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Synthesis of hierarchical ZSM-5 microspheres with superior performance for catalytic methanol-to-olefin conversion |
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| Authors: | Yali Zhang Kai Zhang Chao Shang Xiaoning Wang Lei Wu Guoqing Huang Hao Wang Qiming Sun Xiao Dong Chen Zhangxiong Wu |
| Affiliation: | 1. Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People's Republic of China
Contribution: Conceptualization (supporting), Data curation (lead), Formal analysis (lead), Investigation (lead), Writing - original draft (lead);2. Innovation Center for Chemical Sciences, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People's Republic of China Contribution: Data curation (supporting), Formal analysis (supporting), Investigation (supporting), Methodology (supporting);3. Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People's Republic of China Contribution: Formal analysis (supporting), Investigation (supporting), Methodology (supporting);4. Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People's Republic of China Contribution: Investigation (supporting), Resources (supporting), Writing - review & editing (supporting);5. Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People's Republic of China Contribution: Investigation (supporting), Methodology (supporting);6. Innovation Center for Chemical Sciences, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People's Republic of China Contribution: Data curation (supporting), Investigation (supporting), Methodology (supporting), Supervision (supporting), Writing - review & editing (supporting);7. Particle Engineering Laboratory, School of Chemical and Environmental Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, People's Republic of China |
| Abstract: | Methanol-to-olefin (MTO) conversion on zeolites has encountered severe coke deposition and rapid deactivation. Creating different levels of porosity is essential to mitigate such issues. Herein, we demonstrate a facile and green strategy to synthesize uniform and hierarchically macro/mesoporous ZSM-5 microspheres by combining spray-freeze drying and steaming-assisted crystallization (SAC). The structure, crystallinity, and porosity of the zeolite microspheres are controlled by adjusting the water/gel mass ratio and time in the SAC process. The structure evolution during the SAC process is revealed. In the catalytic MTO reaction, the representative hierarchically porous ZSM-5 catalyst exhibits superior catalytic performance. At a very high weight hourly space velocity of 18 h−1, it shows a dramatically prolonged lifetime (47 h at >99% conversion) and much-improved selectivity to ethylene and propylene compared with the conventional microporous ZSM-5 and nano-sized ZSM-5. The enhanced performance is originated from the hierarchical structure and suitable acidity of the ZSM-5 microspheres. |
| Keywords: | hierarchical zeolite methanol-to-olefin conversion particle technology steam-assisted crystallization ZSM-5 |