改性USY型FCC催化剂对硫转移性能的影响

Influence of Modification of FCC Catalyst on the Performance of Sulfur Transfer

通过考察MgO对USY型催化裂化(FCC)催化剂改性所引起的基质结构的变化,研究了不同反应条件及引入铈、镧、磷对硫转移活性的影响。结果表明:改性导致基质表面形成了表层镁铝尖晶石结构,使催化剂具有一定的硫转移活性。铈和镧的引入可有效提高活性,而磷的引入对活性无明显影响,温度升高可显著提高二氧化硫的氧化速率,氧含量为零时硫转移活性很低。

The ultrastable zeolite Y fluid catalytic cracking catalyst was modified by MgO for changing the matrix structure to improve the performance of sulfur transfer. The effect of different conditions and introduction of cerium, lanthanum, phosphor on sulfur transfer was investigated. The result showed that the out-layer Mg-Al spinel was formed on the matrix by modification to bring the catalyst the activity of sulfur transfer. The sulfur transfer activity wasn't efficiently improved by introduction of phosphor but by introduction of cerium and lanthanum. As the reaction temperature raised, SO_2 oxidation greatly (increased.) When there is no oxygen existed, the sulfur transfer activity is very low.