Department of Applied Chemistry, Graduate School of Engineering, University of Toyama, Gofuku 3190, Toyama, 930-8555, Japan.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, P.R. China.
Chemistry. 2019 Apr 5;25(20):5149-5153. doi: 10.1002/chem.201806165. Epub 2019 Mar 19.
The oriented conversion of CO into target high-value chemicals is an effective way to reduce carbon emissions, but still presents a challenge. In this communication, we report the oriented conversion of CO into value-added aromatics, especially para-xylene, in a single pass by combining core-shell structured Zn-doped H-ZSM-5 (Zn-ZSM-5@SiO ) and a Cr O component. Through precise regulation of the acidity of Zn-ZSM-5@SiO , high para-xylene selectivity (38.7 % in the total products) at a CO conversion of 22.1 % was achieved. Furthermore, a CO -assisted effect in the synthesis of aromatics during the tandem process has been clarified through a control experiment. The CO reactant can act as a hydrogen acceptor to accelerate the dehydrogenation of alkenes, intermediates in the synthesis of aromatics, thereby increasing the driving force towards aromatics in the tandem reaction process.
将 CO 定向转化为目标高值化学品是减少碳排放的有效途径，但仍具有挑战性。在本通讯中，我们报告了通过将核壳结构的 Zn 掺杂 H-ZSM-5（Zn-ZSM-5@SiO ）和 Cr 2 O 3 组分相结合，在单次通过中将 CO 定向转化为附加值芳烃，特别是对二甲苯。通过精确调节 Zn-ZSM-5@SiO 2 的酸度，在 CO 转化率为 22.1%的情况下，实现了高达 38.7%的对二甲苯高选择性。此外，通过对照实验阐明了串联过程中 CO 在芳烃合成中的辅助作用。CO 反应物可以作为氢受体，加速烯烃的脱氢反应，即芳烃合成中的中间体，从而增加串联反应过程中芳烃的驱动力。
