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SO2选择性加氢制硫催化剂研究

Study on sulfur dioxide selective hydrogenation catalysts for preparation of sulfur

  • 摘要:
    目的 解决硫磺回收装置SO2选择性加氢工艺催化剂配套及传统活性氧化铝载体氧化铝含量低和钠含量高的问题。
    方法 选择异丙醇铝为原料,利用醇铝法在实验室制备了拟薄水铝石粉体,通过挤条成型制备了活性氧化铝载体,并负载活性金属制成三叶草型SO2选择性加氢制硫催化剂。
    结果 催化剂堆积密度0.55~0.65 g/mL,比表面积≥250 m2/g,孔容≥0.4 mL/g,氧化铝质量分数≥95%,氧化钠质量分数≤100×10-6,该催化剂在H2S/SO2体积比为20、H2体积分数为2%、温度为200 ℃的条件下,催化剂的SO2加氢转化率为95.13%,SO2转化为元素硫的选择性为91.22%。
    结论 催化剂具备良好的活性,可以替代进口催化剂应用于SO2选择性加氢工艺硫磺回收装置。

     

    Abstract:
    Objective Solve the catalyst support issue of sulfur dioxide selective hydrogenation process for sulfur recovery unit, and low alumina content and high sodium content of traditional activated alumina carrier.
    Methods Using aluminum isopropoxide as raw material, pseudo boehmite powder was prepared in the laboratory by alcohol aluminum method, activated alumina support was prepared by extrusion, and clover-type sulfur dioxide selective hydrogenation catalyst for preparation of sulfur was prepared by loading the active metal.
    Results The bulk density of the catalyst was 0.55-0.65 g/mL, the specific surface area was greater than or equal to 250 m2/g, the pore volume was greater than or equal to 0.4 mL/g, the mass fraction of alumina was greater than or equal to 95%, and the content of sodium oxide was less than or equal to 100×10-6. When the volume ratio of H2S to SO2 was 20, H2 concentration was 2%, and temperature was 200 ℃, the hydrogenation conversion rate of sulfur dioxide was 95.13%, and the selectivity of sulfur dioxide to elemental sulfur was 91.22%.
    Conclusions The catalyst has good activity and can be used in sulfur recovery unit of SO2 selective hydrogenation process instead of imported catalyst.

     

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