| 초록 |
Biomass is a renewable and an important alternative resource of fossile fuel. The gasification of biomass such as wood and sewage sludge has been studied under high temperature (500-1000(C) to prepare a synthetic gas.1) During gasification, mainly CO, CO2 and H2 are produced as main products.2) Methanol which is a key material for C1 chemistry can be synthesized from these gas mixtures. Cu/ZnO-based catalysts are generally used for this reaction.3) Methanol is conventionally produced in gas-phase systems from a feedstock consisting of CO/CO2/H2 over a Cu/ZnO/Al2O3 catalyst. Its alternative, a three-phase process was proposed in the late 1970s in order to use the CO-rich syngas which derives from coal gasification.4) The mechanism of gas-phase catalytic hydrogenation of CO2 and CO are accompanied by the water gas shift reaction (WGSR). Thus, it is believed that CO2 is the primary source of methanol production with CO-CO2-H2 feedstock, while the role of CO is to remove the oxygen adsorbed on the catalystsurface, which results on a reaction between CO2 and H2. Some reports have been cited on the simultaneous production of methanol from CO or CO2 hydrogenation over Cu/ZnO/Al2O3 catalysts, that is, combination of methanol synthesis and Cu/ZnO/Al2O3 catalysts.5) In the present work, we have been tried to develop one-step process of the MeOH production from CO/CO2/H2 bio syngas using a Cu/ZnO/Al2O3 system. The effect of feed gas composition on the MeOH production and the effect of temperature on the product yields and selectivities were investigated. |
