Abstract:
LaCo0.7Cu0.3O3 was supported on SiO2 according to the incipient wetness impregnation method combined with citrate complexing method. The prepared catalyst precursors were characterized by XRD, BET, H2-TPR and TEM.The catalytic performance for higher alcohols synthesis from syngas was conducted in a slurry reactor, which was compared with that in fixed-bed reactor. After reduction, the catalyst precursor favoured to form nanoparticles of Cu-Co alloy highly dispersed on SiO2 and modified with La2O3. In slurry reactor, the selectivity to C2+OH was much higher, which may be attributed to the effect of liquid slurry of paraffin for suppressing the desorption of methanol and the formation of hot-spots. Under the experimental condition of 900 to 1 500 mL/(gcat·h), 3 MPa, H2∶CO∶N2=8∶4∶1 and 250 ℃，C2+OH in the total alcohols was more than 95% in weight.
