The HDO process of Saccharina japonica bio-oil was systematically investigated in an autoclave reactor
Summary
Biomass has attracted considerable attention as an alternative energy resource to replace nonrenewable fossil fuels. Among the various resources for renewable energy, macroalgae offers great promise as feedstock for biofuel production due to its higher growth rate even in wastewater and seawater, higher yield, and shorter harvesting cycle, compared to terrestrial biomass. Thermal conversion via pyrolysis has received a lot of attention as a promising technique to produce biofuel from macroalgae. Found that the bio-oil produced at optimum conditions showed a higher heating value (HHV) of 31.9 MJ/kg and an O/C molar ratio of 0.16. Ly et al [5] produced bio-oils with HHVs in the range of 24.75–28.72 MJ/kg by fast pyrolysis of SJ. By pretreating Enteromorpha clathrata alga with diluted HCl, Cao et al [11] enhanced the yield of the bio-oil by 9.6%
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
