摘要
采用磷氧化物对ZSM 5沸石进行修饰改性 ,用XRD、NMR、IR、BET等物化手段对改性后沸石的物化性质变化情况进行了表征 ,并采用轻油微反和小型固定流化床催化裂化装置对改性后的样品进行了反应性能评价。结果表明 ,采用磷氧化物对ZSM 5沸石的修饰改性能够抑制它在水热条件下的骨架脱铝 ,并延缓沸石在水热过程中的晶系转变 ,保持结构的对称性不下降 ,从而显著改善ZSM 5沸石的水热活性稳定性 ,而沸石的晶体形貌及孔体积等没有受到大的影响。磷化物的修饰改性还改善了ZSM 5沸石的酸强度分布状况 ,少量加入FCC催化剂中可使裂化反应中的择形催化性能得到改善 ,较好地提高了催化裂化汽油的辛烷值 ,特别是马达法辛烷值。
The physicochemical features of ZSM 5 zeolite modified with phosphorus oxide were characterized by XRD, NMR, IR and BET, and the shape selective catalytic performance of the samples were investigated on MAT and fixed fluidized bed reactor. The dealumination of the modified zeolite under severe hydrothermal treatment was restrained and the space group symmetry of the zeolite crystal was maintained. No obvious effect on the morphology of crystal and pore volume of the zeolite was observed. Its hydrothermal stability, acid intensity distribution and shape selective catalytic performance were improved. Adding a low amount of the said zeolite to the FCC catalyst increased the MON of the cracked naphtha.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2001年第11期48-51,共4页
Petroleum Processing and Petrochemicals
