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考察了锆助剂含量对钴基催化剂的结构及费 托合成反应性能的影响 .结果表明 ,随着锆含量的增加 ,甲烷的生成受到抑制 ,重质烃选择性提高 ,重质烃合成的操作温度区间加宽 ,且催化剂仍保持较高的活性 .TPR ,H2 TPD ,XRD及EXAFS等表征结果表明 ,锆助剂单层分散于硅胶表面 ,而钴以一定尺寸的聚集态存在 ;随着锆含量的增加 ,锆覆盖的硅胶表面增加 ,裸露的硅胶表面减小 ,而钴的分散度几乎不变 .这使得钴锆界面增大 ,钴硅界面减小 ,有利于重质烃的生成 .另外 ,H2 TPD结果还表明 ,催化剂存在有从钴到锆硅载体的氢溢流 .
The effects of zirconium additives on the structure of the cobalt-based catalysts and the Fischer-Tropsch synthesis reaction performance were investigated. The results show that with the increase of the zirconium content, the generation of methane is inhibited, the selectivity of heavy hydrocarbons is increased, the operation of heavy hydrocarbon synthesis The results show that the zirconium promoter is monolayer dispersed on the surface of silica gel, while cobalt exists in aggregated state with certain size. With the increase of zirconium The content of zirconium coated silica gel increases, the surface of bare silica gel decreases, while the dispersion of cobalt is almost unchanged, which makes the interface of cobalt and zirconium increase, and the interface of cobalt and silicon decreases, which is good for the formation of heavy hydrocarbons. The H2 TPD results also show that there is hydrogen overflow from the cobalt to the zirconium silicate support on the catalyst.