For protable devices,fuel cells have been a competitive candidate as a microscale power source and methanol is a suitable liquid fuel for producing hydrogen because of its high production capacity and easy handling.Partial Oxidation of Methanol has the advantages of being a quick initiation and no heat supply as the reaction reaches steady-state,and is a competitive approach to producing hydrogen for exchange membrane fuel cells (PEMFCs).For manufacturing a high-efficiency methanol refroming micro-reactor,one important factor is catalyst coating quality in the micro-channel.Wash-coating has been the most common technique and boehmite or bentonite is widely used as binder[1-5].Other inorganic sol is often used as binder as well[6].In our previous study,we had tried different methods for catalyst coating in microchannel,including sol-gel method with catalyst precursors,slurry method with ready-made catalysts and boehmite as binder.The former has the advantages that the catalyst solution can be infiltrated into microchannels with smaller channel size,which means better gas-solid contact,but we found the adhesion between catalyst and the internal wall of microchannel is poor.The latter use optimized catalyst for coating,but the inorganic binder covers some active sites of the catalyst and seriously affect the performance.In the present study,we develop a simple method for coating catalyst in micro-channel.We use polyvinyl alcohol (PVA) as dispersant as well as binder to prepare the catalyst slurry.The catalyst slurry was composed of 10 wt.% CuMnZnO catalyst synthesized in our lab,1 wt.% PVA in D.I.water,stirred for 24 hr.When wash-coated on silicon wafer,the catalyst slurry forms an uniform film in comparison to that without PVA,which has many cracks and adheres poorly to the substrate.In our test,the slurry can be easily loaded into micro-channel and has uniform coating.The other advantage of PVA is that it could be burnt off under 400℃ and will not affect the activity of catalyst.Porous silicon is also made on the inner surface of micro-channel to improve the adhesion of catalyst to the micro-channel and increase the surface area.We have redesigned the micro-reactor and the activity test will be accomplished in the near future.