小晶粒ZSM-22的可控合成及其催化长链正构生物烷烃制航空煤油性能  

Controllable synthesis of small size ZSM-22 zeolites and their performance in the production of bio-jet fuel by hydrocracking and hydroisomerization of long-chain normal bio-paraffins

作　　者：韩京京 谭涓[1] 刘靖[1] 刘宇 HAN Jingjing;TAN Juan;LIU Jing;LIU Yu(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China)

机构地区：[1]大连理工大学化工学院,辽宁大连116024

出　　处：《化工进展》2022年第4期1916-1924,共9页Chemical Industry and Engineering Progress

摘　　要：由生物脱氧油制生物航空煤油具有较大应用潜力和发展前景,为了提高生物航煤的收率,开发性能更好的加氢裂化/异构化催化剂是关键。本文采用水热合成法,在低温陈化、加入晶种、提高合成凝胶的碱度或加入有机碱条件下,合成了平均c轴尺寸在100~330nm的小晶粒ZSM-22分子筛,进行了XRD、SEM、N_(2)物理吸附、NH_(3)-TPD和吡啶红外表征,并以生物质油加氢脱氧得到的长链正构生物烷烃为原料,考察了不同晶粒尺寸ZSM-22催化剂催化裂化和异构化制生物航空煤油的性能。结果表明,通过提高碱度合成的小晶粒H-ZSM-22具有较强的酸中心,较多可及的强B酸中心数量,其长链正构烷烃转化率可达80%以上。在此基础上,制备的Pt/ZSM-22催化剂具有较高的Pt分散度,表现出很好的加氢裂化/异构化性能,其长链正构烷烃的转化率高达97.79%,生物航煤收率达50.25%,航煤产物异正比为7.55。The production of bio-jet fuel from biological deoxygenated oil has great application potential and development prospects.To improve the yield of bio-jet fuel,it is essential to develop high performance catalysts for the hydrocracking and hydroisomerization.After low-temperature aging,adding seeds or increasing the alkalinity of the initial gel and crystallization,small size ZSM-22 zeolites were obtained with the average c-axis size between 100-330nm.The samples were characterized by XRD,SEM,N_(2) physical adsorption,NH_(3)-TPD and Py-IR.Catalysts prepared by ZSM-22 with different crystal sizes were evaluated on the cracking and isomerization of long-chain normal bio-paraffins from hydrodeoxygenated biomass oil to bio-jet fuel.The results indicated that,the small crystal size H-ZSM 22 synthesized by increasing alkalinity of gel had stronger acid centers and more accessible strong B acid centers.The conversion of long-chain normal bio-paraffins were more than 80%.Further,the Pt/ZSM-22 catalyst possessed high Pt dispersion and exhibited great hydrocracking and isomerization performance.The conversion reached 97.79%,and the yield of bio-jet fuel was as high as 50.25%with an iso/n-paraffin ratio of 7.55.

关 键 词：ZSM-22分子筛 长链正构生物烷烃 加氢裂化/异构化 收率 小晶粒 

分 类 号：S216[农业科学—农业机械化工程] O643.36[农业科学—农业工程]