硼基催化裂化钝镍剂的工业应用及其钝镍机理

使用B基无毒催化裂化钝镍剂可使汽油收率增加 1% ,氢气和焦炭产率分别下降 35 %和 10 %以上 ,该剂的整体钝镍性能不低于目前应用广泛的锑基有毒钝镍剂YXM。结合MAT ,TPR ,XRD等实验方法和量子化学计算理论研究阐明了该钝镍剂的钝镍机理 :在FCC再生条件 (约 70 0℃ ,氧化性气氛 )下 ,由于硼基钝镍剂热分解生成B2 O3 并与NiO反应生成Ni2 B2 O5,增加了Ni2 + 的LUMO能量 ,降低了Ni2 + 在FCC反应条件 (约 5 0 0℃ ,还原性气氛 )下的还原度 ,抑制了Ni0 的强催化脱氢活性 ,从而达到钝镍的目的

Application of B-contained Ni Passivator in FCC and its Mechanism

The non toxic nickel passivator(named BPN) consisting of B contained salt can decrease the yields of hydrogen and coke by 35% and 10% respectively,while increasing the yield of gasoline by 1%.The mechanism of nickel passivation by BPN has also been investigated, in which the methods of NAT,TPR and XRD were used, combined with quantum chemistry calculation.The results show that the new compound Ni 2B 2O 5 is formed after the addition of BPN to Ni deposited zeolite under the condition of FCC regeneration.Since the energy of LUMO of Ni 2B 2O 5 is much higher than that of NiO,Ni 2B 2O 5 is more difficult to be reduced than NiO under the condition of FCC reaction.Therefore, the dehydrogenation activity of Ni 0 is inhibited.This is the nickel passivation mechanism of BPN.