In this work, the prospect of producing hydrogen (H-2) via ammonia (NH3) decomposition was evaluated in an experimental stand-alone microchannel reactor wash-coated with a commercial Ruthenium-based catalyst. The reactor performance was investigated under atmospheric pressure as a function of reaction temperature (723-873 K) and gas-hourly-space-velocity (65.2-326.1 Nl g(cat)(-1) h(-1)). Ammonia conversion of 99.8% was demonstrated at 326.1 Nl g(cat)(-1) h(-1) and 873 K. The H-2 produced at this operating condition was sufficient to yield an estimated fuel cell power output of 60 We and power density of 164 kW(e) L-1. Overall, the microchannel reactor considered here outperformed the Ni-based micro-structured system used in our previous work. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.