降低催化裂化汽油硫含量助剂的研究--锌铝尖晶石的合成及其裂化脱硫性能

考察了不同方法及不同原料制备的锌铝尖晶石作为降低催化裂化汽油硫含量助剂的裂化脱硫性能。结果表明，采用胶溶法制备的锌铝尖晶石具有较高的结晶度和较好的裂化脱硫活性；在硝酸锌、氯化锌和碱式碳酸锌这几种原料中，用碱式碳酸锌制备的锌铝尖晶石的裂化脱硫性能最好；在锌铝尖晶石的合成过程中加入少量的RE2O3，可以提高其比表面稳定性，进而提高其裂化脱硫性能。评价结果表明，在老化的工业催化剂中加入10％的锌铝尖晶石助剂，可使催化裂化汽油的硫含量降低30％以上。

STUDY ON THE ADDITIVE FOR GASOLINE SULFUR REDUCTION--Comparison of synthesis methods for Zn(AlO2)2 spinel and its desulfurization properties during FCC

A number of Zn(AlO_2)_2 spinel samples for reducing sulfur content in FCC gasoline were prepared by different methods or using various zinc-containing compounds, such as zinc nitrate, zinc chlorides, basic zinc carbonate. Through the comparison of their desulfurization properties as additives, it is shown that the Zn(AlO_2)_2 spinel sample prepared by peptization with the basic zinc carbo- nate as the zinc source had higher crystallinity and desulfurization activity. It is also shown that the surface stability and the desulfurization activity of Zn(AlO_2)_2 spinel could be increased when adding a little of RE_2O_3 during synthesis. The evaluation results showed that when adding 10% Zn(AlO_2)_2 spinel additive into the steam-deactivated commercial cracking catalyst the sulfur content in FCC gasoline decreased more than 30%.