Pyrolysis is the thermal decomposition of materials in the absence of oxygen or when significantly less oxygen is present than required for complete combustion (Mohan et al., 2006) shown in Fig. 1. This very complicated process consists of both coincident and consecutive reactions. The long chains of carbon, hydrogen and oxygen compounds in biomass break down into smaller molecules in the form of gases, condensable vapors (tars and oils) and solid charcoal under pyrolysis conditions. Rate and extent of decomposition of each of these components depend on the process parameters of the reactor (pyrolysis) temperature, biomass heating rate, pressure, reactor configuration, feedstock (Jahirul et al., 2012). There are generally two types of pyrolysis techniques: slow pyrolysis and fast pyrolysis, with regards to the heating rate (Vamvuka, 2011). The typical product of pyrolysis process is shown in Fig. 2.