oilsTable 2 summarizes the other properties of heavy oils. Theirboiling point ranges were between 26 and 324◦C, while their density was changed in the range of 0.782–0.848 g/cm3. Both boilingpoint ranges and densities of pyrolysis oils well demonstrated that higher portion of components with lower molecular weights was in pyrolysis oil not only with decreasing MPW/HO ratios, but alsoin the presence of any catalysts. E.g., the density of pyrolysis oil was 0.848, 0.845 and 0.841 g/cm3 using 100/0, 70/30 and 30/70MPW/HO ratios without catalyst, respectively. Furthermore thedensities of thermo-catalytic derived pyrolysis oils were in therange of 0.782–0.828 g/cm3