La改性ZSM-5分子筛及其在催化裂解反应中的应用

doi:10.11949/j.issn.0438-1157.20160395

化工学报 ›› 2016, Vol. 67 ›› Issue (8): 3408-3414.DOI: 10.11949/j.issn.0438-1157.20160395

• 催化、动力学与反应器 • 上一篇下一篇

La改性ZSM-5分子筛及其在催化裂解反应中的应用

张络明, 许春芳, 马通, 巩雁军

中国石油大学(北京)化学工程学院, 重质油国家重点实验室, CNPC催化重点实验室, 北京 102249

收稿日期:2016-03-31 修回日期:2016-06-29 出版日期:2016-08-05 发布日期:2016-08-05
通讯作者: 巩雁军
基金资助:
国家重点基础研究发展计划项目（2012CB215002）；国家自然科学基金项目（21176255，21276278）；中国石油天然气集团公司项目（2014A-2111）。

Synthesis of La-modified ZSM-5 zeolite and performance for catalytic cracking reaction

ZHANG Luoming, XU Chunfang, MA Tong, GONG Yanjun

State Key Laboratory of Heavy Oil Processing, the Key Laboratory of Catalysis of CNPC, China University of Petroleum, Beijing 102249, China

Received:2016-03-31 Revised:2016-06-29 Online:2016-08-05 Published:2016-08-05
Supported by:
supported by the National Basic Research Program of China (2012CB215002), the National Natural Science Foundation of China (21176255, 21276278) and the Project of China National Petroleum Corporation (2014A-2111).

摘要/Abstract

摘要：

采用高温水热法和等体积浸渍法将La离子负载于ZSM-5分子筛上得到了改性ZSM-5分子筛材料。水热法La改性样品改变了ZSM-5的晶胞尺寸，提升了其强酸、弱酸及总酸量。浸渍法改性样品也提高了其酸量但是对晶胞参数没有影响。将改性样品应用于正己烷催化裂解反应中，两种方法均得到了较高的双烯收率，其中水热法改性样品在空速为6 h^-1时乙烯收率和丙烯收率分别为23.39%和25.17%，这与原样相同空速下的乙烯丙烯收率（乙烯为21.19%，丙烯为21.04%）相比分别提升了约2%和4%，略高于浸渍法改性样品。在长周期反应寿命方面也有了显著提高，在空速为4 h^-1时，水热法改性样品（2000 min）和浸渍法改性样品（1600 min）均显著优于原样（800 min）。这些结果表明采用水热法La改性可以更好地提升ZSM-5分子筛在正己烷催化裂解反应中的性能。

关键词: 镧改性, 水热法改性, 浸渍法, ZSM-5, 催化裂解, 催化剂

Abstract:

A series of La-modified ZSM-5 were prepared by hydrothermal treatment and incipient wetness impregnation. Compared with those of pristine ZSM-5, an increase in lattice constants and the amount of strong, weak and the total acid cites of La-modified ZSM-5 by the hydrothermal treatment occurs. The amount of acid cites of by La-modified ZSM-5 by incipient wetness impregnation increases, however, the lattice constants does not change. High yields of ethylene and propylene were obtained on both kinds of modified samples tested in the catalytic cracking of hexane. The yields of ethylene and propylene were achieved on the samples modified by hydrothermal treatment at WHSV 6 h^-1 (23.39% of ethylene, 25.17% of propylene), which are 2% and 4% larger than those of the pristine ZSM-5 samples (21.19% of ethylene, 21.04% of propylene), and slightly better than those of the samples modified by incipient wetness impregnation. In the long-term experiment of hexane cracking with at WHSV 4 h^-1, the samples modified by hydrothermal treatment (2000 min) and incipient wetness impregnation (1600 min), exhibited much longer durability than the pristine ZSM-5 sample (800 min). It suggested that the hydrothermal treatment is better modification method in the preparation of La-modified ZSM-5 catalyst to improve the performance of hexane catalytic cracking.

Key words: La modification, hydrothermal treatment, impregnation, ZSM-5, catalytic cracking, catalyst

中图分类号:

TQ028.8

张络明, 许春芳, 马通, 巩雁军. La改性ZSM-5分子筛及其在催化裂解反应中的应用[J]. 化工学报, 2016, 67(8): 3408-3414.

ZHANG Luoming, XU Chunfang, MA Tong, GONG Yanjun. Synthesis of La-modified ZSM-5 zeolite and performance for catalytic cracking reaction[J]. CIESC Journal, 2016, 67(8): 3408-3414.

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La改性ZSM-5分子筛及其在催化裂解反应中的应用

Synthesis of La-modified ZSM-5 zeolite and performance for catalytic cracking reaction

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