The major chemical pathways for production of aromatic hydrocarbons in the pyrolysis and subsequent ยฏaming combustion of biomass materials are high temperature secondary reactions of the primary pyrolysis products. The second and less explored route is the evolution of aromatics from the solid substrate in the temperature range of 400ยฑ6008C. Primary chars that form around 300ยฑ4008C, depending on the starting material, continue to undergo pyrolysis up to temperatures of 6008C and higher. In this work, the formation of aromatic hydrocarbons from the second route was investigated for cellulosic materials. Experimental work was performed primarily using TG/DSC/MS. In order to reduce the formation of hydrocarbons from secondary reactions of the primary pyrolysis products, small sample size, i.e., 2 ยฑ10 mg, and a high helium ยฏow rate of 150 ml/min, were used. Heating rates of less than 608C /Min were used to ensure uniform sample temperature. Py/ GC/MS conยฎrmed the identities and relative quantities of masses detected by TG/DSC/MS. Under slow heating conditions, which are typical of thermogravimetric analyzers, simple hydrocarbon products begin to evolve above 3508C, where the primary decomposition of cellulosic materials has completed and the remaining char has begun the carbonization/aromatization process. Most aromatic products such as benzene, toluene, naphthalene, anthracene are detected between 400 to 6008C. Detectable products formed at temperatures above 6008C are methane, benzene, and hydrogen, and carbon monoxide. Some kinetic parameters for the formation of hydrocarbon products are deduced from the experimental ยฎndings and discussed in this presentation.