| 초록 |
Hydrogen production by steam reforming of methanol was studied over Cu/Zn-based catalysts. Cu/Zn-based catalysts were derived from hydrotalcite-like precursors prepared by co-precipitation method. The catalysts were characterized by N2O chemisorption, XRD, and BET surface area measurements. It was revealed that ZrO2 added to Cu/Zn-based catalyst favorably served in enhancing copper dispersion on the catalyst surface. Among the catalysts tested, Cu/ZnO/ZrO2/Al2O3 catalyst exhibited the highest methanol conversion and the lowest CO concentration in the outlet gas. A micro-channel reactor coated with Cu/ZnO/ZrO2/Al2O3 catalyst in the presence of undercoated Al2O3 buffer layer showed higher methanol conversion and lower CO concentration in the outlet gas than that in the absence of undercoated Al2O3 buffer layer. The micro-channel reactor with undercoated Al2O3 buffer layer produced large amounts of hydrogen compared to the one without buffer layer. The undercoated Al2O3 buffer layer enhanced the adhesion between catalysts and micro-channel walls, leading to improvement of reactor performance. |
