In this work biomass wastes, consisting of rapeseed oil cakes (RSOC) and walnut shells (WS), was subjected to pyrolysis process in a fluidized bed reactor, using various pyrolysis carrier gases ( N2, CO2, CH4, CO). The effects of pyrolysis atmosphere on composition and yields were analyzed. Results showed that using CH4 atmosphere was achieved highest liquid yield (59.7%), followed by N2, CO2 and CO2 atmospheres (57.3%, 55.6% and 49.7 %, respectively). Also, CO atmosphere has converted more O2 compounds into water and CO2. Oil analysis showed that all gas atmospheres lead to oil products having more mono-functional phenol groups. The density of oil produced for all gaseous atmospheres was >1.0 kg/dm3 and the pH value > 3.5. By collecting oil fractions obtained under different atmospheres and their mixing resulted an oil with high heating value (HHV) of 25.8MJ/kg , for RSOC, while for WS this was 23.9 MJ/kg, respectively. The main gaseous components in the non – condensable gas fraction are CO2, CO and CH4. This experimental results lead to the idea that the gaseous product resulted could be used as carrier gas in pyrolysis process, by its recycling in reactor, leading to lower costs in application of such a process.

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