石油学报(石油加工) ›› 2020, Vol. 36 ›› Issue (4): 712-719.doi: 10.3969/j.issn.1001-8719.2020.04.008

• 研究报告 • 上一篇    下一篇

锌和钾改性HZSM-5临氢芳构化催化剂研究

张孔远 ,王崇, 付兴旺, 郑传富, 刘晨光   

  1. 中国石油大学(华东)化学化工学院,山东 青岛 266580
  • 收稿日期:2019-05-28 修回日期:2020-05-07 出版日期:2020-07-25 发布日期:2020-09-23
  • 通讯作者: 王崇,男,硕士,从事工业催化,石油与天然气加工方面的研究,E-mail:shishui.hi@163.com E-mail:zkyuana@126.com
  • 作者简介:第一作者:张孔远,男,教授,博士,从事工业催化、石油与天然气加工方面的研究,E-mail:zkyuana@126.com
  • 基金资助:
     

Study on HZSM-5 Catalyst Modified by Zn and K for Hydroaromatization

 ZHANG Kongyuan, WANG Chong, FU Xingwang, ZHENG Chuanfu, LIU Chenguang   

  1.  College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
  • Received:2019-05-28 Revised:2020-05-07 Online:2020-07-25 Published:2020-09-23
  • Supported by:
     

摘要: 以等体积浸渍法制备了Zn/HZSM-5和不同含量K改性的K-Zn/HZSM-5催化剂,采用XRD、NH3-TPD、py-IR和N2吸附-脱附等方法对所制备催化剂进行了表征,在HZSM-5催化剂中加入5%质量分数的ZnO,催化剂的总酸量略有增加,L/B酸比值增加;同时又加入不同含量的K2O,随着K2O含量的增加,催化剂的L酸量和L/B酸比值均降低,少量K2O的引入对催化剂酸性质影响较小。以正庚烷为原料考察HZSM-5催化剂以及Zn和K改性后的催化剂的临氢芳构化性能,结果表明,ZnO质量分数为5%、K2O质量分数不超过0.5%时,随着钾含量的升高,改性催化剂的芳构化率和苯、甲苯、二甲苯(BTX)的选择性大幅提高,C9+芳烃的选择性降低,Zn和K改性催化剂的活性和稳定性较好。

关键词: HZSM-5催化剂, 临氢芳构化;Zn 、K改性;正庚烷

Abstract:

HZSM-5 zeolite was modified by Zn and K using equal volume impregnation method. These catalysts were characterized by XRD, NH3-TPD, Py-IR and N2 adsorption-desorption methods. When adding 5% (mass fraction) ZnO to HZSM-5 catalyst, the total acid amount and the ratio of L acid amount to B acid amount become slightly increased. When adding different content of K2O and 5% mass fraction ZnO to HZSM-5 catalyst, the amount of L acid and the ratio of L acid amount to B acid amount are decreasing with the increase of K2O content. The catalytic properties of HZSM-5,Zn/HZSM-5 and K-Zn/HZSM-5 in hydroaromatization were investigated with n-heptane as probe reactant. Results show that the aromatization rate and the selectivities of benzene, toluene and xylene(BTX) increase greatly with the increasing of K when the mass fraction of ZnO is 5% and the mass fraction of K2O is not more than 0.5%, while the selectivity of C9+ aromatics decreases greatly, and the activity and stability of the K-Zn/HZSM-5 catalyst are good.

Key words: HZSM catalyst, hydroaromatization, Zn and K modification, n-heptane

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