Catalytic Conversion Of Synthesis Gas On Co Catalysts

Catalytic conversion of synthesis gas is a process in which synthesis gas is converted to high value chemicals by using catalyst. It is the most realistic method to acquire alternative fuel and bulk chemical raw materials under the situation of oil crisis. The core of the conversion is to develop catalyst of low temperature activity and high selectivity.In this paper, Al2O3 carrier was prepared through sol-gel method. The influences of water hot auxiliary sol-gel method, reaction temperature, dispersants. calcinated temperature on specific surface area and pore size of carrier were investigated. Moreover, Co/Al2O3 catalyst was prepared by volumetric immersion method. The Influences of carrier pretreatment, impregnating solution, active component cobalt load, calcinated temperature of Co/Al2O3 and reduction temperature through preparation process were studied systematically. The catalytic activity of catalyst was evaluated in self-built fixed bed reactor. And the influences of catalyst evaluation conditions on product composition were discussed. The effect of former factors on structure activity relationship was explored by H2-TPR, XRD. BET. XPS, TEM characterization. The Structure activity relationship is between physical structure of Co catalyst and the catalytic conversion performance of synthesis gas.The result showed that pore size distribution of carrier prepared by water hot auxiliary sol-gel method is narrower. When taken poly(ethylene glycol) 1000 as dispersant,γ-Al2O3 carrier was acquired after calcined for 6 h at 800℃, of which specific surface area was 261.71 m2/g, and the pore size was 13 mm. Under the condition of ethanol as impregnant,20% of Co load, calcinated for 4 h at 500℃, reduction for 8 h at 550℃, CO conversion reached the highest, which is up to 46%.