摘要
通过MAT、TPR、XRD等试验方法和量子化学计算系统研究了无毒镁盐钝镍剂 (MPN)的钝镍机理。结果表明 ,在FCC再生条件 (约 70 0℃ ,氧化性气氛 )下 ,由于Mg2 + 和Ni2 + 在NiO(2 2 0 )晶面发生晶格取代 ,增加了Ni2 + 的最低空轨道 (LUMO)能量 ,降低了高价镍在FCC反应条件 (约 5 0 0℃ ,还原性气氛 )下的还原度 ,抑制了FCC催化剂上低价镍的脱氢生焦活性 ,从而达到钝镍目的。工业试验结果表明 ,在FCC装置中使用MPN使轻油收率提高 2 .5个百分点 ,氢气产率下降 35 % ,待生剂上的积炭量下降 9.42 % ,具有良好的钝镍效果。
The nickel passivation mechanism of magnesium salt passivatior (MPN) for catalytic cracking was studied through MAT, TPR and XRD methods combined with quantum chemistry calculation. The results showed that the lattice substitution took place between MgO and NiO after the addition of MPN to the nickel contaminated FCC catalyst, which led to the energy of LUMO increasing in Ni 2+ and then lowering the reducibility of Ni 2+ under FCC reaction condition. Therefore, the dehydrogenation activity of Ni 0 was inhibited. A commercial test of MPN passivator added into a FCCU indicated that the light oil yield increased by 2.5 percentages, and the hydrogen and coke on spent catalyst decreased by 35% and 9.42% respectively.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2001年第10期33-35,共3页
Petroleum Processing and Petrochemicals
基金
中国石油天然气集团公司"九五"科技攻关项目((96)科字第 198号 )
