fuel composition and pyrolysis rate settting
 

I am doing a research descibed as following. A liquid fuel (contains C¡BH¡BN¡BS¡BO) and gaseous oxygen are injected in a high temperature container. And then liquid fuel decomposes CH4,CO,CO2,H2,C,H2O at a pyrolysis rate. To proceed they react with oxygen. I don't know how to define the composition of the fuel and set pyrolysis rate.Please give me the guide.