Benzene alkylation with methanol over phosphate modified hierarchical porous ZSM-5 with tailored acidity
Benzene alkylation with methanol over phosphate modified hierarchical porous ZSM-5 with tailored acidity
复制标题
在具有定制酸度的磷酸盐改性分级多孔 ZSM-5 上用甲醇对苯进行烷基化
DOI：
10.1016/j.cjche.2016.12.005
复制
发表时间：
2017-09-01
影响因子：
3.8
通讯作者：
Li, Xiaonian
中科院分区：
文献类型：
--
作者：
Lyu, Jinghui;Hu, Hualei;Li, Xiaonian
通过磷酸盐改性对分级多孔ZSM-5的酸度和酸分布进行了调整。结果表明，适量磷的存在提高了苯的转化率和甲苯、二甲苯的选择性。同时，甲醇制烯烃生成副产物乙苯、二甲苯异构化生成间二甲苯等副反应得到有效抑制。催化剂的酸强度和Bronsted酸位的数量对提高苯转化率和二甲苯收率至关重要，而外表面酸位的钝化对打破二甲苯异构体的热力学平衡分布起着重要作用。(C) 2017中国化学工业与工程学会，化学工业出版社。版权所有。
The acidity and acid distribution of hierarchical porous ZSM-5 were tailored via phosphate modification. The catalytic results showed that both benzene conversion and selectivity of toluene and xylene increased with the presence of appropriate amount of phosphorus. Meanwhile, side reactions such as methanol to olefins related with the formation of by-product ethylbenzene formation and isomerization of xylene to meta-xylene were suppressed efficiently. The acid strength and sites amount of Bronsted acid of the catalyst were crucial for improving benzene conversion and yield of xylene, whereas passivation of external surface acid sites played an important role in breaking thermodynamic equilibrium distribution of xylene isomers. (C) 2017 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.