Effect of calcination temperature on performance of K-Cu/Zn/La/ZrO₂ for isobutanol synthesis

K-promoted Cu/Zn/La/ZrO₂ catalyst were prepared by coprecipitation methods. Hydrogenation of CO was used as a probe reaction to investigate the catalytic performance. Structure and surface properties of K-Cu/Zn/La/ZrO₂ catalysts were characterized by XRD,TG,BET, NH₃-TPD, H₂-TPR, Raman and XPS technics. The results indicated that structure and specific surface had no direct relationship with the catalyst activity. Strong acidic sites of catalyst surface were not good for the formation of isobutanol. Synergy among Cu-Zn-Zr has an important effect on the activity of K-Cu/Zn/La/ZrO₂ catalysts. When the calcinations temperature was at 450 ℃, synergistic effect of Cu-Zn-Zr became strongest and CuO could be reduced easily. Under the optimum calcination temperature, conversion of CO reached 69.47% and selectivity of isobutanol approached 19.09%. Methanol and isobutanol were the primary products and occupied 95.02% in the alcohol products.