利用Cu/ZnO/Al2O3觸媒進行低溫甲醇產氫自熱反應之研究

Abstract

Abstract The autothermal reforming methanol reaction was carried out using Cu/ZnO/Al2O3 derivative, with oxalic co-precipitation method and wash coat precipitation method for running experiment on fixed bed reactor and microchannel reactor, respectively. All the operation condition that obtained optimized active catalysts at low reaction temperatures. The experimental conditions were used steam to methanol mol ratio, the mol ratio of oxygen to methanol, weight hourly space velocity, precipitation temperature on oxalic co-precipitation, pH on oxalic co-precipitation, time of drying on oxalic co-precipitation, various temperatures for heating up catalyst at initial condition, various temperatures on heating up catalyst and un-heating up catalyst, un-heating up catalyst and un-heating up reactant, various oxygen concentration on autothermal reforming methanol. The experiment result shows when use Cu/ZnO/Al2O3/Cr2O3/CeO2 (15/15/2.5/1.25/1.25 mol%) catalyst at the reaction temperature was lower (200 oC), methanol conversion equaled to 80% and carbon monoxide concentration equal to 900 ppm for lifetimes 100 h. Temperature of fixed bed catalyst is a function of x/L (length of fixed bed catalyst). An increased oxygen concentration has a correlation to increased temperature on catalyst bed. Increased temperature on catalyst bed has the significant effect for increased of methanol conversion. The experiment result when running on microchannel reactor was better than fixed bed reactor.