Microalgae (Dunaliella tertiolecta) are considered potential feedstock for production of biodiesel and bioethanol due to their high lipid and carbohydrate contents. To achieve complete utilization of microalgae in a microalgae biorefinery, residual biomass after conversion of lipids and carbohydrates into biodiesel and bioethanol can be converted into bio-oils by pyrolysis. D. tertiolecta residual biomass decomposed mainly between 200 degrees C and 550 degrees C at heating rates of 5-20 degrees C/min. The apparent activation energy increased from 163.12 kJ mol(-1) to 670.24 kJ mol(-1) with increasing pyrolysis conversion. Experimental results were consistent with the proposed lumped kinetic model, and the kinetic rate constant for D. tertiolecta residual -> bio-oil (k(2)) was the highest. This result indicates that the predominant reaction pathway of D. tertiolecta residual was A (D. tertiolecta residual) to B (bio-oil), rather than A (D. tertiolecta residual) to C (gas; C-1-C-4, CO, CO2, H-2) or B (bio-oil) to C (gas; C-1-C-4, CO, CO2, H-2). (C) 2014 Elsevier B.V. All rights reserved.