加氢异构化催化剂的研究——酸性能的影响  

Study on Hydroisomerization Catalysts——Effect of Acid Property

作　　者：毕云飞[1] 夏国富[1] 黄卫国[1] 方文秀[1] 

机构地区：[1]中国石化石油化工科学研究院,北京100083

出　　处：《石油学报（石油加工）》2017年第5期873-879,共7页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：以具有不同硅/铝摩尔比的ZSM-12和ZSM-22分子筛为研究对象,采用XRD、XRF、N2吸附、吡啶吸附和SEM等分析工具对合成的分子筛样品进行了详细的表征。结果表明,所用分子筛为纯相晶体且Al原子完全处于分子筛骨架中;分子筛Br9nsted酸中心数量和强度随硅/铝摩尔比变化而改变。以正癸烷为模型化合物对制备的催化剂进行加氢异构化反应评价。结果表明,分子筛的酸性中心数量是影响催化剂活性的主要因素;在低转化率(<85%)下,Br9nsted酸中心数量对催化剂异构选择性的影响要大于强Br9nsted酸中心的比例。另一方面,研究结果也表明,即使分子筛酸性质相同,如果分子筛孔径不同,相应催化剂所表现出来的催化活性和选择性也是不相同的。ZSM-12 and ZSM-22 zeolites with different Si/Al molar ratios were investigated.The zeolite samples were detailedly characterized by XRD, XRF,nitrogen adsorption,pyridine adsorption and SEM.The results revealed that the employed zeolite samples were pure crystals and all alumina atoms were in the framework.Moreover,the amount and strength of Br9 nsted acid sites varied with Si/Al molar ratio in the employed zeolites.The tests for paraffin hydroisomerization over the prepared catalysts were carried out using decane as model molecule.It clearly revealed that the sum of acid sites on a zeolite was the key factor determining activity of the corresponding catalyst.Compared to the ratio of strong Br9 nsted acid site to total Br9 nsted acid site,the sum of acid sites on a zeolite was also a more important factor to the isomer selectivity when the conversion was less than 85%.On the other hand,it was also proved that the effect on activity and selectivity of the corresponding catalysts from similar acid properties of the employed zeolites was different if pore diameters of the zeolites were different.

关 键 词：ZSM-12 ZSM-22 加氢异构化 正癸烷 多支链异构体 

分 类 号：TE624.43[石油与天然气工程—油气加工工程] TE626.3