Capsule-like zeolite catalyst fabricated by solvent-free strategy for para-Xylene formation from CO2 hydrogenation

• Published in: Applied catalysis. B, Environmental Environmental, 2022-04, Vol.303, p.120906, Article 120906
• Main Authors: Gao, Weizhe, Guo, Lisheng, Wu, Qinming, Wang, Chengwei, Guo, Xiaoyu, He, Yingluo, Zhang, Peipei, Yang, Guohui, Liu, Guangbo, Wu, Jinhu, Tsubaki, Noritatsu
• Format: Article
• Language: English
• Subjects: Aromatic compounds; Aromatics; Carbon dioxide; Catalysts; CO2 conversion; Direct conversion; HZSM-5 @Silicalite-1 core-shell zeolite; p-Xylene; Para-Xylene; Reagents; Silicalite; Silicon dioxide; Solvent-free synthesis; Solvents; Xylene; Zeolites
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2021.120906

An efficient Na-FeMn/HZSM-5@Silicalite-1 catalyst was rationally designed for direct conversion of CO2 to aromatics. The tailor-made HZSM-5@Silicalite-1 core-shell zeolite was prepared by a facile solvent-free method. The solvent-free synthesis of core-shell zeolite could not only address pollution issues by eliminating the large utilization of organic reagents, but also exhibit a better performance for separating para-Xylene (PX) from xylenes with the assistance of capsule-like zeolite oriented synthesis. For CO2 to aromatics reaction, Na-FeMn combining with capsule-like HZSM-5@Silicalite-1 catalyst could reach 81.1% PX/X (the C-mol ratio of PX to all xylenes) ratio, which was higher than those of conventional core-shell zeolites, such as HZSM-5@SiO2 and HZSM-5@Silicalite-1 core-shell zeolites which were obtained from traditional chemical liquid deposition and hydrothermal methods. The as-synthesized zeolite paves a new route for efficient conversion of CO2 molecules into valuable PX, and provides a facile method for regulating surface acid properties of zeolite. [Display omitted] •HZSM-5 @Silicalite-1 core-shell zeolite was prepared by a facile solvent-free method.•The external surface acid sites of HZSM-5 zeolite were completely covered by Silicalite-1 shell.•HZSM-5 @Silicalite-1 core-shell zeolite could enhance the PX selectivity in CO2 to aromatics reaction.•HZSM-5 @Silicalite-1 core-shell zeolite exhibited a high PX/X ratio as high as 81.1%.