Formaldehyde intermediate participating in the conversion of methanol to aromatics over zinc modified H-ZSM-5

被引：52
作者：
Ni, Youming [1 ,2 ]
Zhu, Wenliang [1 ,2 ]
Liu, Zhongmin [1 ,2 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Natl Engn Lab Methanol Olefins, Dalian 116023, Liaoning, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
来源：
JOURNAL OF ENERGY CHEMISTRY | 2021年 / 54卷
基金：
中国国家自然科学基金;
关键词：
Methanol; Formaldehyde; Aromatics; Zn; H-ZSM-5; TO-HYDROCARBONS; CATALYTIC CONVERSION; SELECTIVE CONVERSION; ZEOLITE H-ZSM-5; DEHYDROGENATION; AROMATIZATION; MECHANISM; INSIGHTS; BENZENE; SYNGAS;
D O I：
10.1016/j.jechem.2020.05.063
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Metal-modified H-ZSM-5 has a high selectivity of aromatics in methanol to aromatics (MTA) reaction, which is often attributed to the metal promoting the aromatization of intermediate olefins. However, the effect of methanol dehydrogenation on aromatics formation over these catalysts is rarely studied. Here, we report that HCHO, which is formed by methanol dehydrogenation over Zn/H-ZSM-5 prepared by Zn impregnation, can participate in the synthesis of aromatics. Methanol conversion can produce more aromatics than olefins (propylene or ethylene) conversion over Zn/H-ZSM-5, indicating the conventional MTA pathway including methanol-to-olefins and olefins-to-aromatics is not complete. Moreover, an MTA mechanism including the conventional pathway and the methanol and HCHO coupling pathway is systematically proposed. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
引用
收藏
页码：174 / 178
页数：5
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