The Study Of Modified Cu-Fe Catalyst For Lower Alcohols Form Syngas

Preparation lower-alcohol synthesis form syngas isinlinewithChina’s energy distribution. Ithas important implications in terms of environmental protection and resource utilization, andithas been widespread concerned.The effect of catalytic of different Cu/Fe ratios was investigated. CO conversion with the increased Cu/Fe ratio increases and then decreases, when Cu:Fe=1:1, it reaches the maximum; alcohol selective increases with the increased Cu/Fe ratio; yield of alcohols with Cu/Fe ratio increases and then decreases, when Cu:Fe=7:3it reaches maximum.The effects of Zn and Mn promoters on the catalyst was explored. They can increase the conversion of CO largely and improve the selectivity of alcohol; Zn and Mn can promote the generation of methanol, leading to the reduce of distribution of C2+OH.The effects of H2/CO ratio, GHSV and pressure on the catalytic effect was studied. With the improvement of H2/CO ratio, conversion of CO increases; selectivity and yield of alcohol with increased H2/CO ratio increases and then decreases, and it reaches maximum at H2/CO=1:1. When GHSV increases, the time of syngas contacting the catalyst decreases, and conversion of CO decreases; the selectivity of alcohol with the increased GHSV decreases and then increases, and when GHSV=5000h’1, it reaches the maximum; when GHSV increases, the distribution of C2+OH will reduce. Higher pressure can increase the conversion of CO, and enhance the selectivity of the alcohol and improve the distribution of C2+OH.Finally, the effects of alkali metals K and Na on the catalyst was researched. The conversion of CO was affected by K and Na little and it can reaches90%under the experimental conditions. Na and K can promote the generation of the alcohol especially the C2+OH. With respect to K, Na element can increase selectivity of alcohol and improve the distribution of C2+OH a greater degree.