کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5134676 | 1492951 | 2017 | 9 صفحه PDF | دانلود رایگان |
- Aromatic bio-oil isolated from ZSM-5 catalytic pyrolysis of spirulina.
- Had a high C content, fully deoxygenated, partially denitrogenated.
- Burnt homogeneously with a sooting flame then heterogeneously as cenosphere.
- Biochar/coke retained 60% carbon, fixed N can replenish almost half initial nutrient.
- 20% proposed as the maximum energy recovery to obtain a petrol-like algal biofuel.
Spirulina (Arthrospira platensis) was cultivated in a 70 L indoor vertical photobioreactor and harvested at concentrations of 1.0 g Lâ1 dry biomass. Lyophilised algal biomass was pyrolysed at 500 °C under nitrogen and vapours were passed over pelletised HZSM5- zeolite (SiO2/Al2O3 38). An organic fraction (bio-oil) overlaying an aqueous phase was obtained by cold trapping, while non-condensed bio-oil components (XAD fraction) were adsorbed onto a poly(styrene-co-divinylbenzene) resin. About 20% of the original algal carbon was converted into inorganic carbon in the aqueous (HCO3â/CO32â) and gas phase (composed of 70% CO2, 20% CO). Most of spirulina carbon ended up in char (30%) and coke (30%). Bio-oil and XAD fraction represented approximately 10% mass, 20% carbon and 20% energy of algal biomass. Bio-oil composition was dominated by alkylated monoaromatic hydrocarbons, with benzene concentrations below 10 g kgâ1. Large part of original nitrogen was dissolved in the aqueous phase (40%) and incorporated into char/coke (37%). A minor fraction (6%) of nitrogen ended up in bio-oil in the form of indoles, pyrroles, carbazoles, anilines. While deoxygenation was effective, denitrogenation was incomplete and probably counteracted by zeolite ammonisation. Microcombustion experiments showed that the bio-oil burnt efficiently, but with a sooting flame, and a tendency to form small solid carbonaceous residues probably associated with the presence of heavy compounds.
Journal: Journal of Analytical and Applied Pyrolysis - Volume 126, July 2017, Pages 230-238