Study on the performance of CO2 hydrogenation to methanol on La-Cu/ZnO/ZrO2 catalysts
Cu/ZnO/ZrO2 catalysts doped with different contents of La were prepared by the co-precipitation method and experimentally investigated with respect to the synthesis of methanol by CO2 hydrogenation.The advantages of La for Cu/ZnO/ZrO2 catalysts were investigated by XRD,N2 physisorption,N2O chemisorption,XPS,H2-TPR,and CO2-TPD,and the effects of different contents of La were investigated.The effects of the incorporation of different dopant amounts(0％-10％)of La on the average particle size,aggregation state,and the interaction of the elements of Cu were discussed in detail.The experiments showed that the specific surface area and dispersion of the Cu/ZnO/ZrO2 catalysts were significantly increased by the doped La,and the number of basic sites was significantly increased compared with that of the unmodified catalysts with an obvious advan-tage of methanol selectivity.The doping of La promoted the Cu-ZnO interactions and enhanced the catalytic per-formance.The appropriate La content is favorable to the catalytic performance of the Cu/ZnO/ZrO2 catalysts,and the highest spatial and temporal yield of CH3OH reached 0.35(g(MeOH)/g(cat)` h)at 240 ℃ and 3 MPa with 5％La content.
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