The reforming of methanol is usually carried out by a catalytic process. In this study, a single-stage, non-catalytic, methanol pyrolysis and reforming, process for producing mainly hydrogen using an atmospheric-pressure microwave plasma reactor is demonstrated. When the applied power was elevated from 800 to 1400 W, the selectivity of H(2) increased from 77.5% to 85.8% at inlet molar fraction of MeOH = 3.3%. The selectivities of carbon-containing byproducts were in the order: CO > carbon black > C(2)H(2) > CH(4) > CO(2) similar to C(2)H(4). In addition, a higher conversion of methanol with a higher selectivity of H(2) was achieved at a higher applied power. While a low required energy consumption of H(2) (13.2 eV/molecule-H(2)) was obtained at a low applied power (800 W) and a higher inlet concentration of methanol (5.0%). (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.