化工进展 ›› 2022, Vol. 41 ›› Issue (4): 1916-1924.doi: 10.16085/j.issn.1000-6613.2021-0938

• 工业催化 • 上一篇    下一篇

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

韩京京(), 谭涓(), 刘靖, 刘宇   

  1. 大连理工大学化工学院,辽宁 大连 116024
  • 收稿日期:2021-05-05 修回日期:2021-07-05 出版日期:2022-04-23 发布日期:2022-04-25
  • 通讯作者: 谭涓 E-mail:hanjingjing0921@163.com;tanjuan@dlut.edu.cn
  • 作者简介:韩京京(1997—),女,硕士研究生,研究方向为分子筛合成及可再生能源催化转化。E-mail:hanjingjing0921@163.com

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

HAN Jingjing(), TAN Juan(), LIU Jing, LIU Yu   

  1. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2021-05-05 Revised:2021-07-05 Online:2022-04-23 Published:2022-04-25
  • Contact: TAN Juan E-mail:hanjingjing0921@163.com;tanjuan@dlut.edu.cn

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、N2物理吸附、NH3-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。

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

Abstract:

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, N2 physical adsorption, NH3-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.

Key words: ZSM-22 zeolite, long-chain normal bio-paraffins, hydrocracking and hydroisomerization, yield, small crystal size

中图分类号: 

  • S216