Liwei Pan

Effects of precipitation aging time on the performance of CuO/ZnO/CeO2-ZrO2 for methanol steam reforming

Abstract CuO/ZnO/CeO 2 -ZrO 2 catalysts for methanol steam reforming (MSR) were prepared by a co-precipitation procedure, and the effects of precipitation aging time on the catalytic performance were investigated. It was found that the prolonged precipitation aging time increased the surface Cu atoms and improved the reducibility of catalyst, but decreased the oxygen storage capacity. A nearly linear increase between the surface Cu atoms and H 2 production rate was obtained in prepared CuO/ZnO/CeO 2 -ZrO 2 catalysts with prolonged precipitation aging time. However, CO concentration increased with the decrease of the oxygen storage capacity. Considering the H 2 production rate and CO level, the optimal precipitation aging time was 2 h. CuO/ZnO/CeO 2 -ZrO 2 prepared using this aging time exhibited the best activity with suppressed CO formation.

Effect of precursor and precipitant concentrations on the catalytic properties of CuO/ZnO/CeO2-ZrO2 for methanol steam reforming

Abstract A series of CuO/ZnO/CeO 2 -ZrO 2 catalysts for methanol steam reforming was prepared by the co-precipitation method, and the effect of precursor and precipitant concentrations on the catalytic properties was investigated. All the catalysts were characterized by N 2 adsorption, XRD, H 2 -TPR and XPS techniques. It was shown that the precursor and precipitant concentrations remarkably influenced the catalyst structure and property. When the precursor and precipitant concentrations were 0.1 mol/L and 0.5 mol/L respectively, the catalyst exhibited the highest activity and the lowest CO selectivity. Within 360 h, the highest methanol conversion reached 100% with H 2 concentration higher than 74.5% and CO concentration lower than 0.8% in the reforming gas, showing that the catalyst has excellent catalytic stability.

Study of methane autothermal reforming catalyst

The effects of Ce-ZrOx, Ce-LaOx, Ce-SmOx and Ce-GdOx additions to Rh/Al2O3 catalysts on methane autothermal re-forming were investigated. Activity tests showed that the addition of Ce-ZrOx could significantly reduce the concentration of CO in reformats. When Ce/Zr atomic ratio was 1:1, Ce0.5Zr0.5O2 solid solution with high thermal stability was obtained, which could effectively improve the catalytic performance effectively. The additives of alkaline-earth metals (Mg, K and Ca) on the catalytic properties were also studied. The results of experiments showed that the addition of MgO to Rh/Ce0.5Zr0.5O2/Al2O3 improved the stable performance and the carbon resistance of the catalyst. The optimized catalyst was 0.1%Rh/2.0%MgO/40%Ce0.5Zr0.5O2/Al2O3, which showed a highly stable performance for methane autothermal reforming.