In this work, the decomposition behaviors of mainly jatropha seed cake have been examined for desired liquid organic hydrocarbons. In order to check liquid product yield, thermogravimetric (TG) and differential thermogravimetric (DTG) analyses of jatropha wastes were first carried out. The data investigation shows little difference in the value of weight loss between jatropha seed cake and seed shell. The weight loss approximately remains unchanged by the presence of H-ZSM-5 catalysts, but distributions of liquid products formed during pyrolysis, which were examined by Py-GC/MS analysis, were dramatically changed. In fact, the pyrograms obtained in the presence of catalyst at 550 degrees C were found to be aromatic hydrocarbon selectivity above 90% with the nitrogen-containing compounds of only 2.3%, while, with no catalyst, widely ranged organic products were formed. In the catalytic pyrolysis using quartz reactor, however, the selectivity to aromatic hydrocarbons is only 12.2%, while the N-compounds are 33.9%. Not only the increase in aromatic selectivity, but also the decrease in selectivity to N-compounds would be closely related to both acidity and pore structure of catalyst materials such as H-ZSM-5 and beta-zeolite. The postulated reaction pathway was proposed, in order to explain the formation of N-containing compounds as well as aromatic hydrocarbons.