催化剂上沉积钒氧化数对降低FCC汽油中硫含量的影响

过滤金属化合物与硫化物相互作用的分子模拟研究结果表明，低氧化数钒的氧化物有利于促进硫化物的转化。然而，工业运转中催化剂在进入反应器前已经历氧化再生，沉积于其上的钒处于高氧化数状态，为此提出了强化降低催化剂上沉积钒氧化数的“择效活化”方法。电子顺磁共振(ESR)结果表明，通过择效活化处理，催化剂上沉积钒的氧化数下降。重油微反评价结果表明，高钒活化剂进一步表现出明显优于高钒再生剂的降硫作用；高钒人工污染再生剂具有强于未污染剂的降硫作用，并且经择效活化后，高钒污染活化剂进一步表现出明显优于高钒污染再生剂的降硫作用，评价实验证实了分子模拟计算的结果。

EFFECT OF OXIDATION NUMBER OF DEPOSITED VANADIUM ON CRACKING CATALYST ON REDUCTION OF SULFUR IN FCC GASOLINE

Molecular simulation modeling study indicated that vanadium oxides with vanadium of low oxidation number facilitated the conversion of sulfides. In FCC operation, however, vanadium deposited on regenerated catalyst was in high oxidation number state. Lab study was carried out to develop a method of activation treatment of catalyst named selective activation, which was able to enhance the reduction of V oxidation number of catalyst in order to observe its effect on reducing FCC gasoline sulfur content. ESR identification showed that selective activation was effective in the reduction of V oxidation number of treated catalysts. A kind of heavy gas oil was used to evaluate the performance of V contaminated catalyst as well as equilibrium FCC catalysts before and after selective activation. Experimental results showed clearly that the selective activated catalysts played better performance than the unactivated catalysts in reducing gasoline sulfur, which were in good agreement with the molecular simulation modeling results.