双功能
沸石
催化作用
ZSM-5型
氧化物
金属
化学
无机化学
双功能催化剂
有机化学
作者
Yihua Yue,Jian Tian,Jiechao Ma,Shui Yang,Wen Li,Jiale Huang,Qingbiao Li,Guowu Zhan
标识
DOI:10.1016/j.apcatb.2024.124158
摘要
Herein, Ga-ZnZrOx&ZSM-5 bifunctional catalysts were designed for CO2 thermal hydrogenation to aromatics, particularly, aiming to enhance the selectivity of high-value BTX (i.e., benzene, toluene, and xylene). It was evident that the exterior surface properties and acidity of ZSM-5 can be effectively tailored by in-situ silicon deposition originating from the rice husk template. Catalytic performance assessments demonstrate an optimized catalyst achieving 88.1% aromatics selectivity (exclusive CO) in a single pass, with a notable 45.2% BTX selectivity within total aromatics and a low CO selectivity of 23.6%. This superior performance is attributed to the in-situ silicon deposition on ZSM-5 during one-pot synthesis and the optimized spacing between Ga-ZnZrOx and ZSM-5 facilitated by the rice husk platform. Furthermore, in-situ DRIFTS analysis identifies key reaction intermediates. This study offers an effective strategy for tuning zeolite acidity using rice husks, while modulating metal oxide-zeolite proximity on the bio-SiO2 platform, thus boosting CO2 conversion to aromatics.
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