Thermogravimetric analysis of biomass decomposition has been carried out in different atmospheres and in the presence of different primary catalysts. The main focus of the research has been on the identification and quantification of the products of biomass gasification and pyrolysis according to their functional groups as a function of the temperature and time of evolution. This would enable the identification of volatiles evolved at low temperatures and and investigate the feasibility of using these volatiles to make useful products. The gases have been analysed by gas chromatography and fourier transform IR spectroscopy and the liquid products have been analysed by a GC/MS. The effect of different primary and secondary catalysts in altering product composition and yields are also discussed.