Synthesis and Characterization of Iron-Substituted ZSM-23 Zeolite Catalysts with Highly Selective Hydroisomerization of n-Hexadecane

被引：41
作者：
Chen, Yujing [1 ]
Li, Chuang [1 ]
Chen, Xiao [1 ]
Liu, Yan [1 ]
Tsang, Chi-Wing [1 ]
Liang, Changhai [1 ]
机构：
[1] Dalian Univ Technol, Sch Chem Engn, Lab Adv Mat & Catalyt Engn, Dalian 116024, Peoples R China
来源：
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH | 2018年 / 57卷 / 41期
关键词：
BRONSTED ACID SITES; ISOMORPHOUS SUBSTITUTION; PT/ZEOLITE CATALYSTS; INTERGROWTH ZEOLITE; NITROGEN-COMPOUNDS; SHAPE SELECTIVITY; MOLECULAR-SIEVES; SILICA-ALUMINA; VEGETABLE-OILS; ISOMERIZATION;
D O I：
10.1021/acs.iecr.8b03806
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
A series of Fe-substituted ZSM-23 samples with different Fe/(Fe + Al) ratios were synthesized. Combined characterization by Fourier transform infrared spectroscopic, ESR, and X-ray photoelectron spectrosopic methods confirmed the presence of Fe in the ZSM-23 framework. The crystal size decreased with increasing Fe/(Fe + Al) ratio, and the Fe-substituted ZSM-23 samples exhibited large specific areas and pore volumes. The introduction of Fe in the framework reduced the acid strength compared with the Fe-free counterparts. Compared with the Pt/Fe-free ZSM-23 catalyst, the Pt/Fe-substituted catalysts showed lower activity to the hydroisomerization of n-hexadecane and higher isomerization selectivity. This is attributed to their higher ratios of weak and strong Bronsted acidic sites and smaller crystal size, which improved the product diffusion and suppressed the further product cracking. More 5M-C-15 isomers were obtained over the Pt/Fe-substituted catalysts, which was different from the product distribution of Pt/Fe-free ZSM-23 where 2M-C-15 isomers were the major isomer products.
引用
收藏
页码：13721 / 13730
页数：10
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