生物基呋喃催化热解耦合CO_(2)还原制取芳烃和合成气

Catalytic Pyrolysis of Bio-Based Furan Coupled with CO_(2)Reduction to Produce Aromatics and Syngas

针对生物基呋喃单独芳构化过程中通常伴随着脱氢反应,并且考虑到CO_(2)单独还原成CO需要消耗大量H_(2),提出一种生物基呋喃催化热解耦合CO_(2)还原定向制取碳负性芳烃和合成气新工艺。通过构筑分子筛负载的复合金属催化剂来同步实现2-甲基呋喃(2-MF)的高效芳构化和CO_(2)的活化。研究表明,HZSM-5负载Mo-Ni可以显著提高CO_(2)的转化率以及气体产物中合成气的选择性,分别从−4.56%(CO_(2)生成速率大于其转化速率)和46.78%大幅提高至24.68%和72.28%,这归因于双金属的配位结构引入了更多氧空位,同时通过引入路易斯酸位点有效提高了催化剂的芳构化能力。研究结果可为生物质催化热解新工艺发展和催化剂设计提供理论指导。

In view of the fact that the individual aromatization process of bio-based furan is usually accompanied by dehydrogenation reaction,and considering that the individual reduction of CO_(2)to CO requires a lot of hydrogen,this paper proposes a new process for the targeted production of carbon-negative aromatics and syngas by catalytic pyrolysis of bio-based furan coupled with CO_(2)reduction.Efficient aromatization of 2-methylfuran(2-MF)and activation of CO_(2)were simultaneously achieved by constructing composite metal catalysts supported on molecular sieves.It is found that Mo-Ni supported on HZSM-5 can significantly improve the conversion of CO_(2)and the selectivity of syngas in gas products,from−4.56%(CO_(2)generation rate is higher than its conversion rate)and 46.78%to 24.68%and 72.28%,respectively,which is attributed to the introduction of more oxygen vacancies by the coordination structure of bimetals.Meanwhile,the catalyst can enhance its aromatization ability by introducing Lewis acid sites.The research findings provide theoretical guidance for developing new technology and catalyst design for biomass catalytic pyrolysis.