Flexible regulation of C-3(=)/C-2(=) ratio in methanol-to-hydrocarbons by delicate control of acidity of ZSM-5 catalyst
Flexible regulation of C-3(=)/C-2(=) ratio in methanol-to-hydrocarbons by delicate control of acidity of ZSM-5 catalyst
复制标题
通过精细控制 ZSM-5 催化剂的酸度灵活调节甲醇与烃中的 C3=/C2= 比例
DOI：
10.1016/j.cclet.2017.03.023
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发表时间：
2017
影响因子：
9.1
通讯作者：
He Ming-Yuan
中科院分区：
文献类型：
--
作者：
Zhao Shu-Fang;Yao Xu-Ting;Yan Bing-Hui;Li Li;Liu Yue-Ming;He Ming-Yuan
在固定床反应器中，通过 ZSM-5 催化剂，可以在甲醇制烃工艺中实现从 0.72 到 7.56 的非常宽范围的 C3=/C2= 比率，以及约 66% 的高 C2=+ C3= 选择性。我们首先进行了酸度的单因素实验，证明MTH催化剂的酸度控制对于调节轻质烯烃选择性至关重要。弱布朗斯台德酸位点有利于高C3=选择性（59.0%），因为抑制了从烯烃基循环到芳烃基循环的转化反应，而路易斯酸位点有利于高C2=选择性（39.6%），因为促进了芳烃形成的转化反应，并且路易斯酸位点的空间限制使芳烃更有效地裂化为C2=。
A very wide range of the C3=/C2=ratio from 0.72 to 7.56 with high C2=+ C3=selectivity of around 66% in the methanol-to-hydrocarbons process can be realized over ZSM-5 catalyst in a fixed-bed reactor. We firstly conduct a single factor experiment of acidity, demonstrating that the acidity control of MTH catalyst is crucial to adjusting light olefins selectivity. Weak Brønsted acid sites favor to high C3=selectivity (59.0%) due to the suppression of the conversion reactions from the alkene-based to arene-based cycle, while Lewis acid sites conduce to high C2=selectivity (39.6%) due to the promotion of the conversion reactions for the aromatics formation and steric constraints of Lewis acid sites making the aromatics crack more efficiently to C2=.