镍对接触剂上渣油接触裂化反应的影响

EFFECT OF NICKEL ON CONTACT CRACKING CATALYST AND CONTACT CRACKING OF RESIDUE

采用饱和浸渍法制备了4种较高镍含量的接触剂,利用N_(2)吸附-脱附、X射线衍射、H_(2)程序升温还原、电子探针X射线显微分析等手段开展了镍对接触剂物性影响的研究,在小型固定流化床试验装置上考察了镍对渣油接触裂化反应性能的影响。结果表明:镍对接触剂孔结构影响较小,即使接触剂上的镍质量分数达5.17%,接触剂比表面积和孔体积也变化不大;接触剂上的镍促进了重油接触裂化反应过程中干气和焦炭的生成,特别是焦炭收率增加更明显,致使生氢因子增加,提高了接触剂的脱氢性能。

Four kinds of contact agents with high nickel content were prepared by saturated impregnation method. The effects of nickel on the physical properties of contact agent were studied by BET,XRD,H_(2)-TPR,EPMA and other means. The effects of nickel on the contact cracking of residue were investigated in a small fixed fluidized bed experimental equipment. The results show that nickel has little effect on the pore structure of the contact agent, even if the nickel content on the contact agent reaches 5.17%. The specific surface area and pore volume of the contact agent have little change. Nickel on the contact agent promoted the formation of dry gas and coke in the process of heavy oil contact cracking, especially the increase of coke yield, which led to the increase of hydrogen generation factor and promoting the dehydrogenation performance of the contact agent.