SO2选择性加氢制硫催化剂研究

Study on sulfur dioxide selective hydrogenation catalysts for preparation of sulfur

关键词:  醇铝法  拟薄水铝石  三叶草形  浸渍法  选择性加氢  硫磺回收  催化剂

Key words:  alcohol aluminum method  pseudo boehmite  clover type  impregnation method  selective hydrogenation  sulfur recovery  catalyst

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%. Conclusion sThe catalyst has good activity and can be used in sulfur recovery unit of SO₂ selective hydrogenation process instead of imported catalyst.