In situ and Ex situ Catalytic Pyrolysis of Microalgae and Integration With Pyrolytic Fractionation.

摘要: Microalgae are attractive feedstocks for biofuel production and especially suitable thermochemical conversion due to the presence of thermally labile constituents-lipids, starch protein. However, thermal degradation proteins produces water as well other O- N-compounds that mixed-in with energy-dense lipid pyrolysis products. To produce hydrocarbon-rich products from microalgae biomass, we assessed in situ ex catalytic a lipid-rich Chlorella sp. HZSM-5 zeolite catalyst over temperature range 450-550°C. Results show product yields compositions were similar under both conditions benzene, toluene xylene produced primary aromatic Yields aromatics increased increasing highest yield (36.4% g aromatics/g ash-free microalgae) selectivity (87% bio-oil) was obtained at 550°C. Also, this temperature, oxygenates nitrogenous compounds not detected among liquid during pyrolysis. We also feasibility two-step fractional approach integrated vapor phase upgrading. In these experiments, biomass first pyrolyzed 320°C degrade volatilize starch, protein free fatty acids. Then, residual again 450°C recover triglyceride decomposition. The volatiles each fraction passed through an bed. showed net 2-step process single step indicating tailored upgrading can be applied allow separate recovery chemically distinct components-(1) lower calorific value (2) lipids.